黏性土滑坡抗滑桩结构稳定性分析  

Analysis on Stability of Anti-slide Pile Structure in Cohesive Soil Landslide

作　　者：张正伟 ZHANG Zhengwei(Zhongjiaotongli Construction Co.,Ltd.,Xi'an 710075,China)

机构地区：[1]中交通力建设股份有限公司,西安710075

出　　处：《路基工程》2024年第6期213-220,共8页Subgrade Engineering

摘　　要：以梧州至柳州高速公路某黏性土滑坡处治为例,分析滑坡的形成机理,利用摩根斯坦-普莱斯法计算得滑坡天然状态下的稳定系数为0.951,处于整体变形-滑动状态,以剩余推力法计算得滑坡下缘剪出口剩余下滑力为535.19 kN;建立FLAC3D滑坡模型,设置圆形抗滑桩和格宾挡墙,分析不同间距下圆形抗滑桩桩身承载特性,当间距在2.0d~2.5d(d为桩径)之间,桩间土拱效应最明显,综合分析确定2.0d(4.4 m)作为桩间距;根据圆形抗滑桩桩前和桩后的弯矩不等,桩截面采取非均匀配筋。Taking the treatment of a cohesive soil landslide in Wuzhou-Liuzhou Expressway as an example,the formation mechanism of the landslide was analyzed.The stability coefficient of the landslide in the natural state is calculated to be 0.951 by the Morganstein-Price method,which was in the overall deformation-sliding state.The residual sliding force at the shear opening of the lower edge of the landslide is calculated to be 535.19 kN by the residual thrust method.After FLAC3D landslide model is established,circular anti-slide piles and gabion retaining walls are set up to analyze the bearing characteristics of circular anti-slide pile under different spacing.When the spacing is ranging between 2.0d and 2.5d(d as pile diameter),the soil arching effect between piles is the most obvious.After comprehensive analysis,2.0d(4.4 m)is determined as the pile spacing;since there is an unequal front and rear bending moment on the circular anti-slide piles,non-uniform reinforcement is adopted for the pile cross section.

关 键 词：圆形抗滑桩 FLAC3D 方案设计 配筋计算 地层岩 

分 类 号：U416.163[交通运输工程—道路与铁道工程]