Slope stability considering zonal anisotropy and seepage effects

ZHANG Bangxin; JIA Jianqing; LAI Yuanming; WANG Hongtu; XIN Chengping

doi:10.11835/j.issn.2096-6717.2021.192

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Slope stability considering zonal anisotropy and seepage effects

Civil Engineering | 更新时间：2023-07-10

- Slope stability considering zonal anisotropy and seepage effects
- Journal of Civil and Environmental Engineering Vol. 45, Issue 4, Pages: 41-48(2023)
- 作者机构：
  
  1.兰州交通大学交通运输学院，兰州 730070
  2.中国科学院西北生态环境资源研究院，兰州 730000
  3.重庆大学资源与安全学院，重庆 400044
- 作者简介：
  
  brief: ZHANG Bangxin (1997- ), main research interest: slope engineering, E-mail: zbx724@qq.com.
  JIA Jianqing（corresponding author）, professor, PhD, E-mail: jqjia@mail.lzjtu.cn.
- 基金信息：
  
  Science and Technology Program of Gansu Province(20YF8FA042);Foundation of A Hundred Youth Talents Training Program of Lanzhou Jiaotong University(152022)
- DOI：10.11835/j.issn.2096-6717.2021.192
  CLC： TU413.62
- Received：30 May 2021，
  
  Published：25 August 2023
- 稿件说明：
移动端阅览
ZHANG Bangxin, JIA Jianqing, LAI Yuanming, et al. Slope stability considering zonal anisotropy and seepage effects[J]. Journal of Civil and Environmental Engineering, 2023, 45(4): 41-48.
DOI：

ZHANG Bangxin, JIA Jianqing, LAI Yuanming, et al. Slope stability considering zonal anisotropy and seepage effects[J]. Journal of Civil and Environmental Engineering, 2023, 45(4): 41-48. DOI： 10.11835/j.issn.2096-6717.2021.192.

摘要

土体强度各向异性和渗流作用是影响边坡稳定性的重要因素。为使稳定性计算时边坡土体强度的各向异性更切合实际，提出对成层边坡土体进行分级加载和分区考虑强度各向异性的方法：将边坡土体最大主应力方向角与成层土相交区域设置为初始分区，然后结合有限元计算结果，推导各成层土各向异性强度参数计算公式，并即时计算各分区内土体强度参数；在逐级施加荷载过程中，根据计算所得土体强度参数，进一步调整初始分区，通过初分、细分和精分3级控制，确定耦合计算分区和各分区土体强度参数。在此基础上，建立考虑土体分区各向异性、未分区各向异性和未分区各向同性3种工况的流固耦合模型，分析边坡体应力场、位移场和渗流场的变化规律和特点，并采用强度折减法计算边坡稳定性。结果表明：考虑土体分区各向异性时，坡体平均应力最大值较未分区各向异性时有所减小，但较未分区各向同性时有所增大，其渗流域和流速较其他两种工况均有所减小；考虑土体分区各向异性时，计算所得边坡稳定性系数为1.109，较其他两种工况分别下降了2.8%和21.3%。

Abstract

Soil strength anisotropy and seepage are important factors affecting the stability of slopes. In order to make the anisotropy of slope soil strength more practical in stability calculation

a method of graded loading and zoning of layered slope soil considering strength anisotropy is proposed. Firstly

the initial zoning is established according to the size distribution of the maximum principal stress direction angle of the slope soil and the intersection area of layered soil

and then

combined with the finite element calculation results

the formula for determining the anisotropy strength parameter of each layered soil is derived and the strength parameter of each zoning is calculated instantly. Secondly

in the process of applying load step by step

the initial partition is further adjusted according to the calculated soil strength parameters

the partition and the corresponding strength parameters of the coupling calculation are determined through three-level control of initial partition

subdivision and fine partition. On this basis

a flow-solid coupling model considering three working conditions: zoned anisotropy

unzoned anisotropy and unzoned isotropy of the soil body is established

and the change laws and characteristics of the stress field

displacement field and seepage field of the slope body are analyzed

and the stability of the slope is calculated using the strength reduction method. The results show that the average stress maximum value of zoned anisotropy is lower than that of unzoned anisotropy

but greater than that of unzoned isotropy

the seepage and flow velocities are lower than those of the other two cases; the calculated slope stability coefficient of zoned anisotropy is 1.109

which is 2.8% and 21.3% lower than those of the other two cases respectively.

关键词

Keywords

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