摘要
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。
Ainfing to the problem of pressure relief verifieation of roadway roek burst of eoal body blasting prevention and eontrol, 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 Yuneheng Coal Mine has been conducted by using eleetromagnetism 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 nfiddle 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 eolffirmed based on inspection result.
作者
田昭军
王永
冯美华
Tian Zhaojun;Wang Yong;Feng Meihua(Shandong Longyun Coal Industry Co.,Ltd.,Heze 274000,China;Coal Mining and Designing Department,Tiandi Science and Technology Co.,Ltd.,Beijing 100013,China)
出处
《能源与环保》
2018年第9期54-58,共5页
CHINA ENERGY AND ENVIRONMENTAL PROTECTION
基金
国家重点研发计划项目(2017YFC0804202)
关键词
冲击地压
煤层爆破
效果检验
电磁波CT
冲击危险性
rock burst
coal blasting
effect test
electromagnetism wave CT
rock burst hazard
