浅埋偏压大断面暗挖隧道施工力学行为数值模拟分析  

Numerical simulation analysis of construction mechanical behavior of shallow-buried bias tunnel with large cross section

作　　者：赵卫 师亚龙[2] 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)

机构地区：[1]中铁国际集团安哥拉分公司,四川成都610036 [2]中铁西南科学研究院有限公司,四川成都611731

出　　处：《山西建筑》2020年第4期122-124,共3页Shanxi Architecture

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.

关 键 词：大断面 三台阶法 中隔墙法 双侧壁法 

分 类 号：U455[建筑科学—桥梁与隧道工程]