Research on mechanism of energy release and permeability improvement in coal strata by static blasting

doi:10.16265/j.cnki.issn1003-3033.2020.05.010

Abstract

Abstract: In order to address the problem of frequent coal and gas outburst in high-stress and low-permeability coal seams, a static rock fracturing mechanical model was set up, and process of fracturing was numerically simulated. Then, relevant parameters of crack timeliness, inflation pressure, layout of crack hole that affect fracturing effect were tested and analyzed, and research was carried out on mechanism of energy release and outburst prevention as well as permeability improvement by static blasting. The results show that ratio of swelling agent, inhibitor and water is 100∶8∶30, 100∶12∶30 and 100∶15∶30, and their onset time is 50, 30 and 100 min respectively. Among them ratio 2 has best expansion effect with maximum crack pressure of 150.8 MPa. Static blasting works as continuous tensile stress of cracking agent is greater than tensile strength of medium. Control holes can guide expansion of crack and enlarge its size. Moreover, static blasting can reduce accumulation of gas and stress potential and increase number of cracks in coal body, thus achieving purpose of energy release and permeability improvement through static blasting.

Key words: coal and gas outburst, static blasting, energy release and permeability improvement, fracture mechanics, crack timeliness

CLC Number:

X936
TD7

GUO Huaiguang, ZHU Likai. Research on mechanism of energy release and permeability improvement in coal strata by static blasting[J]. China Safety Science Journal, 2020, 30(5): 60-65.

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