Analysis of the pulsating development process of coal and gas outburst
XU Jiang
GENG Jiabo
PENG Shoujian
YUAN Mei
ZHANG Chaolin
LUO Xiaohang
Abstract：To study the laws of coal and gas outburst development mechanism,physical simulation tests of coal and gas outburst with different stress concentration factors were carried out.Impact force of coal and gas flow,pressure in outburst cavern and acoustic emission signals were monitored.The results show that there are major pulsation and accompanying pulsation in the process of coal and gas outburst.The major pulsation can occur five to six times in a single outburst process.After each major pulsation,there will be two or three times of accompanying pulsation.With the progress of outburst development,the pressure variation and average force of impact in each major pulsation shows a decreasing tendency,while the accumulative acoustic emission energy rises again after a decline,with the rising amount up to 60％.In the experiment,the pulverization of coal accompanies the gas outburst development continuingly,while the spalling of coal accompanies the outburst intermittently.
Keywords：coal and gas outburstpulsating phenomenonimpact forceacoustic emission
Publication Date：2018-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 145-154 )