[pt] A avaliação da estabilidade de taludes naturais em solos residuais envolve, em muitos casos, um considerável grau de incerteza devido a dificuldade em estimar ou conhecer as pressões neutras atuantes no talude. Muitas das incertezas consiste na determinação dos parâmetros de resistência para os solos envolvidos. Este trabalho consiste na estimativa das pressões neutras através de retro-análises de casos históricos brasileiros. Para isto, estudou-se o mecanismo de instabilização que causa a rotura do talude apenas pela perda total ou parcial da sucção, causada pela infiltração da água de chuva. Apresenta-se um breve relato sobre as metodologias de ensaios, bem como parâmetros de resistência ao cisalhamento em solos residuais. É feito um estudo sobre a sucção em solos, dando ênfase a relação sucção - umidade. Para realização das retro-análises foram escolhidos 7 casos históricos, devido a existência de informações sobre superfícies de rotura e parâmetros de resistência de boa qualidade. As retro-análises foram realizadas utilizando-se a envoltória de resistência proposta por Fredlund et alii (1978) para solos parcialmente saturados e a envoltória convencional para solos saturados. O método de Bishop simplificado é empregado para superfície de deslizamento circular, o método de Janbu simplificado para superfície não circular e o método teórico de talude infinito para superfície de rotura paralela a superfície do terreno. Em 4 dos casos históricos, encontrou-se a pressão neutra média mobilizada negativa, mostrando que a instabilidade pode estar associada apenas a redução da sucção. Em outros 2 casos, encontrou-se a pressão neutra média ligeiramente positiva e nos 3 últimos casos analisados, positiva. No estudo, é realizada uma investigação do efeito da distribuição da pressão neutra com a profundidade na análise de estabilidade. Os resultados não alteram a principal conclusão do estudo, isto é, a rotura nestes casos históricos pode estar associada a redução da sucção ou a baixos valores da pressão neutra. / [en] The evaluation of stability of natural slopes in residual soils involves in many cases a considerable degree of uncertainly due to the difficulty of estimating or knowing the pore pressure operating in the slope. Much less uncertainly however existis in determining the effective strength parameters for the soils involved. This work deals with the evaluation of pore pressures through back-analysis of brazilian case histories. In order to do partial loss of suction that are caused bu the infiltration of rain water. A report on the tests conducted in the laboratory is presented as well as a survey on shear strength parameters of residual soils. A study on suction in soils is also presented with enphasis in the relationship moisture- suction. Seven case histories were chosen in order to carry out the back-analysis. In these cases there was available and reliable information on the geometry of the failure surface and shear strength parameters. The strength envelope proposed by Fredlund et all (1978) for partially saturated soils and conventional strength envelope for saturated soils were used in the analysis. The simplified Bishops method was used for circular failure surfaces while Jambus simplified method was used for non-circular surfaces parallel to the slope surface. In four of the case histories analysed, negative mobilized pore pressures were found showing that the intability could be associated only to the reduction in suction. In two other cases the average pore pressure were slightly positive while in the last three cases, positive. A study has been carried out to investigate the possible effect of pore pressure distribution with depth on the stability analysis. The results did not alter the main conclusion of the study, i.e., at failure in these case histories pore suctions of low pore water pressures were generally operating.

No description available.

Reservoir release patterns are determined by a number of purposes, the most fundamental of which is to manage water resources for human use. Managing our water resources means not only controlling the water in reservoirs but also determining the optimum release rate taking into account factors such as reservoir stability, power generation, water supply for domestic, industrial, and agricultural uses, and the river ecosystem. However, riverbank stability has generally not been considered as a factor, even though release rates may have a significant effect on downstream riverbank stability. Riverbank retreat not only impacts land properties but also damages structures along the river such as roads, bridges and even buildings. Thus, reservoir releases need to also take into account the downstream riverbank stability and erosion issues. The study presented here investigates the riverbank stability and erosion at five study sites representing straight as well as inside and outside channel meander bends located on the lower Roanoke River near Scotland Neck, North Carolina. Extensive laboratory and field experiments were performed to define the hydraulic and geotechnical properties of the riverbank soils at each site. Specifically, soil water characteristic curves were determined using six different techniques and the results compared to existing mathematical models. Hydraulic conductivity was estimated using both laboratory and in situ tests. Due to the wide range of experimentally obtained values, the values determined by each of the methods was used for transient seepage modeling and the modeling results compared to the actual ground water table measured in the field. The results indicate that although the hydraulic conductivities determined by in situ tests were much larger than those typically reported for the soils by lab tests, numerical predictions of the ground water table using the in situ values provided a good fit for the measured ground water table elevation. Shear strengths of unsaturated soils were determined using multistage suction controlled direct shear tests. The test method was validated, and saturated and unsaturated shear strength parameters determined. These parameters, which were determined on the basis of results from both laboratory and field measurements, and the associated boundary conditions, which took into account representative flow rates and patterns including peaking, drawdown and step-down scenarios, were then utilized for transient seepage analyses and slope stability analyses performed using SLIDE, a software package developed by Rocscience. The analyses confirmed that the riverbanks are stable for all flow conditions, although the presence of lower permeability soils in some areas may create excess pore water pressures, especially during drawdown and step-down events, that result in the slope becoming unstable in those locations. These findings indicate that overall, the current reservoir release patterns do not cause adverse impacts on the downstream riverbanks, although a gradual drawdown after a prolonged high flow event during the wet season would reduce unfavorable conditions that threaten riverbank stability. / Ph. D.

