高速公路隧道穿越溶洞段处治技术及监控量测分析

Analysis on processing technology and monitoring measurement for highway tunnel crossing karst section

结合梁忠高速公路礼让隧道岩溶段空腔与隧道的位置关系,将岩溶段划分为Ⅰ,Ⅱ,Ⅲ三段分别进行相应处治,并针对这三段增设监控量测断面进行周边收敛、拱顶下沉监测,结果表明:溶洞处治段围岩拱顶下沉量及周边收敛量都在隧道允许变形范围内,把倾斜状溶洞划分成三段分别进行处治的方法是可行的。

Combing with location relationship of cavity and tunnel at Lirang tunnel karst section of Liang-Zhong highway, the paper divides the karst section into Ⅰ, Ⅱ , Ⅲ phases and carries out corresponding treatment, carries out surrounding convergence and top arch subsidence monito-ring in light of setting monitoring measurement section on the above-mentioned three sections. Results show that ： surrounding rock top arch sub-sidence and surrounding convergence at karst processing sections are within the tunnel deformation domain ; the processing method of dividing in-clined karst into three sections is feasible.