隧道竖井初期支护钢拱架快速施工方法及受力特性研究

Mechanical Characteristic and Rapid Construction of the Steel Arch Frame in Tunnel Shaft Initial Support

公路隧道钢拱架的架设方式以及受力特征是公路隧道竖井初期支护建设的关键。以云南省墨江至临沧高速公路泰和隧道为研究对象,提出采用开口箱型挂钩安装钢拱架的快速施工方法,研究楔形块对控制围岩变形的作用,研究结果表明:采用开口箱型挂钩安装钢拱架,提高了竖井施工的工作效率,降低了施工的时间成本,楔形块能够较好地控制围岩的变形。研究结果为竖井初期支护钢拱架快速施工提供了参考。

The erection mode and stress characteristics of steel arch frame in highway tunnel are the key points of initial support construction of highway tunnel shaft.Taking the Taihe tunnel of the Expressway from Mojiang to Lincang in Yunnan Province as the research object,the rapid construction method of installing steel arch frame with open-box hook was proposed,and the effect of wedge blocks on controlling surrounding rock deformation was studied.The analysis results show that:the using of opening box hook improves the working efficiency of shaft construction and reduces the time cost of construction in installing the steel arch.The deformation of surrounding rock could be controlled better by using wedge block.The research results provide a reference for the rapid construction of steel arch support in the initial stage of shaft.