An analysis of rainfall infiltration of expansive soil slope based on the finite element software custom constitutive model

RAO Hong; WANG Jinshu; ZHAO Zhiming; WU Guang; FENG Tao

doi:10.16030/j.cnki.issn.1000-3665.202002020

2021 Vol. 48, No. 1

Article Contents

Article navigation > Hydrogeology & Engineering Geology > 2021 > 48(1): 154-162

Next Article Previous Article

RAO Hong, WANG Jinshu, ZHAO Zhiming, WU Guang, FENG Tao. An analysis of rainfall infiltration of expansive soil slope based on the finite element software custom constitutive model[J]. Hydrogeology & Engineering Geology, 2021, 48(1): 154-162. doi: 10.16030/j.cnki.issn.1000-3665.202002020

Citation:

RAO Hong, WANG Jinshu, ZHAO Zhiming, WU Guang, FENG Tao. An analysis of rainfall infiltration of expansive soil slope based on the finite element software custom constitutive model[J]. Hydrogeology & Engineering Geology, 2021, 48(1): 154-162. doi: 10.16030/j.cnki.issn.1000-3665.202002020

An analysis of rainfall infiltration of expansive soil slope based on the finite element software custom constitutive model

1.
School of Geoscience and Environmental Engineering, Southwest Jiaotong University, Chengdu, Sichuan　610081, China
2.
China Railway Eryuan Engineering Group Co. Ltd., Chengdu, Sichuan　610081, China

More Information

Corresponding author: ZHAO Zhiming, zmzhao@swjtu.edu.cn

Received Date: 16 February 2020

Revised Date: 31 March 2020

Publish Date: 15 January 2021

Abstract

Abstract

Under the condition of rainfall, the decrease in shear strength of a slope is one of the important factors that lead to the slope instability. Infiltration of rainwater into the slope is a dynamic process, and the water content or saturation of soil will change continuously. Therefore, it is of great significance to study the shear strength of soil under dynamic environment for real-time evaluation of the stability of soil slope under rainfall conditions. Based on the strength theory of unsaturated soil, this paper takes the expansive soil in the Jianshanying area of Guizhou Province as the object, combines the shear test data to establish the fitting relationship between the shear strength index and water content of the expansive soil, and puts forward the shear strength formula with water content as the variable. Based on the secondary development technology of ABAQUS platform, USDFLD subroutine is compiled to import the shear strength formula of the Jianshanying expansive soil, and the influence of strength attenuation and gravity change caused by the change of soil moisture content on the stability of the expansive soil slope under the condition of rainfall are also explored. The results show that with the increasing water content of the expansive soil, the particles in the soil expand by the absorbing water, the particle spacing decreases, and the adhesion between the mineral particles increases gradually. Until the water filling suction of the aggregate space decreases, the adhesion decreases rapidly, and the shear strength of the expansive soil decreases generally, in which the cohesion increases first and then decreases, and the internal friction angle decreases. The secondary development technology of ABAQUS software can realize the relationship of soil parameters with the change of water content, which provides a new technical means for the finite element analysis of unsaturated soil slope under the condition of rainfall.
- slope /
- expansive soil /
- shear strength formula /
- saturated-unsaturated seepage /
- water content /
- stability /
- finite element software /
- secondary development

FullText(HTML)

