浅埋偏压双洞隧道数值模拟  

Numerical simulation of shallow buried biasing double-hole tunnel

作　　者：尤冬梅 徐林生[1] 陈皓 YOU Dongmei;XU Linsheng;CHEN Hao(College of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China)

机构地区：[1]重庆交通大学土木工程学院,重庆400074

出　　处：《中国科技论文》2020年第10期1132-1138,共7页China Sciencepaper

基　　金：重庆市教育委员会科学技术研究项目(KJQN201904004)。

摘　　要：为研究不同净距对浅埋偏压隧道开挖围岩应力分布的影响,以天鹅穴隧道浅埋偏压段为工程案例,运用ANSYS建立4组(净距分别为8、10、12.62、15.5 m)二维数值分析模型,对比分析左右洞各控制点的围岩应力分布及应力比值。结果表明:隧道施工对最初地层应力的扰动极为明显,两洞的左右墙脚及拱脚位置处应力值在各施工阶段有较大波动;两洞净距减小,左洞右拱脚水平方向应力增大,剪应力减小,且左洞应力集中现象突出,偏压效应偏大。As the study of different interval of shallow bias tunnel excavation surrounding rock stress distribution and the effect of the Swan hole shallow bias tunnel segment for engineering,the software ANSYS was used to establish four groups of two-dimensional numerical analysis model(with the net distance of 8,10,12.62 and 15.5 m)respectively.Comparison and analysis were conducted about the hole of each control point of surrounding rock stress distribution and stress ratio.The results show that the disturbance of tunnel construction on the initial ground stress is very obvious,and the stress value at the left,right and arch foot of the two holes fluctuates greatly in each construction stage.When the net distance between the two holes decreases,the horizontal stress of the right arch foot of the left hole will increase,while the shear stress will decrease,and the stress concentration phenomenon of the left hole is prominent with the relatively obvious bias effect.

关 键 词：浅埋偏压隧道 数值模拟 不同净距 围岩应力 

分 类 号：U451.2[建筑科学—桥梁与隧道工程]