Study on the shatter proneness and its test method of coal with high-pressure adsorbed gas
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ISMSSE 2018
Study on the shatter proneness and its test method of coal with high-pressure adsorbed gas Hongwei Jin 1 & Qiaohong Gao 2 & Qinghua Zhang 3 & Gang Xu 1 & Shilei Yu 1 & Jie Zhou 1 Received: 24 March 2019 / Accepted: 8 August 2019 # Saudi Society for Geosciences 2019
Abstract Coal and gas outbursts usually generate a large amount of coal fragment of various sizes. This phenomenon is assumed to be related to the exploding and shattering of coal containing high-pressure adsorbed gas when it is suddenly exposed. To verify this assumption, a laboratory device has been developed to test the shatter proneness of coal blocks at high pressure. Experiments were conducted by using coal blocks sampled from four different mines. The experiments show that if the gas pressure is high enough, all coal blocks can be shattered. The particle size of the shattered coal follows the Weibull distribution. Under specific gas pressure, the shatter proneness of coal can be represented by the scale parameter in the Weibull distribution function derived from experiments. This parameter represents the susceptibility of outburst and may be used as one of the outburst predictive indicators in the future. Keywords Coal and gas outburst . Shatter . Shatter proneness . Particle size distribution . Weibull distribution
Introduction Coal and gas outburst and rockburst phenomena are all violent dynamic disasters that might occur in underground coal This article is part of the Topical Collection on Mine Safety Science and Engineering * Qiaohong Gao [email protected] Hongwei Jin [email protected] Qinghua Zhang [email protected] Gang Xu [email protected] Shilei Yu [email protected] Jie Zhou [email protected] 1
College of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
2
PowerChina Northwest Engineering Corporation Limited, Xi’an 710065, China
3
China Coal Technology Engineering Group Chongqing Research Institute, Chongqing 400039, China
mines. The main difference between them is that due to the existence of high-pressure adsorbed gas, outburst usually brings out a large amount of shattered coal, some of which has even been pulverized (Luo et al. 2018). This phenomenon does not occur in rockburst. It indicates that high-pressure gas plays a vital role in coal shatter during the outburst process. The majority of existing outburst mechanism theories, such as the spherical shell failure theory (Jiang and Yu 1998) and the mechanical failure theory (Hu 2007), are all further development of the comprehensive effect theory (Skochinski 1954) initially proposed by Skochinski. They all believed that outburst is primarily affected by stress, gas pressure, and coal properties. Most of them also agree that during the process of outburst, the gas which continuously desorbs and flows into pores and fractures has an extension effect on the pores and fractures, thus leading to the breakage of coal. Nie established a method to quantify the anisotropic characteristics of coal swelling deformation during the process o
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