高地应力大变形顺层塌方段的隧道二次衬砌结构安全研究

Study on Safety of Secondary Lining Structure of the Tunnel in Bedding Collapse Section with High Ground Stress and Large Deformation

针对西南山区某铁路隧道高地应力软岩大变形顺层塌方段优化的初期支护、二次衬砌结构,通过ANSYS有限元分析软件,采用荷载-结构模型计算分析隧道D1K561+544~+552段二次衬砌结构内力受大变形顺层塌方影响的变化情况,并对计算结果进行整理,得出了不同工况下二次衬砌各监测点内力及安全系数变化情况,更好地保障了隧道塌方段施工期和运营期的结构安全。

In order to optimize the initial support and secondary lining structure of the bedding collapse section with high ground stress and large deformation of soft rock in a railway tunnel in the mountainous region in Southwest China,the ANSYS finite analysis software and load-structure model are used to calculate and analyze the variation of internal force of secondary lining structure in D1K561+544~+552 segment of the tunnel induced by large deformation and bedding collapse,and the calculation results are processed to determine the variation of the internal force and safety factor at the monitoring points of the secondary lining in different cases.This will better guarantee the structural safety of the tunnel collapse section during construction period and operation period.