Analysis of failure of unsaturated soil slope due to rainfall based on soil-water-air seepage-deformation coupling FEM

被引：0
|
作者：
Xiong Y.-L. [1 ,2 ]
Zhu H.-H. [2 ]
Ye G.-L. [3 ]
Ye B. [2 ]
机构：
[1] Institute of Geotechnical Engineering, Ningbo University, Ningbo, 315211, Zhejiang
[2] Department of Ceotechnical Engineering, Tongji University, Shanghai
[3] Department of Civil Engineering, Shanghai Jiaotong University, Shanghai
来源：
Yantu Lixue/Rock and Soil Mechanics | 2017年 / 38卷 / 01期
基金：
中国博士后科学基金;
关键词：
FEM; Rainfall infiltration; Seepage-deformation coupling analysis; Slope failure; Soil-water-air coupling analysis;
D O I：
10.16285/j.rsm.2017.01.036
中图分类号：
学科分类号：
摘要：
In order to understand the failure mechanism of slope due to rainfall infiltration, a soil-water-air seepage-deformation coupling finite element program is developed based on finite element-finite difference scheme. In the program, the unsaturated elastoplastic constitutive model using Bishop effective stress and degree of saturation as state variables, proposed by Zhang et al[1], is used to describe the mechanical behaviors of soil from unsaturated state to saturated state due to rainfall infiltration. Meanwhile, Green-Naghdi stress rate tensor is used in the program so as to be able to consider the finite deformation in the process of failure. The program can not only simulate the seepage of water due to rainfall, the change of the degree of saturation, the migration of the air pressure, but also can describe the mechanical behaviors of the unsaturated soil such as the deformation of the ground, the change of pore water pressure, the formation of the shear band occurred in the slope failure on the whole in a unified way. In addition, a laboratory slope model test is simulated by the proposed soil-water-air seepage-deformation coupling FEM. By comparing with the test results, the availability of the proposed numerical method is verified. © 2017, Science Press. All right reserved.
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页码：284 / 290
页数：6
相关论文
共 16 条
  • [1] Zhang F., Ikariya T., A new model for unsaturated soil using skeleton and degree of saturation as state variables, Soils and Foundations, 51, 1, pp. 67-81, (2011)
  • [2] Zhao S.-C., Experimental study of centrifuge model of soil slope under rainfall infiltration, (2014)
  • [3] Jiang Z.-M., Xiong X.-H., Zeng L., Unsaturated seepage analysis of slope under rainfall condition based on FLAC<sup>3D</sup>, Rock and Soil Mechanics, 35, 3, pp. 855-861, (2014)
  • [4] Niu W.-J., Ye W.-M., Liu S.-G., Et al., Limit analysis of a soil slope considering saturated-unsaturated seepage, Rock and Soil Mechanics, 30, 8, pp. 2477-2482, (2009)
  • [5] Rong G., Wang S.-J., Wang E.-Z., Et al., Stability analysis of Yuanmo highway slope under intensive rainfall, Chinese Journal of Rock Mechanics and Engineering, 27, 4, pp. 704-711, (2008)
  • [6] Yao H.-L., Zheng S.-H., Li W.-B., Et al., Parametric study on the effect of rain infiltration on stability of unsaturated expansive soil slope, Chinese Journal of Rock Mechanics and Engineering, 21, 7, pp. 1034-1039, (2007)
  • [7] Liu Z.-Z., Yan Z.-X., Limit equilibrium slice method for unsaturated clay slope under rainfall infiltration, Rock and Soil Mechanics, 37, 2, pp. 350-356, (2016)
  • [8] Xu H., Zhu Y.-W., Cai Y.-Q., Et al., Stability analysis of unsaturated soil slopes under rainfall infiltration, Rock and Soil Mechanics, 26, 12, pp. 1957-1962, (2005)
  • [9] Ding J.-H., Chen R.-P., Tong J., Et al., Research on failure mechanism of shallow instability of expansive soil slope based on multi-field coupling numerical analysis, Rock and Soil Mechanics, 36, pp. 159-168, (2015)
  • [10] Leong E.C., Rahardjo H., Permeability functions for unsaturated soils, Journal of Geotechnical and Geoenvironmental Engineering, 123, 12, pp. 1118-1126, (1997)
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