砂土与岩溶交界面盾尾注浆诱发溶洞破坏的极限平衡分析  

Limit Equilibrium Analysis of Destruction of Karst Cavern Caused by Shield Tail Grouting Near the Interface of Karst Cavern Covered by Sandy Strata

作　　者：崔庆龙[1] CUI Qinglong(CCCC Second Highway Consultants Co Ltd,Wuhan 430056,China)

机构地区：[1]中交第二公路勘察设计研究院有限公司,湖北武汉430056

出　　处：《土木工程与管理学报》2022年第6期77-82,共6页Journal of Civil Engineering and Management

基　　金：中交集团重大科技项目(2018-ZJKJ-09);新疆维吾尔自治区重大科技专项项目(2020A03003-3)。

摘　　要：在上覆砂土岩溶地层界面附近进行盾构隧道施工的过程中,当盾尾注浆压力达到一定值,应力传递至溶洞会诱发灰岩中溶洞的洞口张开,砂土随着浆液流入溶洞内,致使溶洞变形甚至破坏。基于极限平衡理论,推导了盾尾注浆诱发溶洞洞口张开破坏的理论模型;将盾尾注浆压力简化为环向均布力,基于半无限弹性平面内圆孔受均布力的Verruijt复变函数解答,推导出溶洞洞口张开量的计算公式,并基于该公式得到临界盾尾注浆压力。结果表明:临界盾尾注浆压力随溶洞与隧道垂直距离的增大而减小,随着隧道直径的增大而增大,随着隧道埋深的增大而减小。利用溶洞洞口张开量的计算公式,给出了某区间隧道施工的临界盾尾注浆压力。During shield tunnelling near the interface of karst cavern covered with sandy strata,it was suggested that if the shield tail grouting pressure reached a certain value,cracks would develop near the karst cavern and sand would flow into the cavern along with grouting slurry,which lead to deformation and even destruction of the karst cavern.In this study,a theoretical destruction model of karst cavern caused by grouting was formed based on limit equilibrium theory.And the equation of the opening of karst carven to calculate the critical grouting pressure was summarized by simplifying the grouting pressure as circumferential uniform force and employing the theoretical solution of Verruijt complex function.The results show that the critical shield tail grouting pressure decreases with the increase of vertical distance between cavem and tunnel,increases with the increase of tunnel diameter,and decreases with the increase of tunnel depth.The critical shield tail grouting pressure is given based on formula for calculating the opening amount of cavern.

关 键 词：盾构隧道 注浆压力 溶洞破坏 极限平衡分析 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]