基于抗滑桩强度和桩位因素对边坡稳定性影响研究  

Anti-slide pile strength and pile position factor-based study on safety and stability of slope

作　　者：王晓芳 夏玲琼[2] WANG Xiaofang;XIA Lingqiong(Hunan Urban Construction College, Xiangtan 411101,Hunan, China;Hunan University, Changsha 410082, Hunan, China)

机构地区：[1]湖南城建职业技术学院,湖南湘潭411101 [2]湖南大学,湖南长沙410082

出　　处：《水利水电技术》2020年第8期152-158,共7页Water Resources and Hydropower Engineering

基　　金：国家重点研发计划(2018YFC0407102);2018年度湖南省普通高校青年骨干教师培养项目。

摘　　要：本文结合FLAC^3D软件对抗滑桩加固边坡工程进行数值模拟,并结合强度折减法拟定了边坡滑面的失稳判据。以此为重点探讨抗滑桩的布设位置、桩长、弹性模量等因素对边坡整体稳定系数、滑移面的影响。研究结果表明:最优设桩位置受桩长的影响较大。总的来说,抗滑桩设置在边坡滑面的中上部可提升边坡滑面的安全稳定性。另外,抗滑桩的位移方向对桩身受力和形变也影响较大,可采取抗滑桩向边坡中上部偏移和取适当的嵌固深度的办法来综合提升边坡稳定系数,而对于抗滑桩的弹性模量取值偏大虽能提高抗滑桩的抗挠度,但会增加工程的施工成本,且不能提高边坡滑面的稳定性。因此,需合理选取抗滑桩的弹性模量值。A numerical simulation is made on the anti-slide pile slope reinforcement project by means of the FLAC^3D software,and then the instability criteria of the slipping plane of slope is established in combination with the strength reduction method.On the basis of this,the influences from the factors,i.e.the layout position,the pile length,elastic modulus,etc.of anti-slide pile on the overall stability coefficient of slope are emphatically discussed herein.The study result shows that the optimal pile position is directly affected by the pile length.Generally speaking,the safety and stability of the slipping plane of slope can be improved through arranging anti-slide piles on the mid-upper part of the slipping plane of slope.Additionally,the displacement direction of the anti-slide pile also has a great influence on the stress and deformation of pile body,for which the method of laterally shifting anti-slide piles toward the mid-upper part of slope and adopting appropriate embedded depths of them for comprehensively enhancing the slope stability coefficient.However,although the anti-deflection degree of anti-slide pile can be increased by a larger value of elastic modulus taken for the anti-slide pile,the construction cost is to be increased yet,while the stability of the slipping plane of slope cannot be enhanced as well.Therefore,the elastic modulus of anti-slide pile is necessary to be reasonably selected.

关 键 词：边坡加固 边坡稳定性 桩位 数值分析 弹性模量 

分 类 号：U213.1[交通运输工程—道路与铁道工程]