金安桥水电站坝基裂面绿泥石化岩体利用研究

Study on the Use of Fracture Chloritization Rock Mass in the Dam Foundation of Jin'anqiao Hydropower Station

金水桥水电站坝基裂面绿泥石化岩体在原位条件下具有较好的性状,总体为Ⅲ类岩体,经适当处理后可做高混凝土重力坝坝基。但在开挖中该岩体极易受扰动、松驰,为保证大坝安全在开挖时应禁止大药量爆破,并尽量减少开挖后的暴露时间;对建基面以下松驰岩体进行固结灌浆。

The damsite of Jin＇anqiao hydropower projrct distributes hard fractured massive basalt, with good engineering geology condition. It is the Ⅲ rockmass quality. According to the above description, the fracture chloritization rock mass can be used as dam foundation of high concrete gravity dam. This kind of rock mass can be disturbed easily by excavation, which results in its strength decrease, so it＇s important to take protective excavation and protections after excavation, furthermore, to renovate the slack rock mass through consolidation grouting.