松散煤层综放工作面支架与围岩失稳机理
Instability Mechanism of Hydraulic Support and Surrounding Rock for Fully Mechanized Caving Face in Soft Coal Seam
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摘要: 为了探寻松散煤层综放工作面放顶煤支架失衡、端面顶煤冒落及煤壁片帮的原因并对支架的适应性做出评估,结合现场实测分析了采场围岩状态及支架工作状况,计算解析了支架的受力情况与承载特征。认为支架失稳的原因为:工作面割煤高度偏高造成松散煤层大量片帮,导致端面距过大,使支架不能及时护顶,进而引发破碎顶煤严重冒落,同时顶梁上方冒落形成的空洞促使支架实际支撑力偏小,为支架歪斜提供了条件。试验点选用支架的额定支撑力可满足需求,但在该条件下前梁千斤顶额定推力1 060 kN,未能达到设计要求的1 139 kN,不能满足空顶要求。针对上述问题提出了合理的建议及改善措施。Abstract: In order to seek the causes of imbalance of sublevel caving hydraulic support, top coal caving at the end face and coal rib spalling, and to evaluate the adaptability of hydraulic support, we investigated the situation of surrounding rock in stope and working status of hydraulic support with the method of field measurement. After that, the force condition of support was calculated and the bearing characters were analyzed by mechanical calculation. The results show that the reasons for the instability of hydraulic support are as follows. The face-to-canopy distance caused by the large cutting height is so big that the hydraulic support cannot support the roof in time, so top coal broke and caved seriously, and then cavities generated on the top beam, which resulted in low holding power and skew hydraulic support. The rated resistance of supports used in the test point is sufficient, but the rated thrust force of hoisting jack in front beam is only 1 060 kN and deficient to meet the required value of 1 139 kN. Therefore, the hydraulic support cannot adapt the production condition of the working face completely. Finally, reasonable suggestions and measures were proposed to these issues.
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[1] 王国法,刘俊峰,任怀伟.大采高放顶煤液压支架围岩耦合三维动态优化设计[J].煤炭学报,2011,36(1):145-151. [2] 殷帅峰,何富连.综放支架超声相控阵无损探伤原理与检测技术[J].采矿与安全工程学报,2012,29(3):328-333. [3] 陈胜利.大倾角倾斜长壁综放工作面仰斜开采工艺[J].煤矿安全,2012,43(8):79-81. [4] 王家臣.我国综放开采技术及其深层次发展问题的探讨[J].煤炭科学技术,2005,33(1):14-17. [5] 何富连,杨伯达,杨洪增,等.综放面支架泄漏故障的超声微震识别原理及探测实践[J].煤矿安全,2012,43(6):129-136. [6] 吴健,张勇.综放采场支架-围岩关系的新概念[J].煤炭学报,2001,26(4):350-355. [7] 孔令海,姜福兴,刘杰,等.基于高精度微震监测的特厚煤层综放面支架围岩关系[J].岩土工程学报,2010,32(3):401-407. [8] 刘长友,杨培举,丁斌.两柱掩护式综放支架与围岩相互作用相似模拟研究[J].中国矿业大学学报,2011,40(2):167-172. [9] 刘俊峰,乔木,王国法,等.皖北矿区中厚煤层综采液压支架适应性研究[J].煤矿开采,2006,11(2):19. [10] 黄庆国,孔令海.综放工作面支架围岩关系相似材料模拟试验[J].煤炭科学技术,2010,38(4):28-31. [11] 杨培举,刘长友.综放面端头基本顶结构与合理支护参数[J].采矿与安全工程学报,2012,29(1):26-32. [12] 张幼振,石平五,董新发.急斜煤层综放开采中液压支架适应性分析[J].煤矿机械,2006,27(1):51-53.
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