安全与环境工程2024，Vol.31Issue(3)：178-187,10.DOI:10.13578/j.cnki.issn.1671-1556.20230138
不同含水量及渗透特性下强风化砂岩土边坡稳定性分析
Stability analysis of strongly weathered sandstone soil slopes with different water contents and permeability characteristics
摘要
Abstract
In order to explore the changes in water content of weathered sandstone soil and the impact of rainfall intensity on landslide stability,taking the strongly weathered sandstone soil of Huangcaoping land-slide in Henghe Township,Wanzhou District as an example,the relationship between soil shear strength in-dex and water content was obtained using unsaturated soil mechanics theory.Fast shear tests,compression tests,and permeability tests were conducted on the strongly weathered sandstone soil,and numerical simu-lation methods were used to analyze the maximum displacement,matrix suction,saturation,and slope sta-bility coefficient of the weathered sandstone soil slope with different water contents and rainfall durations.The results show that with the optimal moisture content as the critical point,when the moisture content in-creases from 11.31％to 21.57％,the cohesion increases from 7.28 kPa to the maximum value of 10.23 kPa and then decreases to 5.10 kPa;the internal friction angle slowly decreases from 15.28°to 7.94°,and the deformation modulus decreases from the initial 8.97 MPa to 2.06 MPa;there is a linear relationship be-tween the permeability coefficient and moisture content,and the fitting formula is y=5 ×10-6x+7×10-6;with different moisture contents,the slope stability coefficient first increases and then decreases,and the position of the potential sliding surface gradually increases from deep to shallow;with different rainfall du-rations,the magnitude of substrate suction is in the order of slope top＞slope surface＞slope interior,and the rate of saturation change is in the order of slope top＞slopc surface＞slope interior;the stability coeffi-cient of the slope decreases from 1.71 to 1.01.The research results can provide guidance for the stability research and treatment engineering design of slopes similar to strongly weathered sandstone with rainfall and different water contents.关键词
强风化砂岩土边坡/稳定性分析/含水量/降雨强度/剪切强度/渗透特性/有限元数值模拟Key words
strongly weathered sandstone soil slope/stability analysis/moisture content/rainfall intensity/shear strength/permeability characteristics/finite element numerical simulation分类
资源环境引用本文复制引用
孙东,周春梅..不同含水量及渗透特性下强风化砂岩土边坡稳定性分析[J].安全与环境工程,2024,31(3):178-187,10.基金项目
国家自然科学基金项目(41002112、52174085) （41002112、52174085）
武汉市重点研发计划项目(2022012202015024) （2022012202015024）
