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

• 来源期刊: 煤炭学报（英文版）
• 年，卷（期）: 2009,（1）
• 页码范围: 55-60
• 页数: 6页
• 语种: 英文
• DOI: 10.1007s12404-009-0111-z

摘要

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 ef-fect 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 dem-onstrate that the permeability of coal-rock decreases gradually at quasi-elastic stage,in-creases 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.