【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。更多还原

【Abstract】 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.更多还原