回采工作面应力分布的电磁辐射规律

电磁辐射强度和脉冲综合反映了煤体前方应力的集中程度和危险程度，因此可利用电磁辐射技术对回采工作面的应力分布和变化趋势进行测定.测定结果表明，工作面煤柱应力在倾向上分布平稳，在走向上有明显的高低应力区出现，不同位置的应力随时间变化趋势基本一致.煤柱内部应力变化反映了煤柱深部松弛区和应力集中区的分布规律，煤体深孔预裂预爆措施会导致煤体卸压带的范围扩大，煤体的应力集中区向深部转移.

Electromagnetic radiation laws of the stress distribution in working face

The intensity and pulse number of electromagnetic radiation(EMR) reflect the centralized degree of stress in the frontage of coal body and dangerous degree of burst.Therefore the EMR method and technology were used to measure the stress distribution of coal stopes.Measure results show that the stress distribution of coal stope's front wall is steady on the strike,high and low stress area appears on the incline obviously.The stress-time trend of different positions in coal stope changes consistently.The stress changes in deep inner direction reflect the distribution laws of the stress-flabby zone and the stress-concentration zone stress in deep coal body.Using destress blast to eliminate the danger of rock burst can make the stress concentration remove the inner of coal pillar completely and increase the range of the stress concentration.