实测和规范荷载作用下地铁隧道二次衬砌的安全性对比分析

Safety Analysis on Secondary Lining of Subway Tunnel under Measured and Normal Load Comparative analysis

依托青岛地铁2号线五南区间隧道工程,采用现场监测方法得到浅埋花岗岩地铁隧道初期支护与二次衬砌间接触压力,然后结合铁路隧道设计规范计算作用于衬砌结构的计算荷载,采用荷载结构模型分别计算实测和规范荷载作用下的二次衬砌结构的安全系数并进行对比分析,得出实测荷载作用下二次衬砌的安全系数远高于规范荷载作用下的安全系数,为二次衬砌结构的设计提供了更加合理的建议。

Based on the project of Wu Nan interval tunnel of Qingdao Metro Line 2,the contact pressure between the initial support and the secondary lining of the subway tunnel was obtained by the on-site monitoring method.Then the calculated load acting on the lining structure was calculated by using the railway tunnel design code. Load structure model,the safety factor of the secondary lining structure under the actual measured load and the normal load is calculated and compared,and the safety factor of the secondary lining under the actual load is obtained,which is much higher than that of the normal load. The design of sub-lining structure provides a more reasonable suggestion.