Esta investigación tiene por finalidad Comparar las ecuaciones de equilibrio limite Morgenstern-Price, Spencer, Sarma aplicado a la estabilidad del talud del cerro Chalpón, distrito de Motupe y buscar una solución de estabilización del talud, el factor de seguridad del talud se obtendrá mediante el modelado en el software Slide, los datos que el software necesita son el perfil topográfico del talud, la cohesión, ángulo de fricción y peso específico de los materiales que lo conforman, para encontrar estos datos se debe hacer algunos ensayos de laboratorio cómo el ensayo de corte, el ensayo de peso específico y el ensayo de compresión de la roca. Se clasifico el macizo rocoso mediante índices de Bieniawski (R.M.R) con índices desde 47% hasta 63% mientras índice de calidad “Q” (Q de Barton) oscilo entre 0.325 a 2.375. Se elaboró 6 perfiles y cada perfil con 3 escenarios, de los cuales 4 perfiles tuvieron un factor de seguridad menor a 1.3, y se optó por las soluciones de estabilidad para el perfil “B” usar material de relleno (afirmado), para el perfil “C” se consideró 7 micropilotes de 5 m con diámetro de 13 cm distribuidos cada 1.5 m transversal y en el eje longitudinal estás distribuido cada 1 m, para perfil de “D” también necesita un muro de contención, y se debe rellenar como se muestra en el detalle con afirmado de las mismas características que el perfil C, para el perfil E se necesita 9 micropilotes de 13 cm de diámetro y 4 m de longitud y en el eje longitudinal estás distribuido cada 1 m, todos los micro pilotes serán clavados perpendicular al terreno. La solución beneficiará a que no haya deslizamientos de rocas ni de terrenos, lo que hará mantener su forma del cerro, evitando así el movimiento de tierra o escombros debido a deslizamientos. / The purpose of this research is to compare the equations of limit equilibrium Morgenstern-Price, Spencer, Sarma applied to the stability of the slope of Chalpon hill, district of Motupe and to look for a solution of slope stabilization, the safety factor of the slope will be obtained by modeling in the Slide software, The data that the software needs are the topographic profile of the slope, the cohesion, friction angle and specific weight of the materials that conform it, to find these data some laboratory tests must be done how the shear test, the specific weight test and the rock compression test. The rock massif was classified by means of Bieniawski indexes (R.M.R) with indexes from 47% to 63% while quality index "Q" (Barton's Q) ranged between 0.325 to 2.375. Six profiles were elaborated and each profile with three scenarios, of which four profiles had a safety factor lower than 1.3, and stability solutions were chosen for profile "B" using backfill material, for profile "C" 7 micropiles of 5 m with a diameter of 13 cm were considered, distributed every 1.5 m transversely and in the axis of the profile "C". 5 m transverse and in the longitudinal axis you are distributed every 1 m, for profile "D" also needs a retaining wall, and should be filled as shown in the detail with affirmed of the same characteristics as profile C, for profile E is needed 9 micropiles of 13 cm in diameter and 4 m in length and in the longitudinal axis you are distributed every 1 m, all micro piles will be nailed perpendicular to the ground. The solution will benefit that there will be no sliding of rocks or land, which will maintain the shape of the hill, thus avoiding the movement of earth or debris due to landslides.

