隧洞地表稳定性监测和计算分析.pdfVIP

第30 卷第12 期 岩 土 力 学 Vol.30 No.12 2009 年12 月 Rock and Soil Mechanics Dec. 2009 文章编号：1000－7598 (2009) 12 －3765 －06 隧洞地表稳定性监测及计算分析 1 2 1 1 贾剑青 ，王宏图 ，刘大鹏 ，安龙奇 （1.兰州交通大学 交通运输学院，兰州 730070 ；2.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，重庆 400044 ） 摘 要：李子坝隧洞埋深较浅，进出口围岩较软弱，隧洞上方房屋密布，且有一居民用水塔。根据工程实际，隧洞初期支护 采用超前管棚+工字钢架+喷射混凝土进行联合支护；隧洞底部灌浆并施作仰拱；二次支护采用钢筋混凝土直边墙半圆拱。为 确保施工安全及施工过程中地表建筑物的稳定，对隧洞稳定性进行理论计算，求得在此状态下，最危险断面处隧洞的稳定性 系数为 1.9；施工过程中对地表房屋、水塔、隧洞拱顶及边墙的变形及沉降情况进行监测。监测结果表明，地表建筑物沉降 量均较小；水塔沉降量小且各点下沉协调一致，则水塔不会倾倒；隧洞拱顶及边墙变形均较小。 关 键 词：隧道；稳定性；监测；沉降 中图分类号：U 45 文献标识码：A Monitoring and analysis of tunnel surface stability 1 2 1 1 JIA Jian-qing , WANG Hong-tu , LIU Da-peng , AN Long-qi (1. School of Traffic and Transportation, Lanzhou Jiaotong University, Lanzhou 730070, China; 2.Key Laboratory for the Exploitation of Southwestern Resources the Environmental Disaster Control Engineering, Ministry of Education, Chongqing University, Chongqing 400044, China) Abstract: The buried depth of Liziba tunnel is shallow, and surrounding rocks at entrance and exit are soft. Many houses and one water tower have been constructed over the tunnel. According to the engineering condition, the ahead ductile, I-steel and shotcrete are used in the first support, grounting and inverted arch are constructed at tunnel bottom, and the semicircular arch of reinforced concrete is used in the second lining. To ensure the construction safety and the building stability during construction, the stability of the most dangerous section is calculated, and the calculated stability factor is 1.9. The