关键词: 深孔爆破, 切割天井, 掏槽爆破, 钻孔偏差, 施工方案

Abstract:

Deep-hole blasting is an effective way to cut the raise of the deep hole，but the borehole deviation has become an important factor to restrict the success of deep hole blasting.Based on the analysis of the borehole deviation and the existing problems in the scene in the 680 section of a gold mine in Shandong Province，the construction scheme is improved on the basis of the original design.Firstly，the three parameters，such as the compensation coefficient，the breaking angle and the free surface coefficient，are put forward to determine the location of patching holes and initiation sequence.Secondly，the methods of charging with different explosion brisance explosives and multiple blasts are used.Volume of emulsion explosives are used at the first detonation by manual charging，which have high explosive compression but low charging efficiency.The second detonation uses special modified granular anfo explosives by mechanical charging，greatly improves the efficiency of charging，and releases less poisonous gas. Finally，the three problems of serious borehole deviation，charging difficulties and insufficient segments of detonators were solved in the cutting raise blasting.The blasting test results are analyzed，which proves that the construction scheme is proved to be feasible，and it has certain guiding value for similar projects.

Key words: deep hole blasting, cut raise, cut blasting, borehole deviation, construction scheme