极近距离煤层下分层开采矿压显现规律
蒋升;孔杰;钟宜涛;王敏
【期刊名称】《煤矿安全》
【年(卷),期】2012(043)012
【摘要】Overlying strata movement laws of lower slicing in Luxi Coal Mine is studied by workface support force,deformation of the surrounding rock,borehole stress,anchor working resistance and hydraulic prop stress in crossheading.The results show that initial caving interval of the immediate roof in lower slicing is 15.6 m and the upper is 26.1 m.Initial caving interval of the main roof is 31.8 m and periodic weighting length is between 10~13 m.The average resistance of hydraulic-support-ZY4800/18/38 in workface is 27.2 MPa,which is 86.4% of the rated.The hydraulic-supports have better adaptability.Through the analysis of abutment pressure distribution characteristic in rail crossheading and belt crossheading,influence scope of advanced support pressure is 24.6 m in rail crossheading,and it is 31.135 m in belt crossheading.%通过综采工作面支架受力、巷道围岩变形、钻孔应力、锚杆工作阻力及顺槽单体液压支柱受力5方面综合观测,对鲁西煤矿3下煤层覆岩运动规律进行了研究。研究结果表明：直接顶下分层初次垮落步距平均15.6 m,直接顶上分层初次跨落步距26.1 m,老顶初次来压步距31.8 m和老顶周期来压步距在10～13 m之间;ZY4800/18/38型掩护式液压支架工作阻力的平均值是27.2 MPa是支架额定工作阻力的86.4%,对工作面顶底板支护的适应性较好;通