藏噶隧道2#横洞大变形段施工方案

Construction Scheme of 2# Transverse Gallery Large Deformation Section of Zangga Tunnel

文章通过对藏噶隧道2#横洞工区正洞地质条件、支护结构参数、施工情况等进行综合分析,初步得出变形的主要原因,采用超前地质预报手段,对掌子面前端围岩情况、地下水情况进行预判,以"放抗结合、尽快成环、减少扰动、量测指导"的原则,确定施工方案。

Through the comprehensive analysis of the geological conditions,supporting structure parameters and construction conditions of the 2# transverse gallery area of the Zangga tunnel,the main reasons for the deformation were obtained. Pre-judgment of the surrounding rock conditions and groundwater conditions at the front end of the tunnel face was carried out by means of advanced geological prediction methods,and the construction plan was determined by the principle of "disconnecting and combining,ring closing as soon as possible,reducing disturbance,and measuring guidance".