基于Spencer法的抗滑桩加固边坡地震稳定性分析  

Seismic Stability Analysis of Stabilizing Piles Reinforcement of Soil Slope Based on Spencer Method

作　　者：魏孔春 毛忠良 李绍红 时洪斌 WEI Kongchun;MAO Zhongliang;LI Shaohong;SHI Hongbin(China Railway Fifth Survey and Design Institute Group Co.,Ltd.,Beijing 102600,China;Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]中铁第五勘察设计院集团有限公司,北京102600 [2]西南交通大学,成都610031

出　　处：《路基工程》2024年第2期31-35,共5页Subgrade Engineering

基　　金：中国铁建股份有限公司科研计划项目:矩形桩机械成孔关键技术及装备研发(2023-B15);中铁第五勘察设计院集团有限公司科技项目科研计划课题:滑坡与抗滑桩体系变形时效规律与长期稳定性研究(T5Y2022-C04)。

摘　　要：针对抗滑桩加固边坡地震稳定性分析问题,根据拟静力分析和极限平衡理论,提出抗滑桩加固边坡地震稳定性分析的扩展Spencer法,得到桩身剪力与边坡稳定系数之间的关系曲线,进而确定满足指定稳定性设计安全系数要求的滑面处桩身剪力。通过实例分析表明:桩身剪力随水平和竖向地震影响系数的增大而增大,水平地震影响系数比竖向地震影响系数对桩身剪力影响显著,桩身剪力随桩位靠近坡顶呈非线性减小趋势。Aiming at the problem of seismic stability analysis of slopes reinforced by stabilizing piles,based on pseudostatic analysis and the theory of limit equilibrium,the extended Spencer method for seismic stability analysis of slopes reinforced by stabilizing piles is proposed.Based on this method,the curve of pile shear force and slope safety factor is received,and the shear force of the pile satisfying the specific design safety factor can be determined.The example analysis shows that the pile shear force increases with the horizontal and vertical seismic influence coefficients,and the pile shear force is more sensitive to the horizontal seismic influence coefficient than the vertical one.The shear force of the pile satisfying the specific design safety factor decreases nonlinearly with the pile position approaching the slope top.

关 键 词：抗滑桩 桩身剪力 拟静力分析 Spencer法 桩位 

分 类 号：U418.52[交通运输工程—道路与铁道工程]