摘要
强度折减法为边坡稳定分析提供了较好的思路,在传统的强度折减法中,对边坡岩土体的黏聚力和内摩擦角采用相同的折减系数,但岩土体力学参数在劣化过程中有其自然规律,不一定是同步折减的,也就是说同步折减的思路不一定满足岩土体参数本身的劣化规律。基于此,以黏性土边坡为研究对象,以含水率变化导致其力学参数劣化规律为例,收集整理了大量试验资料,分析得到了含水率变化情况下黏性土的黏聚力和内摩擦角劣化统计规律,并基于此提出了一种考虑岩土体力学参数自然劣化规律的双折减系数强度折减法和综合安全系数计算方法。标准边坡和实例边坡的计算结果表明,所提出的双折减系数强度折减法可以较好地反映边坡的实际安全稳定情况。
Strength reduction method for slope stability analysis provides a good thinking.In the traditional strength reduction method,the same reduction factor was used for the cohesion and internal friction angle of slope rock mass,but the soil mechanics parameters in the process of degradation have its natural law,which is not always a synchronous reduction,in other words,the thinking of synchronous reduction does not always meet the degradation law of the parameters of rock and soil mass itself.Based on this,taking clay slope as the research object,the paper focused on the natural degradation law of mechanics parameters caused by moisture content changes.The degradation laws of the cohesion and internal friction of clay under the moisture content changing situation were analyzed by collecting a large amount of experimental data,a strength reduction method based on double strength reduction factors and considering natural degradation rule of soil mechanics parameters was put forward,as well as a comprehensive safety factor calculation method.The results of standard slope and practical slope showed that the proposed strength reduction method based on double strength reduction factors could better reflect the actual security and stability of the slope.
出处
《工业建筑》
CSCD
北大核心
2017年第12期127-132,共6页
Industrial Construction
基金
国家自然科学基金重点项目(51439003)
国家自然科学基金资助项目(51679127)
湖北省自然科学基金重点项目(2015CFA140)
关键词
强度折减法
含水率
劣化
自然规律
双折减系数
综合安全系数
strength reduction method
moisture content
degradation
natural law
double strength reduction factors
comprehensive safety factor
