削坡法对地形偏压隧道作用效果分析

Analysis on Effect of Slope Cutting Method on Topographic Bias Tunnel

在隧道开始施工后,由于偏压所造成的问题将变得非常被动并可能导致重大安全事故。一般来说,当隧道洞口存在山体偏压时,应在开挖之前对山体进行详细测量,并采取必要的技术措施[1-2]。现以回头沟隧道工程实例为依托,对削坡之前、削坡5°、削坡10°三种工况进行分析,通过采用FLAC3D数值模拟的方法分析不同削坡角度对地形偏压隧道所产生的影响。削坡可以减小隧道埋深,减小坡角,从而减小偏压对隧道所产生的不良影响[3-5]。

After the construction of the tunnel begins,the problems caused by the bias will become very passive and may lead to the major safety accidents.Generally speaking,when there is a mountain bias at the tunnel entrance,the mountain should be measured in detail before its excavation,and the necessary technical measures should be taken.Relying on the Huitougou Tunnel Project,three constructing conditions of before slope cutting,slope cutting by 5°and slope cutting by 10°are analyzed.The method of FLAC3 D numerical simulation is used to analyze the influences of the different slope cutting angles on the topographic bias tunnel.The slope cutting can reduce the buried depth of the tunnel and decrease the slope angle so as to reduce the adverse effects of bias on the tunnel.