- About
-
The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
provided by the
Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
Search results
Showing 61 to 70 of 71 (0.036 seconds)Spelling suggestions: "subject:"drainage""
| 61 |
[pt] APLICABILIDADE DE DRENOS VERTICAIS PARA MITIGAR EFEITOS DE LIQUEFAÇÃO DINÂMICA DE SOLOS / [en] APPLICABILITY OF WICK DRAINS TO MITIGATE EFFECTS OF DYNAMIC LIQUEFACTION IN SOILSMARCUS GABRIEL SOUZA DELFINO 07 August 2023 (has links)
[pt] A história registra ao longo dos séculos muitos casos de colapso de depósitos
de solos arenosos, com consideráveis prejuízos econômicos, perdas de vidas
humanas e danos ao meio ambiente, causados pela liquefação dinâmica ou por
mobilidade cíclica. Quando um desempenho satisfatório de estruturas não puder ser
garantido sob carregamento sísmico, métodos de mitigação devem ser empregados
para reduzir o potencial de liquefação. Dentre estes, a execução de drenos verticais
é solução interessante, mas desafiadora, pois drenos verticais podem ser utilizados
caso dissipem suficientemente rápido os excessos de poropressão e transportem
eficientemente o volume de água durante os poucos segundos de duração de
terremotos. Uma dificuldade é a avaliação do coeficiente de permeabilidade do
depósito de solo, o que afeta e torna incerta a distância desejável entre drenos. Nesta
dissertação, análises do desempenho de drenos verticais para mitigação de
liquefação dinâmica são realizadas com base em formulações matemáticas e
modelos numéricos pelo método dos elementos finitos. / [en] Throughout centuries there are many recorded cases of collapse of sandy
deposits with considerable economic losses, loss of human life and damage to the
environment caused by the dynamic liquefaction or cyclic mobility. When a
satisfactory performance of structures can’t be guaranteed under seismic loading,
methods of mitigation must be employed in order to reduce the potential of
liquefaction. Among these methods, the execution of prefabricated vertical drains
is an interesting, but challenging, solution, because drains can be used if they
dissipate very quickly the excess of porepressure generated during the small
duration of earthquakes. One of the main challenges is to evaluate the coefficient
of permeability of the deposit which affects and brings uncertainties to the desirable
distance between the drains installed. On this work, analysis of the performance of
vertical drains to mitigate dynamic liquefaction are performed based in
mathematical formulations and numerical models through the Finite Element
Method.
|
| 62 |
Decision Tree for Ground Improvement in Transportation ApplicationsYenco, Aileen C. January 2013 (has links)
No description available.
|
| 63 |
Identifying Subsurface Tile Drainage Systems Utilizing Remote Sensing TechniquesThompson, James January 2010 (has links)
No description available.
|
| 64 |
Viscoplastic modelling of embankments on soft soilsManivannan, Ganeshalingam, Aerospace, Civil & Mechanical Engineering, Australian Defence Force Academy, UNSW January 2005 (has links)
A major instrumented geosynthetic reinforced approach embankment was constructed to 5.5 m elevation above ground, with prefabricated vertical drains, over a soft compressible clay deposit at Leneghan, Newcastle, Australia in May 1995. The field monitoring of settlements for over six years shows that the embankment manifests significant creep. The instrumentation, field performance and the finite element analyses for predicting the long-term performance of this embankment are described in this thesis. The maximum settlement of 1.1 m was observed one year after the completion of construction. However, the embankment continued to settle at a rate of 0.4 mm/day for the next 5 years. The horizontal displacements of 0.09-0.14 m at various locations and the maximum reinforcement strains of 0.67% were recorded. A numerical model was developed to perform a fully coupled large deformation elasto-viscoplastic finite element analysis for this performance prediction based on creep model proposed by Kutter and Sathialingam (1992). The foundation soil was modelled with creep material behaviour using six noded linear strain triangular elements. A well-documented case history ??? Sackville embankment, New Brunswick, Canada was analysed using this model as a benchmark problem and the model was found to predict all the behaviour characteristics reasonably well. The results obtained from finite element analysis using this model are shown to be in reasonable agreement with the observed performance of Leneghans embankment in terms of settlements, horizontal displacements, excess pore pressures and geosynthetic strains. But, the prediction of settlements was less than satisfactory beyond April 1999. Finite element analyses were performed to study the sensitivity of this embankment behaviour on the variation of hydraulic conductivity values and geosynthetic reinforcement properties. This sensitivity study indicated that the kv variation, the kh/kv ratio and the nominal values of geosynthetic properties adopted in the benchmark analysis are reasonable enough for the long-term behaviour prediction.
