通省隧道大变形围岩松动圈测试与分析

Test and Analysis on Loose Circle of Surrounding Rock to Large Distortion Region of Tongsheng Tunnel

隧道的稳定性是隧道设计与施工的重中之重,直接影响隧道在施工和以后使用的安全问题,而围岩松动圈又是分析隧道稳定性、进行支护结构设计的一个重要因素,针对特长公路隧道通省隧道施工过程中出现的围岩大变形,采用超声波测试技术对隧道大变形段的围岩松动圈进行探测,同时对松动圈厚度进行了理论验证,理论计算结果与超声波测试结果基本一致,为支护结构的优化设计、有效控制隧道大变形提供了依据和指导。

The stability of the tunnel is the top priority of the design and construction of the tunnel,because it directly affects the tunnel safety in construction.And the thickness of loose circle is a very important factor for analyzing tunnel stability and design of support structure,Aiming at the large distortion during the excavation of the long highway tunnel in the Tongsheng tunnel construction,this paper applies the ultrasonic wave method to the test of loose circle.Meanwhile,it verifies the thickness of loose circle by theoretical calculation,the theoretical calculation result and ultrasonic testing results are basically the same,and so the test result provides reference and guidance for the optimizing design of the support structure and effective control of large deformation of the tunnel.