摘要
Abstract
Taking a tunnel in weak surrounding rocks as an example,the influence of different advanced support re-inforcement forms on the tunnel structure and excavation face stability were analyzed by numerical simulation.The different reinforcement forms were compared and analyzed.The analysis results indicate that when the distance be-tween the surface grouting reinforcement and the tunnel arch is close to 1.2 m,the control effect on the settlement of the tunnel arch is significantly improved;The thicker the pipe shed support reinforcement area,the better the con-trol effect on tunnel arch settlement;Under the surface grouting reinforcement,pipe shed support reinforcement and combined support,the extrusion deformation trend of the excavation face is basically the same,with the maximum extrusion deformation value in the middle;Under the combined support,the vertical extrusion deformation value in the middle of the excavation face is the smallest,which is reduced by about 38.5％,27.3％,and 9.1％compared with unsupported,surface grouting reinforcement and pipe shed reinforcement respectively;On the same horizontal line,the lateral extrusion deformation value of the excavation face is basically the same.At the place 3 m from the tunnel excavation section to the tunnel face,the length of the lateral extrusion stable deformation value in the middle of the face is longer.While at the place 6 m,the length is shorter.The relevant research results can provide reference for the support of tunnels in weak surrounding rocks.关键词
隧道/软弱围岩/超前支护/加固形式/掌子面Key words
tunnel/weak surrounding rock/advanced support/reinforcement form/excavation face分类
交通工程
