Test study on rupture process and permeability properties of coal-rock in simulating mining stress effect

• Published in: Journal of coal science & engineering, China China, 2009, Vol.15 (1), p.55-60
• Main Authors: Gao, Bao-bin, Li, Hua-min, Qiao, Chun-sheng, Su, Cheng-dong, Wang, Wen
• Format: Article
• Language: English
• Subjects: Earth and Environmental Science; Earth Sciences; Geochemistry; Geology; Geophysics/Geodesy; Geotechnical Engineering & Applied Earth Sciences; Mechanical Engineering; 声发射监测; 渗透性能; 煤岩开采; 破裂过程
• ISSN: 1006-9097; 1866-6566
• DOI: 10.1007/s12404-009-0111-z

A test system was designed by using a set of self-made experimental devices of coupled coal-gas in simulating mining stress effect, combining the equipment with RMT-150B rock mechanical experimental system, monitoring the rupture process of coal-rock with an acoustic emission （AE） device and collecting gas-flow rate and gas-stress data in real-time automatically with a gas flow-meter and gas pressure sensor. The fracture process and permeability properties test of the coal-rock in mining stress effect was carried out. Test results indicate that AE events and variation of stresses have the same variance tendency and the rupture process of coal-rock can be monitored by AE. The relation curves among stresses, parameters of AE and permeability properties demonstrate that the permeability of coal-rock decreases gradually at quasi-elastic stage, increases gradually at plastic damage micro-fracture stage, rises suddenly near the peak point and has multi-variation at post-peak slip stage. From the results, such conclusion can be drawn that the variation of permeability can be monitored by AE parameters or stress change.