高速铁路隧道围岩大变形特征及机理分析

Large Deformation Characteristics and Mechanism Analysis about Surrounding Rock in High-speed Railway Tunnel

为研究高速铁路隧道围岩大变形的特征及其机理,以沪昆客运专线湖南段杨家隧道发生大变形塌方为工程背景,对隧道围岩大变形引起地表裂缝及初支侵限进行了介绍.选取隧道大变形里程段的典型断面设置多个监测断面,通过监控量测等手段对其灾变期变形特征展开了分析,在此基础上,从岩性、地质构造、围岩赋存环境三个方面分析了杨家隧道发生大变形的机理,能够为该隧道发生大变形后采取相应措施提供理论依据.

In order to study the large deformation characteristics and mechanism analysis about surrounding rock in high-speed railway tunnel, this paper took large deformation and landslides occurred in Yangjia Tunnel as the engineering background. Firstly, the ground surface fissures and contamination limit of primary support which triggered by surrounding rock in tunnel were introduced. Then the typical sections located in DK388＋015-DK388＋075 were selected to be analysed by monitoring measures, on this basis, we proposed the large deformation mechanism about Yangjia Tunnel from the aspect of lithology, geological structure and occurrence of surrounding environment. The research conclusions can provide theoretical basis when the measures are taking after large deformation occurred.