For the blasting excavation work of the dam abutment slots in Yebatan Hydropower Station,pre-splitting blas-ting experiments are carried out in areas with similar rock characters and joint structures.Based on the experimental re-sults in blasting vibration,rock mass damage,and contour forming control,optimal blasting parameters are determined and applied in the abutment slot areas.The results show that with the main blasting hole spacing of 2.8 m×2.8 m,the buffer hole spacing of 2.0 m×2.8 m,the pre-splitting hole spacing of 0.7 m,and the line charge density of the pre-split-ting holes of 440 g/m,the blasting vibration and the rock mass damage can fulfill the requirements,and the contour forming performance is satisfactory.The results can be useful reference for the excavation blasting control of abutment slots.
关键词
坝肩槽开挖/爆破振动/岩体损伤/轮廓成型
Key words
excavation of dam abutment slots/blasting vibration/rock mass damage/contour forming
维普
万方数据