十房高速通省隧道变形破坏原因分析

Analysis on Deformation and Failure Mechanism of Tongsheng Tunnel in the Shifang Highway

十房高速通省隧道围岩是具有一定倾角片理面的武当群片岩,在隧道施工过程中左洞ZK114+473桩号附近左拱腰部位出现钢拱腰压断现象。针对这一现象,在大量工程地质资料和现场调查的基础上,结合室内实验结果,综合分析了其变形破坏机理;并利用通用离散元程序UDEC进行隧道开挖后的力学特性和变形特性分析,得出在片岩岩性、片理面倾角和隧道偏压效应共同作用下在拱腰处产生的拉应力是隧道拱腰部位容易产生变形破坏的主要原因,对隧道的开挖和支护具有一定的指导意义。

Country rock of Tongsheng tunnel on the Shifang highway is a kind of Wudang group schist, it ap-pears phenomenon of large deformation even destruction repeatedly in the arch waist position in the process of con-struction. In response to this phenomenon, deformation mechanism is analyzed in the integrated manner on the basisof a large number of engineering geological data and investigation on the site and experiment in the room, and themechanical properties and deformation properties is also analyzed in way of common discrete element UDEC. Theresult shows under the influence of schist property, schistosity loft, bias effect,the tensile stress takes place on thehance in the country rock , that is the internal reason of easily damage on the hance, which has some significance tothe tunnel excavation and support.