Modeling the stress versus settlement behavior of shallow foundations in unsaturated cohesive soils extending the modified total stress approach

被引:56
作者
Oh, Won Taek [1 ]
Vanapalli, Sai K. [2 ]
机构
[1] Univ New Brunswick, Dept Civil Engn, H-124,Head Hall,17 Dineen Dr, Fredericton, NB E3B 5A3, Canada
[2] Univ Ottawa, Dept Civil Engn, CBY A015,161 Louis Pasteur, Ottawa, ON K1N 6N5, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
Unsaturated soil; Finite element analysis; Stress versus settlement; Shallow foundation; Modulus of elasticity; Poisson's ratio (IGC: E3/E13/ E14); PLATE-LOAD TESTS; BEARING CAPACITY; CHARACTERISTIC CURVE; SUCTION; PREDICTION; ELASTICITY; SATURATION; PLASTICITY; FRAMEWORK; FOOTINGS;
D O I
10.1016/j.sandf.2018.02.008
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
The mechanical behavior of unsaturated soils can be interpreted using either modified total stress or a modified effective stress approach depending on the type of soils and various scenarios of drainage conditions of pore-water and pore-air. Recent studies suggest that the bearing capacity of unsaturated cohesive soils can be more reliably estimated using the modified total stress approach (MTSA) rather than the modified effective stress approach (MESA). In the present study, a modeling technique (extending Finite Element Analysis, FEA) is proposed to estimate the bearing capacity of shallow foundations in unsaturated cohesive soils by simulating the vertical stress versus surface settlement behaviors of shallow foundations extending the MTSA. The proposed technique is verified with the model footing test results in unsaturated cohesive soils. Commercial finite element software, SIGMA/W (GeoStudio 2012, Geo-Slope Int. Ltd.) is used for this study. Details of estimating the unsaturated soil parameters (i.e. total cohesion, modulus of elasticity and Poisson's ratio) required for the FEA are also presented taking account of the influence of matric suction. Good agreements were observed between the measured bearing capacity values and those from the FEA extending the MTSA. (C) 2018 Production and hosting by Elsevier B.V. on behalf of The Japanese Geotechnical Society.
引用
收藏
页码:382 / 397
页数:16
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