摘要
分离式独立双洞之间的横通道开挖,再一次引起主隧道围岩和支护结构的应力释放与重分配,引起交叉段附近岩体与支护结构力学行为发生变化。结合高地应力区深埋隧道工程,通过3D弹塑性有限元数值仿真模拟,分析横通道不同施工方案和动态施工过程对主隧道围岩与初期支护结构力学行为的影响。分析结果显示,横通道的开挖对围岩应力和位移影响较大,对交叉侧主隧道侧壁初期支护应力及交叉对侧主隧道侧初期支护3σ和XY平面的剪应力影响较大。为深埋隧道交叉段监控量测系统的设计、施工方案优化及安全控制提供了依据。
Excavation of an intersection tunnel between independent double tunnels leads again to stress release and redistribution in the surrounding rock and the support structure of the chief tunnel,resulting in change of mechanical behavior of the rock mass and the supporting structure near the intersection.Considering deeply-buried tunnel engineering in high geo-stress areas,we analyzed the mechanical behaviors of the surrounding rock,the initial support system of the chief tunnel with different construction sche...
出处
《重庆建筑大学学报》
CSCD
北大核心
2008年第2期32-36,共5页
Journal of Chongqing Jianzhu University
基金
国家自然科学基金重点项目(No.50334060)
重庆市自然科学基金项目(CSTC
2006BB6167)
关键词
交叉隧道
围岩-支护结构
力学行为
数值模拟
intersection tunnel
surrounding rock-support structure
mechanical behaviors
numerical simulation