祁东煤矿6_130工作面压架原因分析及对策

Analysis and Countermeasures of Powered Support Jammed Cause in No.6_130 Coal Mining Face of Qidong Mine

祁东煤矿6130工作面半年间就发生了6起压架事故,为分析其发生压架事故的主要原因,对工作面压架地方地质条件进行分析,得出了6130工作面在四含水层较薄的第Ⅰ块段可以安全开采,而在四含水层厚度增大的第Ⅱ块段开采时却接连发生压架事故,研究结果表明:高水压松散含水层可以传递上覆表土层的载荷,因此当工作面在此条件下进行开采时,覆岩关键层易形成复合破断,使砌体梁结构的滑落失稳,从而导致工作面压架事故的发生。可见,四含水层的存在对工作面回采有很大影响,通过对压架危险区域进行预测,采用人工预先破碎下部关键层、控制工作面的推进速度、放水降压等措施避免压架事故的发生。

There were six accidents of the powered supports jammed occurred in No.6130 coal mining face of Qidong Mine within six months.In order to analyze the main causes of the powered support jammed accidents,the paper had an analysis on the site geological conditions of the powered support jammed in the coal mining face.The analysis showed that No.6130 coal mining face located at the first section of the No.4 Aquifer which the thickness was not high could be safe in mining operation and at the second section of the No.4 Aquifer which the thickness was increased,there were several powered support jammed accidents occurred during the mining period.The study results showed that the high pressurize water and loose aquifer could transfer the load of the top overburden.Therefore when the coal mining face is operating under such condition,the key stratum of the strata above the coal mining face would have complex breakings and the beam structure would backfall and lost stability.The powered support jammed accident would be occurred in the coal mining face.The water existed in the aquifer would have great influences to the mining operation of the coal mining face.With the prediction on the powered support jammed danger area,the pre-breaking the key layer of the lower part of the strata,the control of the coal mining face advancing rate,the water drainage to reduce water pressure and other measures,the powered support jammed accident could be avoided.