This thesis describes the development and production of numerical simulations of the creation of a Hot Dry Rock (HDR) geothermal reservoir. This geothermal reservoir that was simulated is owned by Geodynamics Limited and is located in the Cooper Basin, South Australia. The simulations show the geometry of the geothermal reservoir and predict the productive lifespan of the reservoir. Geothermal energy, which is the thermal energy that is stored in the interior of the earth, is an enormous energy source and as such there is great interest in technology that allows this energy to be harnessed. The HDR process of extracting the geothermal energy from rock involves drilling a borehole to a suitable depth and injecting cold water into the rock via this well (known as the injection well) to create a reservoir by opening up fractures in the rock. As water is forced through the reservoir, heat is extracted from the rock via conduction and transferred to the water, creating an heat exchange. Warm water is brought to the surface via another well known as the extraction well. The heat from the water is used to generate electricity and then the water is fed back into the injection well, completing the cycle. The creation of a HDR geothermal reservoir comprises of many aspects: the injection of the fluid into the jointed rock system, the opening and shearing of the joints, the creation of the fluid reservoir in the rock and the temperature effects of the fluid flow through the joints. This work incorporates all of these aspects. Due to the multi-physics nature of this process multiple computational modelling strategies were implemented to allow for authentic simulation of the entire process. The mechanical rock behaviour was primarily simulated the Distinct Element Method. This two dimensional Distinct Element Method program allowed for a realistically scaled model of the whole geothermal reservoir to be developed. This model was particularly useful for modelling the joint behaviour as the discrete nature of this method compares well with the joint system on such a scale. A discrete particle based model was used to model the joint behaviour on a small scale. These models demonstrated the behaviour of joints under compressional strain, showing slip and the effects of joint dilatancy. The productive lifespan of the geothermal reservoir was modelled using a Finite Element Method program based on Darcy's Law and an height-averaged heat equation. The aim of this model was to simulate the effects on the rock temperature of the fluid flow through the reservoir. The lifespan of the reservoir with differing well geometries was tested using this model to show which geometry would extend the productive lifetime of the geothermal reservoir. The results produced from the DEM models showed that the reservoir geometry is very much dependent upon the joint angle, and under the Cooper Basin stress regime steeper joints will be more likely to open. Joint dilatancy also affects the fluid flow rates as the amount of joint opening is dependent upon the joint dilatancy angle. The modelling of the temperature drawdown of the rock due to the fluid flow showed that a square configuration of wells is the ideal configuration to prolong the productive lifespan of the HDR geothermal reservoir. Results produced with the modelling parameters provided by Geodynamics Limited indicate that the productive lifespan of the Cooper Basin HDR geothermal reservoir created is approximately 50 years. This reservoir is only one of many that can be created at the site to prolong the productivity of the energy plant. The combined results of this modelling strategy give an overall image of the creation and lifetime of the HDR geothermal energy plant in the Cooper Basin.

This thesis describes the development and production of numerical simulations of the creation of a Hot Dry Rock (HDR) geothermal reservoir. This geothermal reservoir that was simulated is owned by Geodynamics Limited and is located in the Cooper Basin, South Australia. The simulations show the geometry of the geothermal reservoir and predict the productive lifespan of the reservoir. Geothermal energy, which is the thermal energy that is stored in the interior of the earth, is an enormous energy source and as such there is great interest in technology that allows this energy to be harnessed. The HDR process of extracting the geothermal energy from rock involves drilling a borehole to a suitable depth and injecting cold water into the rock via this well (known as the injection well) to create a reservoir by opening up fractures in the rock. As water is forced through the reservoir, heat is extracted from the rock via conduction and transferred to the water, creating an heat exchange. Warm water is brought to the surface via another well known as the extraction well. The heat from the water is used to generate electricity and then the water is fed back into the injection well, completing the cycle. The creation of a HDR geothermal reservoir comprises of many aspects: the injection of the fluid into the jointed rock system, the opening and shearing of the joints, the creation of the fluid reservoir in the rock and the temperature effects of the fluid flow through the joints. This work