岩溶隧道塌方形成机理及处治对策研究

The Study on the Formation Mechanism and Treatment Countermeasures of Karst Tunnel Collapse

岩溶隧道在施工过程中,极易因岩溶水的泄放、溶洞填充物的塌陷而改变围岩原有应力分布情况,诱发隧道掌子面产生塌方,对隧道施工安全造成极大的威胁。为避免岩溶隧道塌方引起的地质灾害,提高施工安全性。结合四方山岩溶隧道的工程实例,全面分析其工程特性,研究其塌方形成机理,针对基本稳定区、塌方影响区、塌方发生区分别制定岩溶隧道塌方处治对策,为类似研究工程提供参考。

The original stress distribution of surrounding rock is easily changed due to discharge of karst water and collapse of filler in karst cave during construction of karst tunnel,which leads to collapse of tunnel face and poses a great threat to tunnel construction safety.Combined with the engineering examples of Sifangshan Karst Tunnel,this paper comprehensively analyzed its engineering characteristics and studied its formation mechanism of collapse.Treatment countermeasures to karst tunnel collapse were made on fundamental stable region,collapse affected area and collapse occurrence area respectively,which could provide reference for similar projects.