Blasting Trial and Analysis of Stone Quarrying for Rock-fill Dam in Guanyinyan Hydropower Station

The stone materials for the right-bank rock-fill dam of Guanyinyan hydropower station mostly comes from the excavation debris of right dam foundation or other parts,so the technical feature of this excavation is to both fulfill the excavation requirement and control the quality of rock-fill material.On analyzing the conditions of dam bedrock,six groups of field blasting trial with different blast parameters were carried out,and the characters of excavation slag lumpiness and gradation were analyzed to optimize excavation scheme of dam foundation,drilling-blasting parameters and construction technology.