incorporates all of these aspects. Due to the multi-physics nature of this process multiple computational modelling strategies were implemented to allow for authentic simulation of the entire process. The mechanical rock behaviour was primarily simulated the Distinct Element Method. This two dimensional Distinct Element Method program allowed for a realistically scaled model of the whole geothermal reservoir to be developed. This model was particularly useful for modelling the joint behaviour as the discrete nature of this method compares well with the joint system on such a scale. A discrete particle based model was used to model the joint behaviour on a small scale. These models demonstrated the behaviour of joints under compressional strain, showing slip and the effects of joint dilatancy. The productive lifespan of the geothermal reservoir was modelled using a Finite Element Method program based on Darcy's Law and an height-averaged heat equation. The aim of this model was to simulate the effects on the rock temperature of the fluid flow through the reservoir. The lifespan of the reservoir with differing well geometries was tested using this model to show which geometry would extend the productive lifetime of the geothermal reservoir. The results produced from the DEM models showed that the reservoir geometry is very much dependent upon the joint angle, and under the Cooper Basin stress regime steeper joints will be more likely to open. Joint dilatancy also affects the fluid flow rates as the amount of joint opening is dependent upon the joint dilatancy angle. The modelling of the temperature drawdown of the rock due to the fluid flow showed that a square configuration of wells is the ideal configuration to prolong the productive lifespan of the HDR geothermal reservoir. Results produced with the modelling parameters provided by Geodynamics Limited indicate that the productive lifespan of the Cooper Basin HDR geothermal reservoir created is approximately 50 years. This reservoir is only one of many that can be created at the site to prolong the productivity of the energy plant. The combined results of this modelling strategy give an overall image of the creation and lifetime of the HDR geothermal energy plant in the Cooper Basin.

Esse trabalho trata do problema de interação dinâmica entre veículos de carga e estruturas de pontes rodoviárias, incluindo o aprimoramento de um modelo veicular de oito graus de liberdade usualmente utilizado na modelagem de veículos classe 3C, introduzindo o nono grau de liberdade, referente à rotação em torno de seu eixo longitudinal ou movimento roll. Foram calculados os carregamentos provenientes do veículo modelado sobre pavimento inicialmente indeslocável, com perfis iguais ou distintos de rugosidade e diferentes sob cada linha de pneus, assim como a participação da energia modal do veículo para cada caso. Tais carregamentos foram condensados estaticamente e aplicados em modelo estrutural simplificado (unifilar) de uma ponte em seção celular, visando a identificar as flutuações dos esforços de torção provenientes da diferença de perfil de rugosidade sob cada linha de pneus do veículo estudado. Ainda foram confrontados resultados para duas situações de tráfego, sendo a primeira para veículo isolado trafegando sobre estrutura e a segunda para um comboio de veículos. Também, verificou a aproximação implícita na adoção de pavimento indeslocável para a obtenção dos esforços da interação veículo-pavimento, utilizando um método iterativo até que se garantisse convergência para os deslocamentos. / This work is concerned with the problem of dynamic interaction between heavy vehicles and bridges structures and also with the improvement of an eight-degree-of-freedom model of a 3C class vehicle, by introducing the ninth degree of freedom referring to the rotation about the vehicle longitudinal axis, or roll movement. The loads applied by the vehicle to the bridge deck were evaluated, assuming initially a rigid structure under the pavement, for both equal and distinct roughness profiles under each tire line, as well as the vehicle modal energy participation for each case. Such loads were statically condensed and applied to a simplified (unifilar) structural model of a girder box bridge, aiming at estimating the fluctuation of the torsion moments due to the differences in the roughness profiles under each tire line. The differences in the dynamic response were evaluated considering two traffic situations, namely a single vehicle or an ensemble of vehicles moving along the bridge. It was further checked the approximation implied in the assumption of a rigid structure under the pavement for the evaluation of the vehicle-structure interaction loads, by means of an iterative procedure until convergence was obtained for the displacements. Besides, it was compared the dynamic responses considering two different traffic situations. The first situation is a unique vehicle moving on a bridge whereas the second is a train of vehicle moving on the bridge. Ahead, it was verified the error in adopt the hypothesis of unmoved pavement in the vehicles model to obtain iteration forces pavement-vehicle, using an iterative methodology to rebuild the original vehicles displacement.