[pt] Freqüentemente as análises de estabilidade de taludes são feitas por métodos determinísticos, nos quais é obtido um Fator de Segurança (FS). Estes métodos não quantificam as incertezas existentes nas variáveis de entrada (parâmetros de resistência) na análise. Tampouco mostram detalhes sobre qual variável afeta mais o resultado. Os métodos probabilísticos permitem superar estes problemas. A presente pesquisa tem como objetivo comparar dois métodos probabilísticos geralmente utilizados (Estimativas Pontuais e Segundo Momento). Três projetos utilizados comumente na geotecnia são analisados: barragem de rejeitos, talude de solo e aterro sobre argila mole.Um aspecto importante na análise probabilística é a quantificação adequada do desvio padrão. É sabido que as propriedades dos solos mostram uma correlação no espaço, pelo que o desvio padrão calculado por métodos clássicos da estatística é superestimado em comparação ao valor real no campo. El-Ramly (2001) desenvolveu uma metodologia para o cálculo da probabilidade de ruptura considerando a correlação espacial das propriedades do solo. Esta metodologia é de difícil aplicação prática. Serão, portanto, avaliadas na presente pesquisa as técnicas geralmente usadas de probabilidade e estabilidade de taludes, juntamente com um fator de correção proposto por Vanmarcke (1977a). Estas técnicas de probabilidade de estabilidade de taludes são factíveis de serem utilizadas junto com este fator de correção. Verificou-se que o Método de Segundo Momento é de mais fácil utilização, e portanto adequado para emprego em projetos geotécnicos. / [en] The analysis of slope stability is often determined by deterministic methods, in which a Factor of Security (FS) is obtained. These methods do not quantify the uncertainty in the input variables (strength parameters). Neither these methods show details which variable affects mostly the outcome results. The probabilistic methods allow overcoming these restrictions. This study aims at comparing two probabilistic methods of general use (Point Estimates and First Order Second Moment). Three projects commonly used in geotechnical engineering are analyzed: tailings dam, slope soil and embankment on soft clay. An important aspect of the probabilistic analysis is the proper quantification of the standard deviation. It is known that the soil properties show a correlation in space, so the standard deviation, calculated by traditional methods of statistics, is overestimated when compared to the real field value. El-Ramly (2001) developed a methodology for calculating the probability of failure considering the spatial correlation of the soil properties. This methodology is difficult to apply in practice. The present study will therefore evaluate the techniques generally used in probability of failure of slopes. These probability techniques applied to slope stability can be used together with a correction factor proposed by Vanmarcke (1977b). The Second Moment Method was found to be easier to use, and therefore more suitable for geotechnical projects.

[pt] Este trabalho tem por objetivo a avaliação da estabilidade de taludes de solo quando sometidos a processos de infiltração de chuva, utilizando conceitos de Análise Limite e Análise de Confiabilidade. Primeiramente, determina-se a variação da sução no solo, para isto, emprega-se o Método dos Elementos Finitos e o Método de diferenças finitas na solução da equação de Richards. O modelo de Van Genuchten (1980) é utilizado para a curva característica. Na solução da nãolinearidade, emprega-se o método Picard Modificado. A instabilidade de taludes é estudada mediante o método de Análise Limite Numérica com base no Método de Elementos Finitos e o critério de Mohr Coulomb como critério de escoamento. A solução do problema matemático será realizada no espaço cônico quadrático com o objetivo de tornar a solução mais computacionalmente eficiente. Considerando as propriedades do solo como variáveis aleatórias foi incluída a determinação do Índice de Confiabilidade utilizando as formulações dos métodos de Monte Carlo e FORM (first order reliability method). Inicialmente são introduzidos conceitos básicos associados ao fluxo saturado-não saturado. A seguir são apresentados alguns conceitos. Sobre Análise Limite e sua formulação pelo Método de Elementos Finitos. Finalmente são introduzidos os fundamentos da Análise de Confiabilidade. Análises de confiabilidade das encostas de Coos Bay no estado de Oregon nos Estados Unidos e da Vista Chinesa no Rio de Janeiro Brasil, são apresentadas devido a que estes taludes sofreram colapso quando submetidos a processos de infiltração de água de chuva. Os resultados deste trabalho mostram que a falha das encostas ocorre quando o índice de confiabilidade atinge um valor perto de dois. / [en] This thesis aims to perform a reliability analysis of the stability of 2D soil slopes when they are submitted to water infiltration due to the rains.The time variation of the soil matric suctions is calculated first. The Finite Element Method is used to transform the Richards differential equation into a system of nonlinear first order equations. The nonlinearity of the problem is due to the use of the characteristic curve proposed by van Genuchten (1980). The Modified Picard Method is applied to solve de time-dependent nonlinear equation system. The responses of the flux-problem are transferred to the stability