土体抗拉强度对均质边坡稳定性的影响

doi:10.13278/j.cnki.jjuese.20200281

吉林大学学报(地球科学版) ›› 2021, Vol. 51 ›› Issue (5): 1324-1337.doi: 10.13278/j.cnki.jjuese.20200281

土体抗拉强度对均质边坡稳定性的影响

张海清^1,2,3,4, 贾会会⁵, 聂庆科^2,3

1. 北京交通大学土木建筑工程学院, 北京 100044;
2. 河北建设勘察研究院有限公司, 石家庄 050031;
3. 河北省岩土工程技术研究中心, 石家庄 050031;
4. 河北大学建筑工程学院, 河北保定 071002;
5. 华北地质勘查局五一四地质大队, 河北承德 067000

收稿日期:2020-11-28 出版日期:2021-09-26 发布日期:2021-09-29
作者简介:张海清(1984-),男,工程师,博士,硕士生导师,主要从事岩土与基础工程方面的教学和研究,E-mail:haiqzhang@hbu.edu.cn
基金资助:
河北省博士后科研项目择优资助计划（B2020005008）；河北省自然科学基金项目（E2019201422）；河北省高等学校科学技术研究项目（QN2020439）；天津市"131"创新人才培养工程资助项目（20180152）

Influence of Soil Tensile Strength on Stability of Homogeneous Slope

Zhang Haiqing^1,2,3,4, Jia Huihui⁵, Nie Qingke^2,3

1. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China;
2. Hebei Research Institute of Construction and Geotechnical Investigation Co., Ltd., Shijiazhuang 050031, China;
3. The Technology Center of Geotechnical Engineering of Hebei Province, Shijiazhuang 050031, China;
4. College of Civil Engineering and Architecture, Hebei University, Baoding 071002, Hebei, China;
5. 514 Brigade of North China Geological Exploration Bureau, Chengde 067000, Hebei, China

Received:2020-11-28 Online:2021-09-26 Published:2021-09-29
Supported by:
Supported by the Hebei Province Post-Doctoral Research Projects Merit-Based Funding Program (B2020005008), the Natural Science Foundation of Hebei Province (E2019201422), the Science and Technology Project of Hebei Education Department (QN2020439) and the 131 Innovative Talent Cultivation Project of Tianjin (20180152)

摘要/Abstract

摘要： 目前对均质边坡稳定性受岩土体抗拉强度影响程度的看法不一，尤其是对不同坡度的边坡受抗拉强度的影响甚至有相反意见。基于有限差分程序FLAC^3D提供的考虑张拉-剪切复合破坏的Mohr-Coulomb准则，采用强度折减法对多个典型均质边坡进行一系列数值计算，研究土体抗拉强度对不同坡度边坡稳定性的影响。结果表明：边坡越陡，土体抗拉强度对安全系数的影响越大；抗拉强度取值对直立边坡的稳定安全系数及变形破坏特征影响显著，对45°及以下边坡的影响相对较小。总体来说，对于坡角超过60°的陡坡，土体抗拉强度不同引起的边坡安全系数变化幅度可达10%以上，应在边坡稳定分析中特别注意，避免因土体抗拉强度取值过大或过小而导致计算结果偏于危险或过于保守。

关键词: 边坡稳定, 张拉和剪切, 复合破坏准则, 抗拉强度, 强度折减法

Abstract: There are different opinions on the influence of tensile strength on the stability of homogeneous slopes, especially for slopes with different inclinations. Based on the composite tension-shear Mohr-Coulomb criterion provided by the finite difference program FLAC^3D, a series of numerical calculations were carried out for several typical homogeneous slopes by using the strength reduction method. The influence of soil tensile strength on the stability of slopes with different inclinations was studied. The results show that the steeper the slope is, the greater the influence of soil tensile strength on the safety factor of the slope. The value of soil tensile strength has great influence on the safety factor, deformation, and failure characteristics of vertical slopes. The influence on 45° inclined and gentler slopes is relatively small; while for the steep slope inclined over 60°, the variation range of the slope safety factor caused by different soil tensile strength can reach more than 10%. Therefore, special attention should be paid to the soil tensile strength in the stability analysis of steep slopes, so as to avoid the calculation results being too dangerous or too conservative because the selected value of soil tensile strength is too large or too small.

Key words: slope stability, tension and shear, composite failure criterion, tensile strength, strength reduction method

中图分类号:

P642

张海清, 贾会会, 聂庆科. 土体抗拉强度对均质边坡稳定性的影响[J]. 吉林大学学报(地球科学版), 2021, 51(5): 1324-1337.

Zhang Haiqing, Jia Huihui, Nie Qingke. Influence of Soil Tensile Strength on Stability of Homogeneous Slope[J]. Journal of Jilin University(Earth Science Edition), 2021, 51(5): 1324-1337.

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土体抗拉强度对均质边坡稳定性的影响

Influence of Soil Tensile Strength on Stability of Homogeneous Slope

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