大跨度地下空间支护体系应力监测与稳定性分析  

STRESS MEASUREMENT AND STABILITY ANALYSIS OF SUPPORT SYSTEM OF LARGE-SPAN UNDERGROUND SPACE

作　　者：贾剑青[1] 王宏图[1] 李晓红[1] 胡国忠[1] 李慧民[1] 李开学[1] 

机构地区：[1]重庆大学西南资源开发及环境灾害控制工程教育部重点实验室

出　　处：《岩石力学与工程学报》2006年第z2期3667-3672,共6页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金重点项目(50334060);国家自然科学基金资助项目(50474025);国家重点基础研究发展规划(973)项目(2005CB221502);教育部"春晖计划"项目;重庆大学大学生创新基金资助项目

摘　　要：监控量测是隧道新奥法设计与施工中必不可少的环节。结合重庆市轻轨较新线大坪车站大跨度地下空间施工支护体系受力和应力监测的工程实践,分析支护体系初期支护工字钢拱应力、锚杆轴力、喷射混凝土内应力、喷射混凝土与围岩接触压力、临时工字钢支撑应力、喷射混凝土与二次衬砌接触压力、二次衬砌钢筋应力等测试结果和变化规律,阐述大跨度地下空间支护结构及参数选择、量测方法及测试手段,并确定支护体系的稳定性和结构的安全性,其结果指导该工程的信息化施工。Monitoring and measurement are necessary procedures in the design and construction of tunnel when using new Austrian tunneling method(NATM).Combined with the pressures on the supporting system and with monitoring of stress and pressure in the large-span underground space of Jiaochangkou—Xinshancun line of Chongqing Light Railway,the experimental results are analyzed and the undetermined laws are disclosed such as pressure of initial supporting I-steel,axial stress of bolt,shotconcrete stress,contacting pressure between shotconcrete and surrounding rocks,supporting pressure of temporary I-steel,contacting pressure of shotconcrete and the secondary lining,and stress of steel of the secondary lining.The methods of choosing the supporting system and structural parameters,the excavation methods of underground space,and the measuring methods and testing methods,are proposed.The stability of supporting system and safety of the structure are determined,and the achieved results can provide references to the information construction in engineering practice.

关 键 词：隧道工程 大跨度 新奥法 地下空间 支护体系 应力监测 稳定性 

分 类 号：U45[建筑科学—桥梁与隧道工程] TU459+.4[交通运输工程—道路与铁道工程]