problem in some instants using the same time-interval (normally days).To estimate the stability of the slopes, limit analysis is used. The limit analyses are performed based on the Inferior Limit Theorem of the Plasticity Theory. The problem is defined as an optimization problem where the load factor is maximized. The equilibrium equations are obtained via Finite Element discretization and the strength criterion of Mohr-Couomb is written in the conic quadratic space. Therefore, a SOCP (Second Order Conic Programming) problem is generated. The problem is solved using an interior point algorithm of the code Mosek.Since the soil properties are random variables a reliability analysis can be performed at each instant of the time-dependent problem. In order to perform the reliability analyses, Response Surfaces for the failure function of the slope are generated. In this work, the Stochastic Collocation Method is used to generate Response Surfaces. The Simulation Monte Carlo Method and the FORM (First Order Reliability Method) are used to obtain both the reliability index and the probability of failure of the slopes.Reliability analyses of the Coos Bay Slope in the state of Oregon in USA and in the Vista Chinesa Slope in Rio de Janeiro, Brazil, are presented because they collapse due to rainfall infiltration. The results show that the soil slope fails when the related reliability index is close to two.

A presença de encostas com solos na condição não saturada é muito comum na região Sudeste brasileira devida às características climáticas e hidrogeológicas regional. Neste caso, o mecanismo de instabilização pode ser basicamente descrito pela redução da coesão aparente provocada pela infiltração da água da chuva, causada pela diminuição ou até mesmo a anulação dos efeitos da sucção matricial, tornando o talude instável. O presente trabalho apresenta um estudo dos mecanismos instabilizadores em um talude de corte composto por solo residual arenoso localizado na Rodovia Luis Augusto de Oliveira (SP-215) no km 179+300 LE, próximo ao município de Ribeirão Bonito, Brasil. Neste trabalho foi realizado um levantamento dos dados e das propriedades do solo (física, mecânica e hidráulica) da área piloto utilizando métodos de investigação geológico-geotécnica de superfície (levantamento topográfico de detalhe, caminhamentos) e de subsuperfície (sondagem a trado e poços com coleta de amostras); ensaios de laboratório e de campo (índices físicos do solo, resistência ao cisalhamento, permeabilidade); instrumentação e monitoramento (piezômetro, pluviômetro e tensiômetro) e modelagem numérica (análises da infiltração da água da chuva e de estabilidade de talude). Na área investigada ocorrem solos residuais dos arenitos eólicos da Formação Botucatu (Grupo São Bento, Bacia Sedimentar do Paraná) de idade jurássico-cretácea. As modelagens numéricas realizadas no programa GeoStudio versão 2012 (Seep/W e Slope/W) confirmaram que é possível ocorrer deslizamentos rasos de solo somente pela redução da sucção e perda de coesão aparente. As modelagens do fluxo da água infiltrada no talude apresentaram resultados divergentes das leituras registradas pelos tensiômetros instalados no talude monitorado e os fatores de segurança mostraram serem bem superiores ao unitário, mesmo ocorrendo chuvas de alta intensidade pluviométrica. Estas modelagens numéricas também permitiram estabelecer a configuração geométrica crítica (altura e inclinação) para os taludes de corte em solo residual arenoso da Formação Botucatu. / The presence of slopes with soil in the unsaturated condition is very common in Brazil\'s Southeast region due to climate and regional hydrogeological characteristics. In this case, the instability mechanism can be basically described by the apparent cohesion loss caused by the rainfall infiltration that induced by the reduction or even annulling the effect of matric suction, making the slope conditionally unstable. This paper presents a study of instabilizing mechanisms in a cut slope composed of sandy residual soil located on Highway Luis Augusto de Oliveira (SP-215) at km 179 + 300 LE, near Ribeirão Bonito, Brazil. This work was carried out a survey of the data and soil properties (physical, mechanical and hydraulic) of pilot area using geological and geotechnical research techniques of surface (topographic survey) and subsurface (soil sampling and hand auger drilling); laboratory and field tests (physical indices soil, shear strength, permeability); instrumentation and monitoring (piezometer, rain gauge and tensiometer) and numerical modelling (analysis of rainfall infiltration and slope stability). In the investigated area occur residual soils of aeolian sandstones of Botucatu Formation (São Bento Group, Paraná Sedimentary Basin) Jurassic- Cretaceous age. The numerical modelling performed in GeoStudio version 2012 (Seep/W and Slope/W) confirmed that it is possible to have shallow soil slips just reducing the suction loss and apparent cohesion. The modelling of the infiltrated water flow on the slope showed conflicting results of the readings recorded by tensiometers installed on the monitored slope and the safety factors shown to be well above the unit, even occurring high intensity rainfall. These numerical models also allowed to establish the geometric critical configuration (height and slope angle) for cut slopes in a sandy residual soil of Botucatu Formation.

