杨房沟水电站导流隧洞施工安全监测

杨房沟水电站两条导流隧洞均布置在右岸,上游洞段为变质粉砂岩夹炭质板岩,下游洞段为花岗闪长岩。变质粉砂岩洞段围岩稳定性较差,对施工围岩安全有较大影响。为了保证开挖、支护施工的进度与安全,在导流隧洞及进出口边坡设立了围岩受力及变形监测系统。系统的实际运行表明,监测成果在隧洞开挖及支护施工中起到了重要作用,根据监测成果调整的施工方案确保了施工的顺利进行,保证了工期。对监测系统的方案设计、运行、调整以及资料分析、所发挥的作用进行了介绍,以期为类似工程监测提供参考。

Application of safety monitoring in diversion tunnel construction of Yangfanggou Hydropower Station

2 diversion tunnels of Yangfanggou Hydropower Station are all located at the right bank and the rock mass of upstream sections are metamorphic siltstone with carbonaceous slate, while downstream in granodiorite. The surrounding rock mass of metamorphic siltstone is poor in stability, affecting the construction safety. To ensure the safety of the tunnel excavation and support construction, a monitoring system on stress and deformation of surrounding rock mass was set in the diversion tunnel and on the inlet and outlet slopes. The practical operation of the system showed that the monitoring results played an important role in the tunnel excavation and support construction; the construction scheme adjustment according to the monitoring results ensured the smooth construction and schedule. This paper introduces the scheme design, operation, adjustment, data analysis and the role of the monitoring system to provide reference for similar projects.