单线隧道大变形双层套拱初期支护施工技术

On initial support construction technique for large deformation double-layer cover arch of single-line tunnel

为解决单线铁路隧道初期支护结构施工后所遇到的大变形问题,以丽香铁路中义隧道施工为例,对其变形规律进行统计分析,并通过分析数据,依据设计文件及相关的施工经验,结合现场地质情况,制定了切实可行的施工方案,从而有效控制初期支护变形。

In order to get rid of the large deformation after the initial support construction of the single-line tunnels,the paper undertakes the statistic analysis of the deformation rule by taking Zhongyi Tunnel along Lijiang-Shangrila Railway,and makes the feasible construction scheme by combining with the site geological conditions,so as to have the effective control over the deformation in the initial support.