冲击地压煤层爆破卸压效果分析

针对煤体爆破防治巷道冲击地压卸压效果检验的问题，分析了煤层爆破卸压防冲机理与电磁波在地下煤岩体衰减规律，建立了基于爆破产生裂隙区与电磁波衰减良好对应关系的电磁波CT评价冲击危险的方法及模型。采用电磁波CT法对郓城煤矿1301回风巷煤层爆破卸压前后的电磁波衰减特征进行了对比分析，研究表明，煤层爆破卸压显著降低了爆破区域的煤体强度，使得煤体中部的应力向煤体深处转移，从而降低了冲击危险性；同时，爆破对支护区围岩的损伤较小，卸压与支护耦合性较好。基于检验结果确定了合理的爆破参数。

Effect analysis of pressure relief using blasting of coal seam with rock burst danger

Aiming to the problem of pressure relief verification of roadway rock burst of coal body blasting prevention and control，the mechanism of coal seam blasting pressure relief and the attenuation law of electromagnetic wave in underground coal and rock mass were analyzed，the method and model of roadway rock burst risk evaluation with electromagnetic wave CT can be established based on good corresponding relationship between fracture generated by blasting and electromagnetic wave attenuation.The comparison and analysis of electromagnetic attenuation feature before and after blasting of coal seam with rock burst danger in 1301 return airway of Yuncheng Coal Mine has been conducted by using electromagnetism CT method.The research indicates that blasting of coal seam with rock burst danger remarkably reduced the coal strength in blasting area，making strain in the middle part of coal shifting to deep coal and reducing the risk of rock burst.Meanwhile，the blasting has little damage on the wall rock of supporting area and the pressure relief and supporting has good coupling.The reasonable blasting parameter has been confirmed based on inspection result.