岩溶隧道衬砌抗落石冲击计算分析

Falling Rock Resistant Estimation on Tunnel Liner in Karstic Rock Caverns

在岩溶地区修建隧道,经常会遇到溶洞、暗河、突水、突泥等地质灾害,给施工带来巨大难度和工期损失。介绍了城(口)至万(源)快速公路通道八台山隧道施工过程中遇到的一处特大溶洞处治案例,通过计算确定衬砌厚度及洞顶防撞冲击缓冲层厚度,作为设计依据。实践证明:该计算切实可行,加快了溶洞处治周期,减少施工难度,为同类溶洞处治提供经验借鉴。

The common geological hazards in construction of tunnels in karst terrain are： karst rock cavern, underground river, groundwater gush and sudden mud flow etc. These hazards often induce significant difficulties and prolonged construction schedule. This paper presents a case history of mitigation measures used in a very large karst rock cavern in Chengkou to Wanyuan Expressway project. The tunnel liner consider the impact loading of from rock falls.