摘要
以探究岩溶裂隙发育区隧道塌方冒顶诱因及控制为目的,优化大规模岩溶裂隙发育区的冒顶灾害防控措施。依托贵州贤昌隧道泄水洞冒顶实例,采用地质测绘、物探等方法,深入剖析灾害诱因。研究发现,隧道病害段围岩极为破碎,裂隙水广泛赋存且上方一隐伏溶洞蕴藏大量软弱黏土发育至山体表面,加之隧道穿越岩溶裂隙发育区时施工工法未及时调整,在上述因素综合作用下,最终诱发隧道大范围冒顶灾害。故提出“洞顶隔水黏土回填+多段循环清淤+临时止浆墙+超前大管棚+径向注浆”的综合处治方案。经后期隧道监测验证,该处治方案效果良好,可有效保证隧道施工安全。
With the purpose of exploring the causes and control of tunnel collapse and roof fall in karst fissure development area,the prevention and control measures of roofing disaster in large-scale karst fissure development area are optimized.Relying on the roof falling example of Guizhou Xianchang Tunnel water discharge hole topping,the causes of the disaster are analyzed by using geological mapping,physical exploration and other methods.The study has found that the tunnel disease section of the surrounding rock is extremely broken with widespread of fissure water.Moreover,a hidden karst cave above contains a large number of weak clays that has developed to the surface of the mountain.In addition,the construction method of the tunnel crossing the karst fissure development area is not adjusted in a timely manner.Under the comprehensive effect of the above factors,the tunnel roofing disaster is ultimately triggered on a wide scale.Therefore,a comprehensive treatment program is proposed,which includes“water-insulating clay backfill on the roof of the cave,multi-stage cyclic dredging,temporary slurry wall,large pipe scaffolding in front of the tunnel,and radial grouting”.The later tunnel monitoring verification shows that the treatment program is effective,and effectively ensures the safety of tunnel construction.
作者
赵宗波
谢永福
杨方林
王大兵
李洲
ZHAO Zongbo;XIE Yongfu;YANG Fanglin;WANG Dabing;LI Zhou(Guizhou Bridge Construction Group Co.,Ltd.,Guiyang 550001,China;Guizhou Provincial Traffic Construction Engineering Quality Supervision and Law Enforcement Detachment,Guiyang 550001,China)
出处
《交通科技》
2023年第6期110-114,共5页
Transportation Science & Technology
基金
国家自然科学基金(51978671)
贵州省交通运输厅科技项目(2020-123-016)资助。
关键词
隧道工程
岩溶裂隙
冒顶坍塌
防控措施
tunnel engineering
karst fissure
roof collapse
prevention and control measures