Tiandi Science and Technology Company Limited

通过分析我国10 m以下和10 m以上煤层综放开采矿压显现的主要特征,可知10 m以上煤层综放开采矿压显现强烈并有周期性;顶煤体对于综放开采矿压显现起着重要作用,在顶板变形压力作用下顶煤体可转变为"似刚性顶煤体";顶板可形成"组合悬臂梁—铰接岩梁"的结构,该结构的周期性运动使工作面产生"小、大"周期来压现象,并阐述了其发生机理;通过理论分析得到了支架工作阻力下限值解析计算式,分析可知支架工作阻力主要影响因素为直接顶岩块长度与厚度、基本顶断裂步距与厚度、矸石刚度、岩层破断角和冒落矸石碎胀系数。

With the analysis on the major features of the mine pressure behaviors occurred in the fully-mechanized top coal caving mining face in the seam witha t hickness below 10 m or over 10 m, the mine pressure behavior occurred in the fully mechanized top coal caving mining in the seam with a thickness over 10 m would b e serious and periodical.The top coal would have play an important role in the mine pressure behavior of the fully mechanized top coal caving mining and under the roof deformation pressure role, the top coal would be converted to seemed rigid top coal.The top coal would form a structure of combined suspended boom beam-articulated rock beam, the periodical movement of the structure would cause small and large periodical roof weighting phenomenon occurred in the coal mining face and the occurr ence mechanism was stated.With the theoretical analysis, the analytic formula for the working resistance low limit value of the powered support was obtained. The major influence factors of the working resistance of the powered support analyzed would be the rock block length and thickness of the direct roof, failure step distance and thi ckness of the basic roof, rigidity of coal rejects, broken angle of the rock strata and broken swelling coefficient.

“十二五”国家科技支撑计划资助项目(2012BAB13B02-02)；开采设计事业部青年创新基金资助项目(KC-QNCX-2012-02)；