摘要
针对浅埋偏压大断面隧道开挖过程中风险较大,从常用的三种施工方法入手,对三台阶法、中隔墙法、双侧壁法等进行数值模拟分析,分别对其围岩应力、塑性区、初期支护结构内力、地表沉降、洞周位移等多个方面进行对比分析。研究结果表明双侧壁法开挖时,支护结构受力、变形及围岩变形、受力均最小,其次为中隔墙法,最不利为三台阶法开挖。
According to the larger risk during the excavation of shallow-buried bias tunnel with large cross section,this paper starts with three commonly used construction methods( three step method,middle-wall method and both side heading method) to numerical simulation analysis of surrounding rock stress,plastic zone,force of initial support structure,ground settlement and convergence. The result shows that: the most advantageous method is both side heading method,the second is middle-wall method and the most unfavorable is the three-step method.
作者
赵卫
师亚龙
Zhao Wei;Shi Yalong(China Railway International Group Angola Branch Chengdu 610036,China;Southwest Research Institute Co.,Ltd.of C.R.E.C.,Chengdu 611731,China)
出处
《山西建筑》
2020年第4期122-124,共3页
Shanxi Architecture
关键词
大断面
三台阶法
中隔墙法
双侧壁法
large cross section
three step method
middle-wall method
both side heading method
