富水超大断面隧道开挖方法比选研究

COMPARISON AND SELECTION OF EXCAVATION METHODS FOR WATER-RICH TUNNEL WITH SUPER LARGE SECTION

韶新高速公路的松山隧道穿越富水区域,开挖过程中出现了明显的涌水现象。基于该隧道地质的资料,利用有限元软件FLAC 3D分别模拟全断面法和上下台阶法2种开挖方法。研究结果表明:当水压较小时,宜采用全断面开挖法;当水压力较大时,宜采用上下台阶法施工。研究结论对富水超大断面隧道开挖方法的选择具有一定的参考意义。

The Songshan tunnel of the Shao-Xin expressway passes through a water-rich area,and there is an obvious water gushing phenomenon during the excavation process.In order to select a reasonable excavation method,based on the geological data of the tunnel,the finite element software FLAC 3D was used to simulate two excavation methods,the full face excavation method and the upper and lower bench method.The research results show that:when the water pressure is small,it is better to use the full face excavation method,and when the water pressure is high,it is better to use the upper and lower bench method for construction.The research conclusions have certain reference significance for the selection of excavation methods for water-rich tunnel with super large section.