PBA工法中边桩参数对结构稳定性的影响研究  

Influence of Side-pile Parameters of PBA Construction Method on Structural Stability

作　　者：刘军[1] 荀桂富 章良兵[1] 陈昊祥 

机构地区：[1]北京建筑大学土木与交通工程学院,北京100044

出　　处：《铁道标准设计》2016年第9期118-122,共5页Railway Standard Design

基　　金：北京市自然科学基金项目;北京市教育委员会科技计划重点项目(KZ20131001601);北京市属高等学校创新团队建设与教师职业发展计划项目

摘　　要：以北京地铁6号线北海北站工程为背景,采用FLAC3D数值模拟的方法,研究不同的边桩嵌入深度和边桩直径下地层沉降、边桩水平位移和洞底塑性区的规律。研究分析表明:地表沉降和边桩水平位移随着边桩嵌入深度的增加而减少;当嵌入深度一定时,不同边桩直径下对边桩水平位移的影响大于对地表沉降的影响;嵌入深度与洞底塑性区特性具有明显关系,嵌入深度小会使洞底、洞顶土体产生较大塑性区。With reference to BEIHAI North Station project of Beijing metro line 6, the settlement of stratum, horizontal displacement of side-pile and plastic zone of the tunnel bottom are analyzed at different embedded depths and diameters of side-piles with the numerical method of FLAC3D. The results show that the settlement of surface and horizontal displacement of side-pile decrease with the increase of the embedded depth of the side-pile; when the embedded depth of side-plies is fixed, the influence on the side-pile horizontal displacement generated by varying diameter of side-pile is greater than the influence on surface settlement; the close relation between the embedded depth and the bottom plastic zone suggests that shallow embedded depth generates bigger plastic zone in the tunnel top soil mass.

关 键 词：地铁车站 PBA工法 数值模拟 地表沉降 边桩水平位移 塑性区 

分 类 号：U231.4[交通运输工程—道路与铁道工程]