局部失稳条件下抗滑桩加固边坡的三维稳定性分析  

Three-dimensional stability analysis of slope reinforced by anti-slide piles under local instability condition

作　　者：钟军豪 杨小礼[1] ZHONG Junhao;YANG Xiaoli(School of Civil Engineering,Central South University,Changsha Hunan 410075,China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075

出　　处：《中国安全生产科学技术》2023年第8期108-115,共8页Journal of Safety Science and Technology

基　　金：中南大学中央高校基本科研业务费专项资金项目(2023ZZTS0034)。

摘　　要：为了解决当前研究忽视抗滑桩加固边坡局部失稳的问题,基于极限分析上限定理,提出地震力作用下抗滑桩加固边坡局部和整体失稳的三维稳定性分析方法。通过建立耦合桩基阻滑效应的三维旋转破坏机制,推导出功率平衡方程,进而结合强度折减法求解边坡安全系数的上限解。通过与现有实例及有限元计算结果的对比,验证提出方法的准确性。研究结果表明:局部失稳的引入可以得到更准确的安全系数上限解;最优桩位受边坡土体参数、几何形状和地震强度等因素的综合影响;给出地震作用下抗滑桩加固边坡的安全系数设计图表。研究结果可为地震易发区抗滑桩加固边坡的稳定性设计提供参考。To resolve the problem of ignoring the local instability of slope reinforced by anti-slide piles in the current research,based on the upper bound theory of limit analysis,a three-dimensional stability analysis method for local and overall instability of slope reinforced by anti-slide piles under seismic force was proposed.By establishing the three-dimensional rotational failure mechanism coupled with the anti-slide effect of pile foundation,the power balance equation was derived,and then the upper bound solution of slope safety factor was obtained by combining the strength reduction method.The accuracy of the proposed method was verified by comparing with the existing examples and finite element calculation results.The results show that the introduction of local instability can obtain a more accurate upper bound solution of safety factor.The optimal pile position is comprehensively affected by the factors such as slope soil parameters,geometric shape,seismic strength,etc.The safety factor design chart of slope reinforced by anti-slide piles under seismic effect is given.The research results can provide reference for the stability design of slope reinforced by anti-slide piles in earthquake-prone areas.

关 键 词：自然灾害及其防治 滑坡 边坡稳定性 抗滑桩 局部失稳 

分 类 号：X936[环境科学与工程—安全科学]