隧洞洞脸高边坡被动防护网的施工方法研究

Study on Construction Method of Passive Protective Net for High Slope of Tunnel Face

一直以来,隧道边坡的安全防护施工是保证隧洞安全施工的重要前提。西藏某隧道进口地形较平缓,洞口工程地质附近隧道长约30m位于第四系全新统冲积砂层中,砂层自稳能力极差,风积砂层及冲洪积砂层为可液化砂土,工程地质条件较差。为保证隧道洞口施工人员及设备安全,在隧道进出洞口上方设置被动防护网,拦截下落的岩石,以起到良好的防护作用。通过理论数据与实际结果动态比较的方式,优化被动防护网的施工工艺,服务隧道安全防护问题。

Safety protection construction of tunnel slope has been an important prerequisite for safe construction of tunnel. A tunnel in Tibet has a relatively flat terrain, and the tunnel near the tunnel portal engineering geology is about 30 m long and is located in the fourth series new alluvial sand layer. The self-stabilizing ability of sand layer is very poor, and aeolian sand layer and alluvial sand layer belong to liquefiable sand, so the engineering geological conditions are poor. In order to ensure the safety of the construction personnel and equipment, the passive protective net is arranged above the entrance of the tunnel to intercept the falling rocks, so as to play a good protective effect. Through the dynamic comparison of theoretical data and the actual results, the passive protection network construction technology is optimized to serve the tunnel security protection.