【摘要】 掘进煤巷工作面应力"三带"分布对延时突出起着关键作用.采用岩石破裂过程RFPA2D分析软件数字仿真了煤巷掘进工作面应力状态及“三带”分布范围,分析了渗透力对瓦斯突出的作用.结果表明:充分卸压带为2 m,部分卸压带为2~6 m,集中应力带为6~18 m.由于掘进工作面煤层应变软化,卸压带宽度随时间延长而展宽;当煤体水平承载能力小于水平载荷时,煤体脱离,在重力作用下冒落、掉渣.此时水平载荷转移到深部煤体,使处于临界状态的深部煤层破坏.这是一个正反馈的加速过程,最后水平载荷形成应力破坏波,造成煤体的快速拉裂破坏,形成煤与瓦斯突出.更多还原

【Abstract】 The "three area" distribution of stress in coal driving is a key factor for delaying the outburst.The stress distribution and range of "three area" were calculated with a RFPA~2D software,and the effect of permeable force on the gas outburst was analyzed.The full stress-relaxed area of 2 m,the partial stress-relaxed area of 2～6 m and stress concentration area of 6～12 m were achieved.The width of stress-relaxed area increases with time because of the strain-softening in coal driving.Coal in the wall falls by the action of gravity when the horizontal carrying capacity is less than the horizontal load,which leads the horizontal load transfers to the deep coal seam to make the stress of it destroyed.And this is a positive feedback acceleration process till the stress destroy wave is formed,and results in the quick failure of the coal seem and the coal and gas outburst.更多还原