风化花岗混合岩富水段隧道突泥涌水灾害研究

Research on the Disaster of Sudden Mud Water Gushing in Tunnels with Water-rich Section of Weathered Granite Mixed Rock

针对云南省某隧道在风化花岗混合岩富水段发生的突泥涌水事故,在对灾害成因及发展过程进行深入分析的基础上,提出针对性的灾害处治方案,并通过实际施工效果及后期监测量测对方案进行验证,主要结论如下:雨季集中降雨、地表汇水地形、围岩差异风化及水稳性差是诱发突泥涌水的环境因素;突泥涌水灾害发展迅猛,应急处治施工难以开展,应加强超前地质探测工作,以提前防范为主;处治方案应分轻重缓急有序开展,并遵循“排堵结合、综合治理”的原则,前期以排为主,后期以堵为主;帷幕注浆施工应适当加大注浆压力,并可考虑多次补注浆施工。

In view of the sudden mud water gushing disaster occurred in the water-rich section of weathered granite mixed rock in a tunnel in Yunnan Province,based on the in-depth analysis of the causes and development process of the disaster,the targeted disaster treatment scheme is put forward,and the scheme is verified by actual construction effect and later monitoring measurement.The main conclusions are as follows:concentrated rainfall in rainy season,surface catchment topography,differential weathering of surrounding rock and poor water stability are the environmental factors that induce the sudden mud water gushing.With the rapid development of the sudden mud water gushing disaster,it is difficult to carry out emergency treatment construction,therefore,advance geological exploration should be strengthened to prevent them in advance.The treatment plan should be carried out in an orderly manner according to priority,and follow the principle of′combination of drainage and plugging and comprehensive treatment′.In the early stage,drainage is the main treatment plan,and in the later stage,plugging is the main treatment plan.The grouting pressure should be appropriately increased in curtain grouting construction and multiple supplementary grouting construction should be considered.