煤层深孔聚能爆破控制孔作用机制研究

doi:10.13722/j.cnki.jrme.2017.1038

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Abstract This paper is concerned with the effect of control hole on the crack initiation and propagation under the cumulative blasting in coal seam. The propagation characteristics of explosive stress wave，the expansion characteristics of the main coal seam cracks caused by explosion，and the stress state and displacement characteristics of coal seam in the area around the control hole were investigated theoretically and numerically. The results demonstrated that the superposition of the incident compressive stress wave and the reflected tensile stress wave changed the stress field around the control hole and the main crack tip significantly and caused the directional expansion of main cracks and the formation of annular cracks around the control hole. In addition，the displacement compensation space provided by the control hole and the surface properties of the hole wall enhanced the tangential tensile stress between the coal particles on and around the control hole wall，which promoted the development and expansion of the radial cracks around the control hole. Furthermore，during the process of cumulative blasting and breaking，the combination of main cracks created by the explosion，the radial cracks and circumferential cracks around the control hole constitutes a large-scale fracture network under the effect of control hole. Besides，the deep-hole cumulative blasting tests were carried out to study the influence of presence and absence of control hole in coal seam on the degree of permeability increasing. The test results showed that the presence of control hole in coal seam under cumulative blasting improved significantly the permeability of coal seams. The increasing of the mean concentration of extracted gas in the area influenced by the control hole after blasting in the tests carried out in two different time periods are 1.78 and 2.48 times respectively that in the area without influenced by control hole.

Key words： blasting engineering cumulative blasting control hole crack propagation gas drainage

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	Articles by authors
	GUO Deyong1
	ZHAO Jiechao1
	ZHANG Chao1
	ZHU Tonggong2

Cite this article:

GUO Deyong1,ZHAO Jiechao1,ZHANG Chao1, et al. Mechanism of control hole on coal crack initiation and propagation under deep-hole cumulative blasting in coal seam[J]. , 2018, 37(4): 919-930.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2017.1038 OR http://www.rockmech.org/EN/Y2018/V37/I4/919

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