摘要
基于边坡内部的应力-应变状态,提出边坡局部安全系数,采用强度折减系数法不断降低边坡局部安全系数较低区域的岩土体抗剪强度,模拟铁路边坡渐进失稳过程,对比整体强度折减条件下边坡局部安全系数的差异,并以均质、非均质边坡算例验证该方法合理性。结果表明:局部强度折减相较全域强度折减对应的局部安全系数的分布范围更合理;随着局部强度折减次数增加,两类边坡的位移变化规律一致,极限状态时均产生显著突变;坡体内局部安全系数随着折减次数增加逐渐减小,坡脚逐步向坡顶形成潜在滑动面;潜在滑动区域与非滑动区域内的局部安全系数分布差异明显,可直观揭示边坡临界滑动面的位置。
Based on the stress-strain state inside the slope,the local safety factor of the slope was proposed.The strength reduction coefficient method was used to continuously reduce the shear strength of rock and soil mass in the area with low local safety factor of the slope,and simulate the progressive instability process of the railway slope.The difference of local safety factor of slope under the condition of overall strength reduction was compared,and the rationality of this method was verified by calculating examples of homogeneous and heterogeneous slopes.The results show that the distribution range of local safety factor corresponding to local strength reduction is more reasonable than that of global strength reduction.With the increase of local strength reduction times,the displacement changes of the two types of slopes are consistent,and significant abrupt changes occur at the limit state.The local safety factor inside the slope gradually decreases with the increase of reduction times,and a potential sliding surface is gradually formed from the foot of the slope towards the top of the slope.There is a significant difference in the distribution of local safety factors between the potential sliding area and the non-sliding area,which can intuitively reveal the location of the critical sliding surface of the slope.
作者
胡金山
HU Jinshan(China Railway First Survey and Design Institute Group Co.Ltd.,Xi’an 710043,China)
出处
《铁道建筑》
北大核心
2023年第5期140-144,共5页
Railway Engineering
关键词
铁路边坡
局部安全系数
强度折减
渐进破坏
数值计算
railway slope
local safety factor
strength reduction
progressive destruction
numerical calculation
