摘要
在我国西部山区修建高速公路过程中常选择隧道方案,从而各类特长深埋、复杂地质条件下的隧道工程大量涌现,在施工过程中常出现各种隧道灾害。针对在建的都(江堰)-汶(川)公路龙溪隧道工程中频繁出现的围岩大变形而导致初期支护侵限现象,基于现场测试资料,采用地质分析法和连续介质力学分析法,准确的获取了左线试验段围岩大变形的主要成因:倾向隧道右侧的软岩地层在高地应力(作用方向近垂直岩层)作用下产生较大变形。
Mountain tunnels are deep buried with complicated geological conditions, various disasters have been encountred in their construction process. Large deformations of surrounding rocks often caused primary support intruding into the tunnel clearance. In order to reveal the genetic mechanism of the large deformations of surrounding rocks, a test section was set in Longxi left tunnel on Du-Wen highway. Based on the in-situ measurement data, by adopting geologic analysis incorporating finite element analysis, the main cause of the large deformation of surrounding rocks on the left line test section was revealed： under the action of high initial stresses, soft rock mass with large deformation tends to obliquely shift toward right.
出处
《现代隧道技术》
EI
北大核心
2009年第5期46-50,共5页
Modern Tunnelling Technology
关键词
龙溪隧道
大变形
成因机制
Longxi tunnel
Large deformation
Intruding into clearance
Load-structure method
Supporting structure
Mechanical behavior
