强度折减法与重度增加法对边坡稳定安全系数的影响  

Influences of Strength Reduction Method and Gravity Increase Method on Slope Stability

作　　者：朱文炜 任旭华[1] 张继勋[1] ZHU Wen-wei;REN Xu-hua;ZHANG Ji-xun(College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China)

机构地区：[1]河海大学水利水电学院,江苏南京210098

出　　处：《水电能源科学》2019年第1期127-131,共5页Water Resources and Power

基　　金：国家自然科学基金重点项目(U1765204);江苏省水利科技资助项目(2017074)

摘　　要：针对重度增加法计算结果相对强度折减法偏大的问题,以某均质土坡为分析模型,分别采用强度折减法、修正泊松比的改进强度折减法、重度增加法及改进重度增加法对边坡进行稳定性分析,并研究了土体强度参数对安全系数的敏感性。结果表明,保持内摩擦角为定值时,四种算法的安全系数均随粘聚力变化拟合为线性函数;保持粘聚力为定值时,除重度增加法外其他三种算法计算结果仍可拟合为线性函数;改进后的强度折减法与重度增加法计算结果与传统强度折减法十分接近,但数值相对保守。研究结果为边坡稳定分析提供了参考。For the problem that the safety factor calculated by gravity increase method is larger than the strength reduction method,the stability analysis of a homogenous soil slope was taken by strength reduction method,strength reduction method with modified Poisson’s ration,gravity increase method and improved gravity increase method respectively.And then the sensitivity analysis of the soil shear strength parameters was carried out.It is shown that the results of the four algorithms can be fitted to linear functions as the internal friction angle changes with the cohesion force fixed.However,when the internal friction angle remains unchanged,the results can be fitted as linear functions as the cohesion force changes except for the gravity increase method.The results of the improved gravity increase method and strength reduction method are very close to the traditional strength reduction method,but the value is relatively conservative.The research results provide a reference for stability analysis of slope.

关 键 词：边坡稳定 强度折减法 改进强度折减法 重度增加法 改进重度增加法 数值拟合 

分 类 号：TU473.1[建筑科学—结构工程]