Discussion on problems from presplit blasting in actual construction

Based on the engineering practice of the side slope excavation of Dayanchi section within the road for the construction traffic of Guandi Hydropower Station, the problems such as the selection of blasthole distance for presplit blasting, and the rock ridge, the levelness of the presplit face, lower hole-making rate of the auxiliary blastholes after the presplit blasting, the blasting network for prespliting and blasting zone and the angle change of the presplit hole etc. are analyzed; for which the specific solutions are put forward herein as well.