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.
出处
《铁道标准设计》
北大核心
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
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
Metro station
PBA method
Numerical simulation
Surface subsidence
Side-pile horizontal displacement
Plastic zone