Arbetet är en studie av befintliga system för att skapa underlag för förbättring i kommunikationen mellan projektering och produktion i byggbranschen. Sex olika arbetssätt valdes ut för att undersökas hur fördelaktiga dom är i praktiken. Delaktighet, återkoppling, PM vid revidering, specifikation, tekniska hjälpmedel- och konstruktör på byggarbetsplats, var dom delar som studien skulle undersöka. Hur används dom idag, hur kan dom integreras samt hur gynnsamma är dom, var frågeställningar som skulle besvaras. Med hjälp av kunskaper från utbildningen, studier och arbetsmetoder som tidigare använts samt en fallstudie har frågeställningarna kunnat besvaras. För att få ett välgrundat och pålitligt resultat har flera olika yrkeskategorier samt aktörer i branschen använts i förarbetena. Även valet av handledande företag valdes ut med samma villkor. Slutsatsen av studien blev att dom sex punkterna går att integrera samt att vissa redan delvis är beprövade. Genom att förbättra en punkt ger det till följd att flera punkter förbättras samtidigt. Därför vill vi i slutändan framföra vikten av att lägga tid och fokus på att integrera delarna i projekten. / The thesis work is a study of existing systems to provide a basis for improvement in communication between construction planning and production in the construction industry. Six different ways of working were chosen to investigate how beneficial they actually are. Participation, feedback, PM at revision, specification, technical assistant- and constructor planer at the construction site, were the six ways of working on which the study was based. How are they used today, how can they be integrated and how beneficial they are, were questions that will be answered in this study. With the help of knowledge from the education, studies and different working methods used previously, as well as a case study, the questions have been answered. In order to have a wellfounded and reliable result, several different professions and coworkers in the industry have been used in the preliminary work. The choice of supervisory companies was also chosen under the same conditions. The conclusion of the study was that the six working methods could be integrated and that some were already partially tested. By improving a method, several others will be improved at the same time. Therefore, in the end, we want to emphasize the importance of placing time and focus on integrating the methodes in this project

This is a critical and comparative study that examines the blossoming and maturation of the Sesotho sa Leboa (Northern Sotho) Young Adult (YA) novella from the canon of novels in that language. The periods under examination are divided into three decades, namely, 1940–1949, 1950-1959 and 1960-1969. Taking into account the significant research done by scholars in Sesotho sa Leboa, very little is known about YA literature and in particular, the Young Adult novella (novelette or novel). This somewhat confusing sub-genre is clarified and dissected by literary theorists from different orientations and traditions (schools of thought). It is envisaged that this research work will help language practitioners in Sesotho sa Leboa, and other languages to make informed decisions about the classification of the sub-genre in terms of its literary elements. Defining the age cohort of the young adult has also been, and still is, a hotly debated terrain. Arguably, the problem stems from diverse societies trying to provide a uniform definition of a global community. In many instances, the age definition of ‘who is the young adult’ seems to be more complex and political in nature. In the final analysis, the study provides guidelines for the literary evaluation of texts for use in secondary schools, tertiary institutions and for the selection of books for libraries. Novice writers, in comparison with their predecessors, will also become more conversant with the requirements of the sub-genre. For this reason, Sesotho sa Leboa literature will continue to grow and develop in all facets in relation to quality, insight and world view. / Afrikaans: Hierdie is 'n kritiese en vergelykende studie wat die bloei en volwassenheid van die Sesotho sa Leboa (Noord-Sotho) jong volwassene (YA) novelle vanuit die kanon van romans in daardie taal ondersoek. Die periodes wat ondersoek word, word in drie dekades verdeel, naamlik 1940–1949, 1950-1959 en 1960-1969. Met inagneming van die beduidende navorsing wat wetenskaplikes in Sesotho sa Leboa gedoen het, is daar baie min bekend oor jong volwassene-literatuur en veral die novelle van jong volwassene romans. Hierdie ietwat verwarrende subgenre word deur literêre teoretici uit verskillende oriëntasies en tradisies (denkrigtings) verhelder en gedissekteer. Daar word voorsien dat hierdie navorsingswerk taalpraktisyns in Sesotho sa Leboa en ander tale sal help om ingeligte besluite te neem oor die klassifikasie van die subgenre in terme van die literêre elemente daarvan. Die definisie van die ouderdomsgroep van die jong volwassene was, en is nog steeds, 'n baie gedebatteerde terrein. Die probleem spruit waarskynlik uit uiteenlopende samelewings wat probeer om 'n eenvormige definisie van 'n wêreldgemeenskap te gee. In baie gevalle,lyk die definisie van 'wie die jong volwassene' is, meer kompleks en polities van aard. Uiteindelik bied die studie riglyne vir die literêre evaluering van tekste wat gebruik kan word in sekondêre skole, tersiêre instellings en vir die keuse van boeke vir biblioteke. Beginnersskrywers, in vergelyking met hul voorgangers, sal ook meer vertroud raak met die vereistes van die subgenre. Om hierdie rede sal die literatuur van Sesotho sa Leboa aanhou groei en ontwikkel in alle fasette in verhouding tot kwaliteit, insig en wêreldbeskouing. / Thesis (DLitt)--University of Pretoria, 2020. / African Languages / DLitt / Unrestricted

