摘要
Abstract
In view of the outstanding problems caused by without timely collapsing of the hard roof and floor of overlying rock in the 18503 working face of a mine,which leads to the outburst of the roof and floor and two sides of the working face,the deep hole blasting roof cutting and pressure relief technology and its supporting construction technology were proposed by combining theoretical analysis and field practice.The working principle of the deep hole blasting roof cutting and pressure relief technology was analyzed,the FLAC3D mechanical model was established in combination with the actual formation pa-rameters,and the appropriate parameters of deep hole blasting roof cutting were obtained,and the blast holes were arranged in a single row along the 18503 roadway,with a roof cutting height of 30 m,a blast hole spacing of 2 m,and an elevation an-gle of 90°.In addition,the blasting process of deep hole for roof cutting and pressure relief was explained,and the deforma-tion of the surrounding rock of the roadway and the inner wall of the blast hole were observed and peeped,and it was conclu-ded that the cracks in the roof were developed,the deformation of the roof and floor of the roadway and the two sides tended to be stable,the interlayer stress transmission of the roof of the roadway was weakened,and the deformation of the surround-ing rock was effectively controlled.The practical application results show that this technology can effectively ensure the long-term stability of the surrounding rock and supporting structure of the roadway in the mining area.关键词
切顶卸压/深孔爆破/超前动压/巷道顶板Key words
roof cutting and pressure relief/deep-hole blasting/advance dynamic pressure/roadway roof分类
矿业与冶金
