地下泵房中导洞开挖安全监测控制方法

Safety Monitoring and Control Method for Excavation of Guide Tunnel in Underground Pump House

云南滇中引水石鼓水源工程的地下泵房为世界最大泵房,主泵房开挖222m×23.4m×48m,开挖量达24.37×104m3,围岩断层及小规模溶洞及溶蚀空腔发育,安全风险高,地下泵房中导洞施工安全监测是服务于开挖施工过程围岩变形控制,而开展的临时性安全监测,主要采取围岩收敛变形监测、施工期变形及支护受力监测等,通过安全监测为地下泵房中导洞开挖提供技术指导,保障施工人员、设备安全。

The underground pump house of Shigu Water Source Project in Yunnan and Yunnan Province is the largest pump house in the world.Excavation of main pump house amounts to 24.37×104m3.Surrounding rock faults and small-scale karst caves and dissolution cavities are well developed and therefore have high safety risks.Safety monitoring of construction of guide tunnel in underground pump house is a temporary safety monitoring which serves to control the deformation of surrounding rock during excavation construction.It mainly adopts monitoring methods such as convergence deformation of surrounding rocks,deformation during construction period and stress monitoring of support,and provides technical guidance for excavation of guide tunnel in underground pump house through safety monitoring to ensure safety of constructors and equipment.