小山电站调压井开挖施工技术

Excavation of surge shaft in Xiaoshan water power station

小山电站为松江河梯级电站中一级引水式水电站，其调压井的开挖是从原地面到高程 678 m平台的明挖和高程 678 m平台以下的暗挖。文中介绍了小山电站的调压井开挖施工技术。

Xiaoshan water power station is a first step in Songjianghe cascade hydropower station, which is a pressure flow diversion type hydropower station. The surge shaft construction comes down to open earth－ rock cut from original ground to 678 m levels and to underground rock cut of under 678 m levels. The paper introduces the project general situation, the geological condition and the excavation technique of the surge shaft construction as emphases.