The objective of this master’s thesis is to evaluate the use of Bonded Block Modelling (BBM) in 3DEC software combined with hybrid rock bolts, for three different cases. These cases included the laboratory rock bolt case, the shearing case and the blocky rock mass case. 3DEC is a Distinct Element Method (DEM) numerical software which can be used to simulate both continuum and discontinuum media in 3D. The Bonded Block Model in 3DEC can be used to simulate a rock mass as bonded polyhedral elements. The BBM is a relatively new numerical modelling technique. Earlier studies have focused mainly on laboratory test cases and less on field scale studies. The laboratory rock bolt test was introduced by Hoek and the main idea was to describe the way that rock bolts work. Four different rock bolt spacing designs were simulated and one unsupported model, in order to validate Hoek’s results. The diameter of the blocks was 15 cm while the zones were modelled with length of 5 cm. The tunnel on the shearing case was excavated at the depth of 1500 m. For the stress field, the in-situ stresses of Kiirunavaara mine were considered. The tunnel on the blocky case was excavated at the depth of 30 m and a gravitational stress field was assumed. The shearing model as well as the blocky model, were simulated on a quasi-3D model. The zone length for both cases was 0.1 m. In both cases, a discontinuum non-BBM was modelled first and then, a discontinuum BBM with different rock UCS values was simulated. The discontinuum BBM on the shearing case was simulated for rock UCS of 200, 100, and 50 MPa, while on the blocky case, it was simulated for rock UCS of 50 MPa. The Mohr – Coulomb constitutive model was selected for all three modelling cases. The conclusions of this work were the following: –       The laboratory rock bolt model validated the results of Hoek. Hoek suggested that rock bolt spacing less than three times the average rock piece diameter would be sufficient to produce positive results. The stabilization of the rock pieces as well as the forming of the compression zone were achieved when this equation was satisfied. The geometry of the stabilized material as well as the compression zone, were also correct. –       The discontinuum BBM on the shearing case with intact rock UCS of 200 MPa, produced similar results as the discontinuum non-BBM. This indicates that BBM can be applied for these cases and produce reliable results. The displacement of the fault was expected to be higher than the resulting values. The discontinuum BBM with reduced rock strength (100 MPa and 50 MPa) resulted in rock mass fragmentation. However, the fragmented rock pieces did not detach from the rock mass as the displacement values were not high enough.   –       The discontinuum BBM on the blocky case with intact rock UCS of 50 MPa, produced similar results as the discontinuum non-BBM. There were two discontinuities that affected the smooth transition of the displacement/stress results on the different blocks. The fragmentation of the rock mass due to the existence of the discontinuities did not produce any further rock mass movements.   –       The interaction between rock mass and rock bolts was evident in any modelling case. For the laboratory rock bolt model, the hybrid bolts design was vital for producing correct results. For the shearing model, the hybrid bolts were subjected to shearing movements due to fault movements. In the blocky model, the bolts in the roof of the tunnel were subjected to axial displacements, due to the existence of blocks. The recommendations for further work were the following: –       The hybrid bolts in the laboratory rock bolt test were pretensioned only in the beginning of the computation phase. In reality, the tensioned bolts act at every moment and not only in the beginning. However, it would be interesting to see if the results are similar with continuously tensioned hybrid bolts. It is anticipated that the constantly tensioned hybrid bolts should be able to keep the compressive zones with high values throughout the whole cycling process. Thus, it is suggested for future modellers that this case could be modelled with continuously tensioned hybrid bolts. –       The installation of rock bolts in the shear case as well as in the blocky case, was at the exact same time as the tunnel was excavated.  This is not realistic fact because it is impossible to install the rock bolts exactly the same time as the tunnel excavated. Thus, it is suggested that those two cases could be modelled in the future with more focus on the stress relaxation factor.

