高速公路隧道洞口浅埋段施工中的双侧壁导坑法

Double-Sidewall Tunnel Guide Method in Construction of Shallow Buried Section at the Entrance of Expressway Tunnel

结合中交广连高速公路罗家营隧道洞内浅埋段工程,施工中采取地表回填注浆预加固及选用双侧壁导坑法开挖掘进,并借助先墙后拱法进行前期支护、借助超前小导管对围岩进行支护。施工人员依照勘测报告及时修改设计方案,最终提升了工程质量。

Combined with the shallow buried section of Lluojiaying tunnel on Guanglian expressway,this paper adopts the surface backfill grouting pre-reinforcement and selects the double-wall guide method for excavation,and carries out the preliminary support with the help of the wall before the arch method,and carries out the surrounding rock support with the help of advance small conduit.According to the survey report,the construction personnel timely revised the design scheme,and finally improved the quality of the project.