坚硬顶板大采高工作面压架事故及支架阻力分析

Analyses of support crushing accidents and support working resistance in large mining height workface with hard roof

针对大同晋华宫煤矿坚硬顶板大采高综采工作面生产过程中发生压架事故的情况,深入分析压架事故的类型和原因,并基于大采高综采工作面覆岩结构特征,采用理论分析方法,分析得到了坚硬直接顶关键层的悬顶长度的计算方法及其影响因素;对大采高坚硬顶板综采工作面支架工作阻力的确定进行了载荷估算法的修正算法;并根据修正结果及地质条件,计算得到了402盘区工作面支架的合理工作阻力为12 184 kN,支护强度为1.22 MPa,同时确定了合理的支架架型;通过工业性试验,实测分析了所选支架的适应性,结果表明了理论分析计算结果和所选架型的合理性,保障了402盘区大采高综采工作面的安全高效开采。

According to the support crushing accident in the large mining height fully-mechanized face with hard roof condition in Jinhuagong Mine, the type and cause of the accident was given by thorough analyses. Based on the struc- ture of overlying strata, the calculating method for hanging length of the key strata in immediate roof and its influencing factors were put forward with theoretical analyses. The load-estimate-method was modified to obtain the reasonable sup- port working resistance in the large mining height fully-mechanized face with hard roof condition. In accordance with the method and the geological condition of 402 panel, the reasonable working resistance of support is 12 184 kN, the supporting strength is 1.22 MPa and the support type was determined. With these results, the large mining height fully- mechanized face in 402 panel achieved safety and high efficiency mining, which shows that the theoretical analyses and the selected support type are reasonable.