School of Mechanics and Civil Engineering,China University of Mining and Technology (Beijing) School of Energy Science and Engineering,Henan Polytechnic University

针对不连沟煤矿F6202大采高综放工作面煤壁片帮严重的问题,通过现场调研观测,根据煤壁片帮位置,总结并分析了回采过程中煤壁片帮的基本特征。进一步分析了顶板结构、液压支架工作阻力及工作面推进速度对煤壁片帮程度的影响。研究表明:顶板形成的"下位组合悬臂梁-上位砌体梁"结构中组合悬臂梁失稳断裂引起煤壁上方"反弹区"向煤壁冲击,以及支架工作阻力偏小、工作面推进速度过快引发组合悬臂梁结构强度伪增强而积聚更多应变能瞬间释放是导致大采高综放条件下煤壁片帮的重要因素,增大液压支架工作阻力能够降低煤壁片帮程度。提出了"煤层注水、适当减缓工作面推进速度、提高液压支架工作阻力"的片帮综合治理方案;工程实践表明,治理后煤壁片帮频次和日片帮深度均值较之前大幅减小,取得良好片帮治理效果。

According to the serious sloughing problem of the coal wall nNo.F622 high cutt g full - mechanized top cal caving mining face inBuliangou Mine, with th site investigation and obsevation.based on the spallig locaton of the cal al. he paper had a summarization and analysis on the spalling bas c features of thecoal wall in the mining process The paper had a further analysis on the roof structure,powered support workng res itance and coal mining face pushing forward speedaffected to the salig degreeof the cal wall The stuty showed that a coal wall impact by the rebcunding zone at the upperof the coal val .cured by the insabilitand breaking of the combined suspended beam in the botom combined suspended beam upper lined beam structure formed by the roof.as well as thestrength pseudoincreased of the combined suspended beam structure strength and the instantaneous releasing of the accurulated more strain energy caused by the low resistance ofthe powered support and oofast pushing forward speed of the coal mining face would be the inporant factors to cause the sloughing f the coalwal nder the conditonof the igh cuting full - mechanized top coal caving mining. The working resistance of the powered suppor increased would reduce the sloughing degree ofthe coawell A comprehensive sloughing control plan of the " seam water injction proper reduced pushing foward speed of the cal mining fae and the working resistance ofthe powered suppor increased" as provided. The engineering practices showed tht anter conrol plan conduced,the sloughing frequency of the cal wall and dail soughing depth were both highly reduced than previous and good sloughing control effect was obtained.

国家重点基础研究发展计划(973计划)资助项目(2013CB227903)；国家自然科学基金资助项目(51374093,51104058)；