近距离残煤合采工作面支架工作阻力研究

Study on Working Resistance of Powered Support Applied in Combined Mining Face in Close Distance Residual Seam

为了掌握近距离残煤合采工作面的支架工作阻力,方便工作面支架选型,研究划分了覆岩的垮落带与裂隙带,确定了工作面液压支架的动载与静载来源,分别对8#煤层上分层采空区下方、8#煤层实体煤下方、8#煤层残留刀柱下方的工作面支架工作阻力进行计算,结果表明,原选用的ZF7000/20/39型放顶煤液压支架额定工作阻力无法满足要求,更换为ZF8200/20/40型放顶煤液压支架,该液压支架应用期间,支架安全阀共开启4次,应用效果良好。

In order to understand a working resistance of a powered support applied to a combined coal mining face in a close distance residual seam and to make a easy selection of the powered support for the coal mining face, a collapsing zone and cracking zone of the strata was studied and divided, a dynamic load and static load sources of the powered support in the coal mining face and a calculation was conducted on the working resistance of the powered support in the coal mining face individually under a goaf of a top slice of a top seam, a solid coal seam of the top seam and residual knife pillar of the top seam. The results showed that a rated working resistance of a previous selected ZF7000/20/39 coal caving hydraulic powered support could not meet the requirements was replaced by a ZF8200/20/40 coal caving hydraulic powered support. During the application period of the hydraulic powered support, a safety valve of the powered support was opened 4 times and the application effect of the powered support was excellent.