|
| 65 |
Viscoplastic modelling of embankments on soft soilsManivannan, Ganeshalingam, Aerospace, Civil & Mechanical Engineering, Australian Defence Force Academy, UNSW January 2005 (has links)
A major instrumented geosynthetic reinforced approach embankment was constructed to 5.5 m elevation above ground, with prefabricated vertical drains, over a soft compressible clay deposit at Leneghan, Newcastle, Australia in May 1995. The field monitoring of settlements for over six years shows that the embankment manifests significant creep. The instrumentation, field performance and the finite element analyses for predicting the long-term performance of this embankment are described in this thesis. The maximum settlement of 1.1 m was observed one year after the completion of construction. However, the embankment continued to settle at a rate of 0.4 mm/day for the next 5 years. The horizontal displacements of 0.09-0.14 m at various locations and the maximum reinforcement strains of 0.67% were recorded. A numerical model was developed to perform a fully coupled large deformation elasto-viscoplastic finite element analysis for this performance prediction based on creep model proposed by Kutter and Sathialingam (1992). The foundation soil was modelled with creep material behaviour using six noded linear strain triangular elements. A well-documented case history ??? Sackville embankment, New Brunswick, Canada was analysed using this model as a benchmark problem and the model was found to predict all the behaviour characteristics reasonably well. The results obtained from finite element analysis using this model are shown to be in reasonable agreement with the observed performance of Leneghans embankment in terms of settlements, horizontal displacements, excess pore pressures and geosynthetic strains. But, the prediction of settlements was less than satisfactory beyond April 1999. Finite element analyses were performed to study the sensitivity of this embankment behaviour on the variation of hydraulic conductivity values and geosynthetic reinforcement properties. This sensitivity study indicated that the kv variation, the kh/kv ratio and the nominal values of geosynthetic properties adopted in the benchmark analysis are reasonable enough for the long-term behaviour prediction.
|
| 66 |
Vliv přísad redukujících smrštění na reologické vlastnosti vysokopevnostního betonu / The effect of the shrinkage reducing additives on rheological properties of high-strength concreteČervenka, Jiří January 2013 (has links)
Master’s thesis examines the effect of the shrinkage reducing additives on rheological properties of high-strength concrete. The first part is focused on high-strength concrete in terms of their composition and properties. The second part contains a detailed analysis of the cementitious composites shrinkage problems. Total shrinkage is divided into individual elementary shrinkages. For each of them there is a detailed description of causes and factors that affect their sizes. The next part describes the basic additives used to reduce the shrinkage of cementitious composites. The experimental part is focused on verifying the effectiveness of the shrinkage reducing additives during preparation of high-strength concrete. Usage of shrinkage drains for relative strain measurement enables to determine the process of shrinkage immediately after placing the concrete in the form and to obtain the overall curve of the hight-strength concrete volume changes during its setting and hardening. At the end of the thesis, there are overall analysis and summary of the results of the performed experiments.
|
| 67 |
Some Legal Problems of Urban RunoffHolub, Hugh 06 May 1972 (has links)
From the Proceedings of the 1972 Meetings of the Arizona Section - American Water Resources Assn. and the Hydrology Section - Arizona Academy of Science - May 5-6, 1972, Prescott, Arizona / Pressure is being brought to bear on national resources of air, earth, and water in the growing cities in the arid southwest. Legal questions involved in capturing urban runoff and putting it to a beneficial use are examined. Urbanization of a watershed results in a 3 to 5 fold increase in runoff amounts. Legal aspects include tort liability from floods, water rights to the increased flows, land use restrictions along banks and flood plains, condemnation of land for park development and flowage easements, financing problems, zoning applications, and coordination of governmental bodies responsible for parks, storm drainage and related services. Urban runoff is the most obvious legal problem in the tort liability area. It appears feasible to divert small quantities of water from urban wastes for recreational uses which provide flood control benefits. It appears that municipalities could appropriate increased flows caused by urbanization. The ultimate legal questions remain to be resolved by legislation, litigation or extension of the appropriative system.
|
| 68 |
Zdravotně technické a plynovodní instalace v obytné budově / Sanitation installation and gas installation in a residential buildingVilhelmová, Marie January 2015 (has links)
The thesis deals with plumbing in a residential building in Brno. The theoretical part is devoted to the development of residential bathroom units over time. The experimental part is focused on versions of such core units. The work also focuses on possible options and requested specifics. The project part solves sanitary equipment and installation of a residential building in the selected case. It is a multi-storey building which is intended for long-term living.
|
| 69 |
Zajištění náhradního způsobu odvodů odpadu obklíčené nemovité věci v cizím areálu / Provision of alternative refuse collection for a real estate surrounded by foreign propertyKvapil, Radek January 2016 (has links)
The thesis deals with possible ways of drainage and wastewater disposal. The issue of wastewater discharge to the environment has been closely monitored in recent years, and there is an apparent effort to improve the current situation.The dissertation discusses and compares three selected options – access to improved sanitation, building reservoirs and domestic wastewater treatment plant.The final section is dedicated to a comparison of acquisition and operating costs over time and to subsequent evaluation of the most suitable option. For the sake of clarity and assessment of potential solutions, the locality in the administrative area Vysoké Mýto - Domoradice has been selected as a model. The local authorities have been designing a public storm sewer, and given that it is surrounded by land, this issue will need to be addressed.
|
| 70 |
Evaluating the Advective Capacity of Regional Groundwater Flow Regimes to Transport Legacy DRP in a Tiled Farm Field of The Maumee River WatershedMcCormick, Matthew Ryan January 2021 (has links)
No description available.
|
Page generated in 0.0432 seconds