猴子岩水电站导流洞泥洛堆积体段的施工方法及体会

Construction Method and Experience for Mud Deposit Section of Diversion Tunnel at Houziyan Hydropower Station

猴子岩水电站导流洞位于大渡河左岸,开挖最大断面为16.5 m×18.25 m,长度约为2 km。隧洞出口位于大型泥洛堆积体上中部,岩体破碎、抗压强度极低且地下水发育。施工中采用光面爆破、超前支护等控制围岩稳定的施工方法,利用超前地质预报、围岩监控量测等信息化手段指导施工,确保了安全施工和进度。本工程已于2011年4月底实现导流洞成功分流并经历了一个汛期考验,至今运行情况良好。

The diversion tunnel of Houziyan hydropower station was located in the left bank of Dadu River,the largest excavation section was 16.5m×18.25m with about 2km in length.The tunnel outlet was situated in the middle part of the large mud deposit with a typical soft rock characteristics of broken rock mass,low compressive strength and developed groundwater.The smooth blasting method and advanced support method were used during the construction to ensure the stable surrounding rocks.In addition,informationized means as advanced geological forecast and surrounding rock monitoring measurements were used to ensure the construction of the soft rock geological tunnel section to be fast and safe.The whole project had achieved successfully water diversion from diversion tunnel in the end of April of 2011.Experiencing test in one flood season,the project has been running well till now.