【作者】 陈昌富； 秦海军； 朱剑锋；

【Author】 CHEN Chang-fu~1 Qin Hai-jun~1 ZHU Jian-feng~2 1.Geotechnical Engineering Institute of Hunan Univ,Changsha,Hunan 410082,China; 2.Geotechnical Engineering Institute of Zhejiang Univ,Hangzhou,Zhejiang 310027,China

【机构】 湖南大学土木工程学院； 浙江大学土木工程学院；

【摘要】 根据软岩边坡随深度风化程度逐渐变弱的特点,提出了边坡岩体强度参数随深度变化的确定方法,据此建立了考虑抗剪强度随深度变化(抗剪强度深度效应)的边坡稳定性分析极限平衡条分法.基于蒙特卡罗抽样思想,提出了一种同时确定边坡最危险圆弧滑面及相应最小安全系数的随机搜索算法.最后通过算例对比分析了考虑力学强度参数沿深度递变前后的边坡临界滑面位置及最小安全系数的大小,结果表明:考虑抗剪强度参数沿深度渐变对边坡最小安全系数有较大影响.更多还原

【Abstract】 Based on the phenomenon that the weathering of rock mass gradually reduce with the increase of depth in soft rock slopes,a calculation method of strength parameters of soft rock mass with the increase of depth is proposed.A new limit equilibrium slice method of soft rock slope’s stability analyses is also presented taking account of the gradual increase of rock mass’s shear strength with the depth(depth effect of shear strength parameters).A random search algorithm is developed to locate the critical sliding surface and compute the corresponding stability safety factor of slopes based on Monte Carlo method.A case study is given to discuss the difference of critical sliding surfaces and minimum safety factors of slopes when considering and not consider- ing the gradual increase of rock mass’s shear strength with the depth.The analyses results show that the depth effect of shear strength parameters can lead to significant influence on minimum safety factors of slopes.更多还原