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Bearing Capacity of Model Strip Footing on Unsaturated Very Loose Sand
Shallow footings are generally constructed above groundwater level. Because of a capillary zone in the underlying soil layers, the behavior of the unsaturated soils supporting the footings needs to be known. Evaluation of shallow footings’ bearing capacity on unsaturated soils is therefore important from a practical point of view. The current research focuses on understanding the effects of matric suction on the bearing capacity of shallow strip footings placed on very loose uniform sands, using experimental and numerical methods. The experimental program is implemented using a test tank equipped with a loading frame and a specially designed telescopic pipe system to control the soil's water level inside the tank. Results are then modeled numerically using commercial software with capabilities to model the behavior of unsaturated soils. The experimental results indicate that the increase in the matric suction in the unsaturated very loose sand can lead to up to a sixfold increase in strip footing bearing capacity compared to the fully saturated condition. In addition, numerical analysis results indicate that the soil’s failure mechanism underlying the footing seems to move from punching shear in the saturated soil to the local or general shear failure in the soils with greater shear strength caused by matric suction. It was also concluded that taking into account the unsaturated soil mechanics in numerical modeling leads to a generally satisfactory prediction of the load-settlement behavior obtained from the experimental results.
Bearing Capacity of Model Strip Footing on Unsaturated Very Loose Sand
Shallow footings are generally constructed above groundwater level. Because of a capillary zone in the underlying soil layers, the behavior of the unsaturated soils supporting the footings needs to be known. Evaluation of shallow footings’ bearing capacity on unsaturated soils is therefore important from a practical point of view. The current research focuses on understanding the effects of matric suction on the bearing capacity of shallow strip footings placed on very loose uniform sands, using experimental and numerical methods. The experimental program is implemented using a test tank equipped with a loading frame and a specially designed telescopic pipe system to control the soil's water level inside the tank. Results are then modeled numerically using commercial software with capabilities to model the behavior of unsaturated soils. The experimental results indicate that the increase in the matric suction in the unsaturated very loose sand can lead to up to a sixfold increase in strip footing bearing capacity compared to the fully saturated condition. In addition, numerical analysis results indicate that the soil’s failure mechanism underlying the footing seems to move from punching shear in the saturated soil to the local or general shear failure in the soils with greater shear strength caused by matric suction. It was also concluded that taking into account the unsaturated soil mechanics in numerical modeling leads to a generally satisfactory prediction of the load-settlement behavior obtained from the experimental results.
Bearing Capacity of Model Strip Footing on Unsaturated Very Loose Sand
Karkush, Mahdi O. (Herausgeber:in) / Choudhury, Deepankar (Herausgeber:in) / Nikoonejad, Khashayar (Autor:in) / Imam, Reza (Autor:in)
Geotechnical Engineering and Sustainable Construction ; Kapitel: 21 ; 255-268
20.03.2022
14 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
Unsaturated soil , Very loose sand , Bearing capacity , Physical modeling , Finite element analysis Engineering , Geoengineering, Foundations, Hydraulics , Geotechnical Engineering & Applied Earth Sciences , Transportation Technology and Traffic Engineering , Environment, general , Building Construction and Design
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