摘要
以新疆地区某PBA法(浅埋暗挖洞桩法)地铁车站为工程依托,主要采用数值模拟的方法,结合对现场监测结果的分析对比,对地铁车站围护桩在不同施工阶段受力特点进行分析。研究结果表明:围护桩承载位移变化曲线在扣拱开挖和中板施作阶段增长速率较大,该阶段的轴力和水平位移占比分别为65%和72%;围护桩的承载位移变化曲线可以分三个阶段,即快速增长阶段、缓慢增加阶段、稳定持平阶段;围护桩桩径和桩间距对桩体水平位移影响较小,对轴力和弯矩影响较大,通过参数优化,可得到最优方案。
Based on a PBA subway station in Xinjiang,the numerical simulation method is mainly used.Combined with the analysis and comparison of the on-site monitoring results,the stress characteristics of the subway station retaining piles in different construction stages are analyzed.The results show that:The load-bearing displacement curve of the retaining pile has the higher growth rate during the arching excavation and the middle plate application stage,and the axial force and horizontal displacement accounted for 65%and 72%respectively;The bearing displacement curve of the retaining pile can be divided into three stages:rapid growth stage,slow increase stage,stable and flat stage;the pile diameter and pile spacing of the retaining pile have little influence on the horizontal displacement of the pile,and the axial force and The bending moment has a great influence.Through parameter optimization,the optimal scheme can be obtained.
作者
何宏伟
吴飞亚
张晋东
HE Hongwei;WU Feiya;ZHANG Jindong(National Experimental Teaching Demonstration Center of Civil Engineering(Lanzhou Jiaotong University),Lanzhou 730070,China;School of Civil Engineering,LanzhouJiaotong University,Lanzhou 730070,China)
出处
《现代交通技术》
2020年第5期87-92,共6页
Modern Transportation Technology
关键词
PBA法
围护桩
现场监测
数值模拟
参数优化
PBA method
retaining pile
on-site monitoring
numerical simulation
parameter optimization