Os escorregamentos de taludes de corte rodoviários verificados na região entre as cidades de Jarinu e Campo Limpo Paulista, ambas no estado de São Paulo, são derivados da atuação conjunta do intemperismo, da presença de estruturas reliquiares, e sua geometria, e das técnicas construtivas. Dentre estes fatores, as estruturas reliquiares (foliação e fraturas) desempenham o papel mais importante, pois os escorregamentos ocorrem quando há incompatibilidade entre as atitudes das estruturas e a geometria dos taludes de corte facilitando os escorregamentos, principalmente quando a face de taludes é paralela ou subparalela à foliação e esta mergulha na direção da estrada. O levantamento destas estruturas, utilizando-se em conjunto produtos de sensoriamento remoto, que possibilita a elaboração de uma análise geométrica regional, que também se aplica em escala de afloramento, pois as estruturas geológicas, em qualquer escala, apresentam feições em comum. Os produtos gerados são mapas de forma estrutural, de traços de fraturas e o estabelecimento de setores homogêneos baseados nas diferentes direções da foliação. Nos vários taludes estudados, são elaborados estereogramas que permitem a visualização espacial das descontinuidades. Com base nestes produtos, são feitas previsões de instabilidades, através de uma simulação de três direções de traçados rodoviários, onde são avaliadas as possibilidades de ocorrência de instabilidades. Os resultados obtidos em dados regionais são confrontados com os dados extraídos em campo nos vários taludes estudados, para a obtenção da aplicabilidade da metodologia utilizada. / The sliding of highways cut slopes verified between Jarinu and Campo Limpo Paulista, both in São Paulo state, region are originated of action ensemble of weathering, relicts structures presence, geometric and the constructive characteristics. Among them, the relict structures (foliation and fractures) perform the very important hole, because the sliding is effective when there is incompatibility between spacial attitudes of structures and the geometry of cut slopes. In the great number, the geometry of cut slopes facility the sliding, mainly when the slopes surface is parallel or sub parallel to foliation, diverging to the highway bed. The investigation of structures together with remote sensing images enables the elaboration of a geometrical analysis, applicable in outcrop scale, as geological structures in any scale, ranging from microscopical up to regional, have common features. The mapping of joints and foliation were made and well-defined sectors were separated, on the basis of different foliation attitudes. Stereographic nets were made for all slopes studied and the efficiency of graphical stability analysis in saprolitos was estimated, where there is a significant action of erosion processes. Lastly, the possibility of slides and erosional processes within the several sectors is evaluated, along three possible different highway directions. The predicted results, based on regional data, are compared to field data, obtained in the slopes, in order to confirm the applicability of the method under investigation.

