甲米一级水电站闸坝及引水隧洞施工技术方案综述

Construction Technology Scheme for Gate Dam and Headrace Tunnel at Jiami I Hydropower Station

甲米一级水电站闸坝基础为砂卵石、粉细砂,引水隧洞1#、2#、3#支洞均处于泥石流冲沟内,安全隐患十分突出。隧洞岩性为砂岩、泥岩与页岩、炭质页岩,部分洞段夹煤层及煤线,节理裂隙发育,结构面多卸荷、微张,岩体完整性差,具碎裂结构,以IV、V类围岩为主。通过采取有效的施工技术方案,节省了工期,降低了工程成本。

Foundation of gate dam at Jiami I hydropower station consists of sand and gravel and silty sand. No. 1,No. 2 and No. 3 adits of headrace tunnel are located inthe debris flow gullies,so potential safety hazards are obvious. Rocks in tunnel aresandstone,mudstone and shale,calcareous shale. In some tunnel sections,coal seams and coal lines are interbedded. Joints and fissures are developed,structural plane are relaxed. Rock mass is not sound and is fractured. Most of surrounding rocks are classified as IV and V. By adopting effective construction technology scheme,construction period is shortened and project cost is reduced.