Experimental study on evolution law for particle breakage during coal and gas outburst
Xin Wu1
Yawen Peng2
Jiang Xu3
Qiao Yan2
Wen Nie4
Tingting Zhang2
1.College of Engineering, Sichuan Normal University,Chengdu 610101, China;College of Resources and Environmental Science, Chongqing University, Chongqing 400030, China2.College of Engineering, Sichuan Normal University,Chengdu 610101, China3.College of Resources and Environmental Science, Chongqing University, Chongqing 400030, China4.Quanzhou Institute of Equipment Manufacturing, Haixi Institutes, Chinese Academy of Sciences, Quanzhou 362000,China
摘要：Coal and gas outburst is a dynamic phenomenon in underground mining engineering that is often accompanied by the throwing and breakage of large amounts of coal.To study the crushing effect and its evolution during outbursts,coal samples with different initial particle sizes were evaluated using a coal and gas outburst testing device.Three basic particle sizes,5-10 mesh,10-40 mesh,and 40-80 mesh,as well as some mixed particle size coal samples were used in tests.The coal particles were pre-compacted at a pressure of 4 MPa before the tests.The vertical ground stress (4 MPa) and the horizontal ground stress (2.4 MPa) were initially simulated by the hydraulic system and maintained throughout.During the tests,the samples were first placed in a vacuum for 3 h,and the coal was filled with gas (CH4) for an adsorption time of approximately 5 h.Finally,the gas valve was shut off and the coal and gas outburst was induced by quickly opening the outburst hole.The coal particles that were thrown out by the outburst test device were collected and screened based on the particle size.The results show the following.(1) Smaller particle sizes have a worse crushing effect than larger sizes.Furthermore,the well-graded coal particles are weakly broken during the outburst process.(2) As the number of repeated tests increases,the relative breakage index grows;however,the increment of growth decreases after each test,showing that further fragmentation becomes increasingly difficult.
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论文发表日期：2020-03-30
在线出版日期：2025-08-15（本平台首次上网日期，不代表文献的发表时间）
页数：10( 97-106 )
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