Experimental study on permeability enhancement by combined action of control hole and directional control blasting in high gas and low permeability coal seam
(1. School of Safety Science and Engineering，Anhui University of Science and Technology，Huainan，Anhui 232001，China； 2. Key Laboratory of Mine Safety and High Efficient Mining Jointly Built by Province and Ministry of Education，
Anhui University of Science and Technology，Huainan，Anhui 232001，China)
Abstract：Aiming at the problem of the low utilization of blasting energy due to that the burst gap cannot expand well in the direction of the coal seam during the blasting increasing permeability of high gas low permeability coal seam，the experimental study of the composite effect of control hole and directional control blasting is carried out. According to the propagation law of explosion stress wave，the mechanical model of explosion stress wave propagation under the auxiliary action of control hole is established. The four groups of control holes with different apertures after blasting are compared and analyzed with the crack initiation and stress development law of one group without control holes，and the propagation law of bursting cracks and the amount of increase of stress peak are obtained. The self-built blasting test platform is used to carry out blasting similarity simulation test. The results show that in terms of crack propagation，when the control hole diameter is too small，the control hole has a weak effect on crack guidance，and the crack parallel to the coal seam between the blasting hole and the control hole is not obvious. With the increase of the aperture，the control hole's effect on the crack orientation is strengthened，a straight connecting burst crack is formed between the two holes，and the orientation effect is more obvious. In terms of stress，the stress peak on the blasting side of the control hole increases with the augment of the aperture，and the maximum percentage of increase is 40.4%. On the back of blasting side of the control hole，the stress peak increases first and then decreases as the aperture increases，that is，the surrounding stress field will have a maximum stress field as the aperture increases. The research results are applied to the directional controlled blasting of high gas and low permeability coal seams，which can effectively improve the blasting energy utilization rate and permeability of coal seam.
张 鑫1，刘泽功1，2，张健玉1，傅师贵1，乔国栋1，杨 帅1. 高瓦斯低渗煤层控制孔与定向控制爆破复合作用增透试验研究[J]. 岩石力学与工程学报, 2023, 42(8): 2018-2027.
ZHANG Xin1，LIU Zegong1，2，ZHANG Jianyu1，FU Shigui1，QIAO Guodong1，YANG Shuai1. Experimental study on permeability enhancement by combined action of control hole and directional control blasting in high gas and low permeability coal seam. , 2023, 42(8): 2018-2027.
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2023, Vol. 42 