The equivalent continuum approach uses equivalent propertiesof rock mass as the input data for a continuum analysis. Thisis a common modeling method used in the field of rock mechanicsand hydrogeology. However, there are still unresolvedquestions; how can the equivalent properties be determined andis the equivalent continuum approach suitable for modeling thediscontinuous fractured rock mass. The purpose of this paper is to establish a methodology todetermine the equivalent hydraulic and mechanical properties offractured rock masses by explicit representations of stochasticfracture systems, to investigate the scale-dependency of theproperties, and to investigate the conditions for theapplication of the equivalent continuum approach for thefractured rock masses. Geological data used for this study arefrom the site characterization of Sellafield, Cumbria, UK. Aprogram for the generation of stochastic Discrete FractureNetwork (DFN) is developed for the realization of fractureinformation and ten parent DFN models are constructed based onthe location, trace length, orientation and density offractures. Square models with the sizes varying from 0.25 m× 0.25 m to 10 m × 10 m are cut from the center ofthe each parent network to be used for the scale dependencyinvestigation. A series of the models in a parent network arerotated in 30 degrees interval to be used for investigation oftensor characteristic. The twodimensional distinct elementprogram, UDEC, was used to calculate the equivalentpermeability and compliance tensors based on generalizedDarcy’s law and general theory of anisotropic elasticity.Two criteria for the applicability of equivalent continuumapproach were established from the investigation: i) theexistence of properly defined REV (Representative ElementaryVolume) and ii) existence of the tensor in describing theconstitutive equation of fractured rock The equivalentcontinuum assumption cannot be accepted if any one of the abovetwo criteria is not met. Coefficient of variation and meanprediction error is suggested for the measures toquantitatively evaluate the errors involved in scale dependencyand tensor characteristic evaluation. Equivalent permeability and mechanical properties (includingelastic modulus and Poisson’s ratios) determined onrealistic fracture network show that the presence of fracturehas a significant effect on the equivalent properties. Theresults of permeability, elastic moduli and Poisson's ratioshow that they narrow down with the increase of scale andmaintain constant range after a certain scales with someacceptable variation. Furthermore, Investigations of thepermeability tensor and compliance tensor in the rotated modelshow that their tensor characteristics are satisfied at acertain scale; this would indicate that the uses of theequivalent continuum approach is justified for the siteconsidered in this study. The unique feature of the thesis is that it gives asystematic treatment of the homogenization and upscaling issuesfor the hydraulic and mechanical properties of fractured rockswith a unified approach. These developments established a firmfoundation for future application to large-scale performanceassessment of underground nuclear waste repository byequivalent continuum analysis. <b>Keywords :</b>Equivalent continuum approach, Equivalentproperty, Representative Elementary Volume (REV), DistinctElement Method, Discrete Fracture Network (DFN) / NR 20140805

AbstractBakgrunden till föreliggande studie är att skolutveckling är ett område som ofta prioriteras bort för specialpedagoger framför andra specialpedagogiska arbetsuppgifter som undervisning enskilt eller i grupp, dokumentation eller andra administrativa arbetsuppgifter. Detta gjorde mig intresserad av att undersöka hur specialpedagogens kunskaper kommer till användning inom skolutveckling. Syftet med föreliggande studie är således att undersöka hur specialpedagogens kunskap och kompetens inom skolutveckling kommer till användning i skolans verksamhet. Studien syftar även till att belysa vad som är betydelsefullt för framgångsrik skolutveckling i skolans organisation. Studiens frågeställningar är:•Hur arbetar specialpedagoger med skolutveckling?•Vad möjliggör och begränsar specialpedagogers arbete med skolutveckling?