Time-dependent safety of lining structures of circular tunnels in weak rock strata  

作　　者：Baoguo Liu Yu Song Zhaofei Chu 

机构地区：[1]School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China [2]School of Civil Engineering,Wuhan University,Wuhan 430072,China

出　　处：《International Journal of Mining Science and Technology》2022年第2期323-334,共12页矿业科学技术学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.71631007 and 71771020)。

摘　　要：Following tunnel excavation and lining completion,fractured surrounding rock deforms gradually over time;this results in a time-dependent evolution of the pressure applied to the lining structure by the surrounding rock.Thus,the safety of the tunnel lining in weak strata is strongly correlated with time.In this study,we developed an analytical method for determining the time-dependent pressure in the surrounding rock and lining structure of a circular tunnel under a hydrostatic stress field.Under the proposed method,the stress–strain relationship of the fractured surrounding rock is assumed to conform to that of the Burgers viscoelastic component,and the lining structure is assumed to be an elastomer.Based on these assumptions,the viscoelastic deformation of the surrounding rock,the elastic deformation of the lining structure,and the coordinated deformation between the surrounding rock and lining structure were derived.The proposed analytical method,which employs a time-dependent safety coefficient,was subsequently used to estimate the durability of the lining structure of the Foling Tunnel in China.The derived attenuation curve of the safety coefficient with respect to time can assist engineers in predicting the remaining viable life of the lining structure.Unlike existing analytical methods,the method derived in this study considers the time dependency of the interaction between the surrounding rock and tunnel lining;hence,it is more suitable for the evaluation of lining lifetime.

关 键 词：Tunnel lining Surrounding rock pressure Rheological characteristics Weak rock strata Time-dependent safety 

分 类 号：U451.4[建筑科学—桥梁与隧道工程]