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

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.