大跨度小间距偏压隧道施工模拟

Construction simulation of bias tunnel with large-span small spacing

为了解决大跨度小间距偏压隧道施工工序和两隧道开挖时相互影响的问题,采用有限差分数值模拟方法对大跨度小间距偏压隧道进行了施工工序和空间效应的计算分析,结果表明不论采用哪种开挖方式,隧道受力均具有不对称性,中间夹岩和埋深较大一侧拱腰是应力集中区域,先开挖埋深较浅一侧更有利于围岩的稳定性。两隧道同时开挖时掌子面只要保持在一定的范围外,即可保证两隧道的相互影响较小。

In order to solve the problem of large - span bias tunnel construction process, and tunnels excavation influence with each other, the finite difference method was used to calculation and analyze the large - span bias small spacing tunnels construction process and space effect. The results show that whichever kind of excavation method, the tunnel stress have asymmetry, shared rock and the hence of large buried depth on one side is the stress concentration area, excavation shallow side first is more conducive to the stability of surrounding rock. When two tunnels were excavated at the same time , the tunnel face was beyond a certain range ,that the mutual influence of two tunnels was small.