References

[1]	李国荣, 陈文婷, 朱海丽, 等. 青藏高原东北部黄土地区降雨入渗对土质边坡稳定性的影响研究[J]. 水文地质工程地质,2015,42(2):105 − 111. [LI Guorong, CHEN Wenting, ZHU Haili, et al. Influence of rain infiltration to stability of loess slope in the northeast Qinghai-Tibet Plateau[J]. Hydrogeology & Engineering Geology,2015,42(2):105 − 111. (in Chinese with English abstract) Google Scholar
[2]	NG C W W, SHI Q. A numerical investigation of the stability of unsaturated soil slopes subjected to transient seepage[J]. Computers and Geotechnics,1998,22(1):1 − 28. doi: 10.1016/S0266-352X(97)00036-0 CrossRef Google Scholar
[3]	CAI F, UGAI K, WAKAI A, et al. Effects of horizontal drains on slope stability under rainfall by three-dimensional finite element analysis[J]. Computers and Geotechnics,1998,23(4):255 − 275. doi: 10.1016/S0266-352X(98)00021-4 CrossRef Google Scholar
[4]	韦立德, 陈从新, 徐健, 等. 考虑渗流和锚固作用的强度折减有限元法研究[J]. 岩石力学与工程学报,2008,27(增刊2):3471 − 3476. [WEI Lide, CHEN Congxin, XU Jia, et al. Study on strength reduction FEM considering seepage and bolt[J]. Chinese Journal of Rock Mechanics and Engineering,2008,27(Sup2):3471 − 3476. (in Chinese with English abstract) Google Scholar
[5]	陈善雄, 陈守义. 考虑降雨的非饱和土边坡稳定性分析方法[J]. 岩土力学,2001,22(4):447 − 450. [CHEN Shanxiong, CHEN Shouyi. Analysis of stability of unsaturated soil slope due to permeation of rainwater[J]. Rock and Soil Mechanics,2001,22(4):447 − 450. (in Chinese with English abstract) doi: 10.3969/j.issn.1000-7598.2001.04.019 CrossRef Google Scholar
[6]	麻官亮, 邵玉刚. 基于Spencer法的三维极限平衡边坡稳定性研究[J]. 水文地质工程地质,2016,43(3):118 − 123. [MA Guanliang, SHAO Yugang. Study on three-dimensional limit equilibrium for slope stability based on Spencer method[J]. Hydrogeology & Engineering Geology,2016,43(3):118 − 123. (in Chinese with English abstract) Google Scholar
[7]	李宁, 刘冠麟, 许建聪, 等. 降雨条件下边坡有限元强度折减法计算平台开发及其应用[J]. 水文地质工程地质,2018,45(3):63 − 70. [LI Ning, LIU Guanlin, XU Jiancong, et al. Development of shear strength reduction method for slope stability analysis under rainfall conditions and its application[J]. Hydrogeology & Engineering Geology,2018,45(3):63 − 70. (in Chinese with English abstract) Google Scholar
[8]	王协群, 张有祥, 邹维列, 等. 降雨入渗条件下非饱和路堤变形与边坡的稳定数值模拟[J]. 岩土力学,2010,31(11):3640 − 3644. [WANG Xiequn, ZHANG Youxiang, ZOU Weilie, et al. Numerical simulation for unsaturated road-embankment deformation and slope stability under rainfall infiltration[J]. Rock and Soil Mechanics,2010,31(11):3640 − 3644. (in Chinese with English abstract) doi: 10.3969/j.issn.1000-7598.2010.11.046 CrossRef Google Scholar
[9]	李绍红, 朱建东, 王少阳, 等. 考虑降雨类型的基岩型浅层边坡稳定性分析方法[J]. 水文地质工程地质,2018,45(2):131 − 135. [LI Shaohong, ZHU Jiandong, WANG Shaoyang, et al. Stability analysis methods for the bedrock shallow slope considering rainfall types[J]. Hydrogeology & Engineering Geology,2018,45(2):131 − 135. (in Chinese with English abstract) Google Scholar
[10]	张晨阳, 张泰丽, 张明, 等. 东南沿海地区玄武岩残积土雨水运移特征及滑坡失稳数值模拟[J]. 水文地质工程地质,2019,46(4):42 − 50. [ZHANG Chenyang, ZHANG Taili, ZHANG Ming, et al. Rainfall infiltration characteristics and numerical simulation of slope instability in the basalt residual soil in the coastal area of Southeast China[J]. Hydrogeology & Engineering Geology,2019,46(4):42 − 50. (in Chinese with English abstract) Google Scholar