Lihir Gold Mine in Papua New Guinea is one of the largest gold mines in the world situated in a seismically sensitive zone. The gold deposit is located in an extinct volcano in close proximity to the sea shore and presents a series of geohazards. Some geohazards are uncommon and include: geothermal outbursts, cavities, water inrush and earthquake/ tsunami. After a major multi-batter (5 benches high) slope failure that occurred on the 1st of October 2009, a team of engineers, lead by the author investigated the incident and made series of recommendations. Arising out of these recommendations, a comprehensive Geohazard Management Plan was formulated by revisiting, revising and putting together all the individual geohazard management plans as a single document. This thesis describes the outcomes of the investigation and presents an overview and systematic approach in formulation of the Geohazard Management Plan, apart from a summary of the gaps that were identified in the existing system, major contributions that were made as well as the expected improvements and constraints in managing these geohazards. / Mining Engineering

Σκοπός της παρούσας Διατριβής Ειδίκευσης είναι η ανάλυση, η παρουσίαση και η αξιολόγηση των τεχνικογεωλογικών – γεωτεχνικών συνθηκών των οικισμών Καρυάς και Ν. Σουλίου του Δήμου Πατρέων, σε σχέση με την ευστάθεια των φυσικών πρανών και τις συνθήκες γεωλογικής καταλληλότητας για τις προς δόμηση περιοχές. Η εν λόγω περιοχή παρουσιάζει αξιόλογο ενδιαφέρον, λόγω των ιδιαίτερων και σύνθετων γεωλογικών συνθηκών, των συχνών και σημαντικών κατολισθητικών φαινομένων των τελευταίων ετών που προκάλεσαν σημαντικές καταστροφές σε τεχνικά έργα και ανθρώπινες περιουσίες, αλλά και λόγω της ραγδαίας οικιστικής ανάπτυξης που παρατηρείται τα τελευταία χρόνια στα περίχωρα της πόλης της Πάτρας. Στα πλαίσια της Διατριβής και της παράλληλης Έρευνας του Εργαστηρίου Τεχνικής Γεωλογίας στην περιοχή ενδιαφέροντος πραγματοποιήθηκε κατά τα τη χρονική περίοδο 2003-2005 λεπτομερής γεωτεχνική έρευνα που περιελάμβανε ανόρυξη δειγματοληπτικών γεωτρήσεων σε επιλεγμένες θέσεις με ταυτόχρονη τοποθέτηση αποκλισιομέτρων, συστηματική λήψη αποκλισιομετρικών μετρήσεων, σειρά εργαστηριακών και επί τόπου δοκιμών σε κατάλληλα διαμορφωμένα δείγματα, λεπτομερή καταγραφή των τεχνικογεωλογικών συνθηκών της περιοχής με βάση κυρίως τη σύσταση, τη δομή των γεωλογικών σχηματισμών και τη γενικότερη φυσική τους κατάσταση και συμπεριφορά, αλλά και σε φαινόμενα ευστάθειας των φυσικών πρανών, ιδιαιτέρως λόγω του σημαντικού ιστορικού κατολισθητικών κινήσεων στην περιοχή της Καρυάς τα τελευταία χρόνια. Μέσω της κατασκευής αντιπροσωπευτικών εδαφικών προσομοιωμάτων έγινε διάκριση των σχηματισμών της περιοχής έρευνας σε επιμέρους Γεωτεχνικές Ενότητες και σχεδιάστηκαν αντιπροσωπευτικές γεωτεχνικές – τεχνικογεωλογικές διατομές με σκοπό τη σύνθεση και ερμηνεία του γεωτεχνικού περιβάλλοντος της περιοχής. Παράλληλα πραγματοποιήθηκαν αναλύσεις ευστάθειας πρανών με χρήση εξειδικευμένου λογισμικού σε επιλεγμένες διατομές κατά μήκος των γεωτρήσεων, τόσο στην κατολισθαίνουσα ζώνη της Καρυάς, όσο και στην οικιστική ζώνη. Η σύνθεση των αποτελεσμάτων της γεωλογικής και γεωτεχνικής έρευνας οδήγησε στον προκαταρκτικό διαχωρισμό της περιοχής σε ζώνες κατάλληλες, ακατάλληλες ή κατάλληλες για δόμηση υπό προϋποθέσεις με σκοπό τη διασφάλιση του δομημένου περιβάλλοντος από φυσικούς κινδύνους ή κινδύνους προερχόμενους από ανθρώπινες επεμβάσεις και δραστηριότητες. / The aim of this ΜSc. Project is the presentation, the analysis and assessment of the geological and geotechnical conditions of the sub-urban regions of N. Souli – Karya, Patras, Western Greece. The study area is an area with complex geological conditions and is well known especially for the important and large-scale landslide phenomena which have taken place during the last years near Karya village. This project was done along with survey of the Laboratory of Engineering Geology, Geology Department, University of Patras. The full survey program included geological mapping focused on the engineering properties of the soil and rock formations, fifteen (15) sampling boreholes, inclinometer installation and measurement and laboratory tests. Through laboratory testing and detailed description of soil and rock samples the formations were classified in several units and several geotechnical cross-sections were constructed to make a general geological-geotechnical model of the study area. The geological and geotechnical data were used to perform Limit Equilibrium Slope Stability analysis. The survey results were used to divide the regions of Karya and N. Souli in some zones according to soil suitability for construction purposes.