•Vad är betydelsefullt i organisationen för att lyckas med skolutveckling?Föreliggande studie bygger den empiriska delen på underlag ifrån fyra grundskolor i tre kommuner. Respondenterna som inkluderades i studien är fyra rektorer som har gått rektorsprogrammet och fyra utbildade specialpedagoger. En rektor och en specialpedagog intervjuades från varje organisation. Rektor och specialpedagog skulle även ha arbetat tillsammans i mer än sex månader, för att ha haft möjlighet och kunnat påbörja utvecklandet av en organisation för skolutveckling. En kvalitativ metod har använts med semistrukturerade intervjuer för att på ett naturligt sätt kunna ställa följdfrågor till respondenterna. För att bearbeta och analysera det insamlade materialet användes en kvalitativ innehållsanalys, för att kunna analyser intervjuerna med fokus på likheter och skillnader. Resultatet visar att arbetet med skolutveckling är ett arbetsområde som är svårt för specialpedagogerna att nå framgång i och specialpedagogerna får inte mandat till att arbeta med skolutveckling. Resultatet påvisar även för att det ska bli en framgångsrik organisation och för att lyckas med skolutveckling är det betydelsefullt med en tydlig ledning som organiserar och strukturerar arbetet med skolutveckling. Studien ger en inblick i hur viktigt specialpedagogers eget engagemang och med egen kraft hävda sin yrkesroll för att få mandat och legitimitet att utföra de arbetsuppgifter som specialpedagogutbildningen motsvarar. Studien bidrar även med kunskap om vad som är betydelsefullt för att lyckas med skolutveckling, i framgångsrika organisationer är det viktigt hur den interna organisationen är organiserad och det är avgörande med en kompetent och engagerad rektor som organiserar och strukturerar det pedagogiska ledarskapet som främjar en lärande och en samarbetande kultur i riktning mot kunskapskraven. Studiens kunskapsbidrag är värdefullt för nyutexaminerade specialpedagoger, verksamma specialpedagoger, rektorer samt skolledare. / AbstractThe background to the present study is that school development is an area, which is often neglected for special educators in favor of other job assignments, such as teaching, individually or in groups, documentation, or other administrative work tasks. This made me interested in examining how the knowledge of special educators is taken into consideration within school development. Therefore, the aim of the present study is to examine how special educators’ knowledge and competence regarding school development is utilized within schools. In addition, the aim is to illuminate relevant aspects of successful school development within the school organization. The problem statements of the study are:•In what ways are special educators working with school development?•What facilitates as well as limits the school development work of special educators?•Which organizational aspects are important for a successful school development?The empirical data of the present study comes from four compulsory schools in three municipalities. Respondents in the study are four principals, who previously have participated in the school leadership program, and four qualified special educators. An inclusion criteria for the respondents was that one principal and one special educator had worked together for at least six months in order to have started a collaboration in developing an organization for school development. A qualitative design was chosen, using individual semi-structured interviews, which allow for follow-up questions. A qualitative content analysis was chosen, which focuses on differences and similarities in the data. Findings show that school development is an area which is difficult for special educators to succeed in, and that they are not given the mandate to work with school development. Findings also indicate that in order to be a successful organization that ensure school development, it is important to have a distinct management that organizes and structures the work regarding school development. This study highlights the importance of special educators’ being participating as well as claiming the value of their profession in order to obtain the mandate and the legitimacy to perform the work tasks that their education has prepared them for. In addition, the study contributes with knowledge regarding important factors in successful school development: in successful organizations it is important how the internal organization is organized. A decisive element is having a competent and committed principal who organizes and structures a pedagogical leadership, promoting a culture characterized by learning and cooperation in relation to the knowledge requirements. This study contributes with valuable knowledge to recently graduated special educators as well as already active special educators, principals, and school managers.

No description available.

