洪家渡水电站面板堆石坝坝料开采爆破

Quarry blasting of filling material for concrete-facedrockfill dam of Hongjiadu hydropower station

洪家渡水电站是乌江梯级的"龙头"电站。电站大坝为混凝土面板堆石坝。坝体总填筑量为900.59万m3。填料的级配是保证坝体质量符合设计要求的关键因素。料场由于本身地质和周边环境问题,爆破施工难度大。经过试验和分析,确定了爆破的各种参数。实际爆破施工效果表明:所选择的参数基本合理,实际填料和筛分曲线基本上在设计的允许范围内,大块率低,安全性高,获得了较好的经济效益。

Hongjiadu hydropower station is with the master regulation reservoir for the cascade hydropower stations on the Wujiang river. The dam is a concrete-faced rockfill one and the total filling quantity is about 9 million m^3. The grade of embankment material is the key factor for the dam quality to meet the design requirement. Due to the geological condition and surrounding environment of the rock quarry pit, the blasting construction is difficult. Through test and analysis, the blasting parameters were determined. The practical blasting effectiveness demonstrated that the selected parameters were basically reasonable, the practical filling material and sieve-analysis curve were basically in the allowable scope of design, boulder rate was low and the safety was high. The good economic benefit was obtained.