溪洛渡水电站坝肩开挖技术

溪洛渡水电站拱坝对拱端边坡有比较明显的影响,在推力作用下,边坡向内有一定的变形。为了减少拱端推力对坝肩槽岩体的破坏,拱坝坝肩开挖难度大,但是要求高。施工中,通过采取调整布孔形式、装药量、优化网络、改进钻孔机械等措施,使坝肩槽开挖各项指标均达到要求。

Technology on Excavation of Dam Abutment,Xiluodu Hydropower Project

The arch dam of Xiluodu Hydropower Project obviously impacts the slope at the arch end. Under the thrust action, the slope is deformed inward in certain degree. To decrease damage of the roek mass in the dam abutment by the arch end, difficulty of the abutment excavation is increased. On the other hand, the abutment excavation is required highly in term of quality. Indicators of the dam abutment excavation satisfy requirement through such measures being taken as modification of blasting-hole arrangement, quantity control of explo- sive charge, optimization of the blasting network, and improvement of hole-drilling machinery in construction.