不同地层和滑坡推力分布对微型桩受力影响分析  

Influence of landslide thrust distribution and different stratum on force of micro-pilecomposite structure

作　　者：黄林[1] 江南[1] 冯君[1] 张俞峰 何长江 HUANG Lin;JIANG Nan;FENG Jun;ZHANG Yufeng;HE Changjiang(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学土木工程学院,四川成都610031

出　　处：《铁道科学与工程学报》2020年第3期592-600,共9页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(51178402)。

摘　　要：针对“八”字形顶板连接微型桩组合结构,采用有限元方法研究不同地层组合条件下微型桩组合支护体系加固分级开挖边坡的地震动力特性。研究结果表明:最不利情况下,静力开挖作用与地震作用微型桩组合结构的变形方式均呈现出整体向山体外侧弯曲的趋势,且地震作用下微型桩轴力值较大;滑床岩体性质越好,微型桩所受轴力越小;在滑坡推力作用下,微型桩轴力极值基本都出现在靠山体侧微型桩上,实际工程中可根据靠山体侧桩受力进行设计;对于具有同一地层组合结构的边坡,不同滑坡推力分布形式下微型桩轴力大小排序为:滑坡推力均匀分布>梯形分布>三角形分布。In view of the“eight”shape roof connected micro-pile composite structure,the finite element method was used to study the seismic dynamic characteristics of the graded excavation slope strengthened by the micro-pile composite structure under different strata conditions.The results show that under the most unfavorable conditions,the deformation mode of micro-pile composite structure under static excavation and seismic action tends to bend to the outside of the mountain as a whole,but the axial force of micro-pile under seismic action is larger.The better the rock mass property of sliding bed is,the smaller the axial force of the micro pile is.Under the action of the landslide thrust,the extreme value of the axial force of the micro pile basically appears on the micro pile on the side of the mountain.In practical engineering,the design can be carried out according to the force of that pile.Within the slope with same strata structure,according to the different forms of landslide thrust distribution,the axial force of micro pile is ordered as follows:Uniform distribution>ladder distribution>triangle distribution.

关 键 词：微型桩组合结构 数值模拟 不同地层组合 地震动力特性 滑坡推力分布 

分 类 号：TU473[建筑科学—结构工程]