CAJ | 학술논문

针对顾桥矿坚厚硬顶板会出现大面积悬顶的情况，且大面积悬露的顶板突然断裂后有压倒支架、产生强冲击瓦斯风暴的可能性，故在顾桥矿1123（1）工作面实施深孔预裂爆破弱化坚硬顶板技术的研究。通过试验表明：顾桥矿1123（1）工作面在实施深孔预裂爆破弱化坚硬顶板后，顶板的初次垮落步距从预测的45-50m减小到27.3m左右，支柱承受压力在可以接受范围内，未出现顶板强烈来压压倒支架的情况；回风巷中瓦斯浓度控制在0.6％以下，抽采瓦斯量稳定在70 m3/min，未出现瓦斯超限和煤与瓦斯突出的情况。
침대고교광견후경정판회출현대면적현정적정황，차대면적현로적정판돌연단렬후유압도지가、산생강충격와사풍폭적가능성，고재고교광1123（1）공작면실시심공예렬폭파약화견경정판기술적연구。통과시험표명：고교광1123（1）공작면재실시심공예렬폭파약화견경정판후，정판적초차과락보거종예측적45-50m감소도27.3m좌우，지주승수압력재가이접수범위내，미출현정판강렬래압압도지가적정황；회풍항중와사농도공제재0.6％이하，추채와사량은정재70 m3/min，미출현와사초한화매여와사돌출적정황。
For the hard and thick roof or Guqiao mine may happen large overhang , and the suspension of roof has the possibility of gas storm and a strong impact after the fracture , so in the 1123 (1) working face of Guqiao coal mine, the deep hole pre-splitting blasting weakening hard roof technology was studied .The experiment result showed that after weakening the hard roof in 1123 (1) working face of guqiao coal mine by the deep hole pre-split-ting blasting , the first caving step distance of the roof decreased from the prediction value of 45-50 m to 27.3 m or so, the bealing pressure of the pillars were in the acceptable range , and the situation of overwhelming support by strong pressure of roof did not appeared .The gas concentration in the air return way was controlled under 0.6%, and the gas drainage quantity was stable in 70m3/min, and the gas overrun and coal and gas outburst did not occurred .