Die Rotliegend-Vulkanite aus dem Norddeutschen Becken (NDB) sind in jüngster Zeit stärker in den Fokus geothermischer Betrachtung gerückt. Ein wichtiger Meilenstein war das Forschungsprojekt Groß Schönebeck, bei dem wider Erwarten die Vulkanite als sekundärer Zielhorizont die besten Voraussetzungen für eine geothermische Erschließung boten. Über die hydraulisch/mechanischen Eigenschaften der Vulkanite im Untergrund ist jedoch kaum etwas bekannt und auch die Oberflächenäquivalente sind hinsichtlich geothermisch relevanter Parameter weitgehend unerforscht. Aus den positiven Erfahrungen des Standorts Schönebeck entstand die Motivation einer umfangreichen Analyse der Rotliegend-Vulkanite mit Blick auf eine tiefengeothermische Nutzung. Es wurden thermische, felsmechanische und petrophysikalische Untersuchungen von sieben Oberflächenäquivalenten durchgeführt; drei der Oberflächengesteine sowie zwei Tiefenbohrungen wurden ferner hinsichtlich auftretender Kluftmuster analysiert. Die Daten fungieren als Eingangsparameter für hydraulische sowie hydromechanische numerische Modellierungen zur Potenzialabschätzung und zum Prozessverständnis. Die thermische Analyse der Gesteine ergab eine hohe Wärmeleitfähigkeit für die quarzreichen und dichten Vulkanitvarietäten. Durch die Wärmekapazität und die Reservoirtemperatur wurde das technische Strompotenzial für die Eruptionsstadien ermittelt. Das größte Potenzial liegt im explosiven Ignimbritstadium und im Post-Ignimbritstadium und wird auf einen Wert geschätzt, der allein dem 20-fachen des deutschen Jahresstromverbrauchs entspricht. Regional betrachtet ist das größte Potenzial bei Standortwahl im zentralen östlichen NDB zu erwarten. Die untersuchten Vulkanite sind überwiegend dicht und erfordern Stimulationsmaßnahmen für eine erfolgreiche Erschließung. Auch die stärker porösen Tuffe erreichen nicht die erforderliche Matrixpermeabilität für einen Porenleiter. Triaxiale Druckversuche unter in-situ Spannungsbedingungen haben jedoch gezeigt, dass es nur bedingt möglich ist, Risse im intakten Gestein zu erzeugen. Man ist folglich auf eine gestörte Kruste, also Klüfte im Gestein angewiesen. Sowohl die Oberflächengesteine als auch die Vulkanite im Untergrund sind nachweislich geklüftet. Das tektonische Grundmuster beschreibt Klüfte, die NW-SE bis NNW-SSE sowie NE-SW bis NNE-SSW orientiert sind und dabei steil einfallen. Die Scherfestigkeitskriterien der Kluftflächen liegen deutlich unterhalb derer für das intakte Gestein, so dass die Bedingung für eine Aktivierung der Klüfte im Spannungsfeld des NDB positiv bewertet wird. Die Kluftdaten wurden zum Zwecke numerischer Modellierungen in diskrete Kluftnetzwerkmodelle überführt. Hydraulische Modellierungen ergaben eine bevorzugte Fließrichtung in NW-SE. Die mit der Tiefe zunehmende Kluftschließung führt zu einer Durchlässigkeit, die für eine geothermische Nutzung nicht ausreichend ist, das Gestein muss hydraulisch stimuliert werden. Eine Stimulation der Kluftflächen zur Steigerung der Fließrate wurde mittels hydromechanischer Modellierungen erfolgreich dargestellt. Die wichtigsten Kriterien für eine erfolgreiche Stimulation sind die Geometrie des Kluftsystems und die Orientierung des Spannungsfelds. Aufgrund der überwiegend vertikalen Kluftflächen im Vulkanit und der hohen Vertikalspannung im tiefengeothermischen Reservoir wird eine Erschließung über das Multiriss-Konzept empfohlen. Durch den in der vorliegenden Arbeit dargestellten methodischen Ansatz kann mittels repräsentativer Eingangsparameter für einen Standort entsprechend der notwendige Injektionsdruck sowie die Art und Intensität der Verformung der Kluftflächen für eine hydraulische Stimulation prognostiziert werden.