[11]	BISHOP A W, BLIGHT G E. Some aspects of effective stress in saturated and partly saturated soils[J]. Géotechnique,1963,13(3):177 − 197. doi: 10.1680/geot.1963.13.3.177 CrossRef Google Scholar
[12]	FREDLUND D G, MORGENSTERN N R, WIDGER R A. The shear strength of unsaturated soils[J]. Canadian Geotechnical Journal,1978,15(3):313 − 321. doi: 10.1139/t78-029 CrossRef Google Scholar
[13]	GAN J K M, FREDLUND D G, RAHARDJO H. Determination of the shear strength parameters of an unsaturated soil using the direct shear test[J]. Canadian Geotechnical Journal,1988,25(3):500 − 510. Google Scholar
[14]	卢肇钧. 非饱和土抗剪强度的探索研究[J]. 中国铁道科学,1999,20(2):10 − 16. [LU Zhaojun. Explorations on the suctional shear strength of unsaturated soils[J]. China Railway Science,1999,20(2):10 − 16. (in Chinese with English abstract) Google Scholar
[15]	缪林昌, 仲晓晨, 殷宗泽. 膨胀土的强度与含水量的关系[J]. 岩土力学,1999,20(2):71 − 75. [MIAO Linchang, ZHONG Xiaochen, YIN Zongze. The relationship between strength and water content of expensive soil[J]. Rock and Soil Mechanics,1999,20(2):71 − 75. (in Chinese with English abstract) doi: 10.3969/j.issn.1000-7598.1999.02.015 CrossRef Google Scholar
[16]	郭倩怡, 谷天峰, 吴熠哲. 永靖非饱和黄土抗剪强度试验研究[J]. 水文地质工程地质,2015,42(6):103 − 107. [GUO Qianyi, GU Tianfeng, WU Yizhe. A test study of shear strength of unsaturated loess in Yongjing County[J]. Hydrogeology & Engineering Geology,2015,42(6):103 − 107. (in Chinese with English abstract) Google Scholar
[17]	卢肇钧, 吴肖茗, 孙玉珍, 等. 膨胀力在非饱和土强度理论中的作用[J]. 岩土工程学报,1997,19(5):22 − 29. [LU Zhaojun, WU Xiaoming, SUN Yuzhen, et al. The role of swelling pressure in the shear strength theory of unsaturated soils[J]. Chinese Journal of Geotechnical Engineering,1997,19(5):22 − 29. (in Chinese with English abstract) Google Scholar
[18]	童富果, 田斌, 刘德富. 改进的斜坡降雨入渗与坡面径流耦合算法研究[J]. 岩土力学,2008,29(4):1035 − 1040. [TONG Fuguo, TIAN Bin, LIU Defu. A coupling analysis of slope runoff and infiltration under rainfall[J]. Rock and Soil Mechanics,2008,29(4):1035 − 1040. (in Chinese with English abstract) doi: 10.3969/j.issn.1000-7598.2008.04.034 CrossRef Google Scholar
[19]	吴梦喜. 饱和-非饱和土中渗流Richards方程有限元算法[J]. 水利学报,2009,40(10):1274 − 1279. [WU Mengxi. Finite-element algorithm for Richards’ equation for saturated-unsaturated seepage flow[J]. Journal of Hydraulic Engineering,2009,40(10):1274 − 1279. (in Chinese with English abstract) doi: 10.3321/j.issn:0559-9350.2009.10.018 CrossRef Google Scholar
[20]	费康, 彭劼. ABAQUS岩土工程实例详解[M]. 北京: 人民邮电出版社, 2017: 173-174. [ Google Scholar FEI Kang, PENG Jie. Detailed explanation of ABAQUS geotechnical engineering example[M]. Beijing: Posts & Telecom Press, 2017: 173-174. (in Chinese)] Google Scholar
[21]	VAN GENUCHTEN M T. A closed-form equation for predicting the hydraulic conductivity of unsaturated soils[J]. Soil Science Society of America Journal,1980,44(5):892 − 898. doi: 10.2136/sssaj1980.03615995004400050002x CrossRef Google Scholar