放顶煤工作面顶煤破碎机理研究现状与展望
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摘要
针对放顶煤工作面顶煤破碎问题,分析了煤层埋深、煤层厚度、煤体中的节理和裂隙等煤层赋存状况,支承压力、顶板活动、支架支承应力以及开挖卸荷等外界压力作用对顶煤的破碎影响。在分析顶煤破碎机理研究现状的基础上,提出了应加强顶煤节理裂隙原位精准探测技术,实现顶煤可视化;应深入研究支架对顶煤的破碎机理;提出了从能量角度考虑顶煤充分破碎必要条件的思路,为提高顶煤破碎程度及煤炭采出率奠定理论基础。
For the problem of the broken of top coal in the face of longwall top coal caving(LTCC), this paper analyzes the influence of depth of coal seam, thickness of coal seam, joint and fracture in coal mass, stress of abutment pressure, roof movement, bearing stress of bracket and excavation unloading effect on the broken of top coal. Based on the analysis of the research status of the mechanism of top coal broken, it is proposed that the study of the top coal broken mechanism should focus on improving the joint detection technology of top coal seam, which is to realize the in situ precise joint detection of top coal and then achieve visualization of top coal. At the same time, it is necessary to have a further study on the broken effect of bracket on top coal and propose the idea of necessary conditions for the fully broken of top coal from the energy point of view, which provides the theoretical foundation for improving the top coal fragmentation degree and the coal recovery rate.
For the problem of the broken of top coal in the face of longwall top coal caving(LTCC), this paper analyzes the influence of depth of coal seam, thickness of coal seam, joint and fracture in coal mass, stress of abutment pressure, roof movement, bearing stress of bracket and excavation unloading effect on the broken of top coal. Based on the analysis of the research status of the mechanism of top coal broken, it is proposed that the study of the top coal broken mechanism should focus on improving the joint detection technology of top coal seam, which is to realize the in situ precise joint detection of top coal and then achieve visualization of top coal. At the same time, it is necessary to have a further study on the broken effect of bracket on top coal and propose the idea of necessary conditions for the fully broken of top coal from the energy point of view, which provides the theoretical foundation for improving the top coal fragmentation degree and the coal recovery rate.
引文
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[3]钱鸣高,石平五,许家林.矿山压力与岩层控制[M].徐州:中国矿业大学出版社,2012.
[4]赵俊楼,蔡振宇,刘新河,等.放顶煤工作面顶煤破碎机理研究[J].河北煤炭,2004(3):6-8.
[5]李慧.浅埋藏坚硬特厚煤层放顶煤开采顶煤冒放性研究[D].太原:太原理工大学,2007.
[6]张耀荣,韩武学,林晋彬,等.综放工作面裂隙分布对其顶煤冒放性影响的研究[J].煤,2000(1):29-32.
[7]杨永辰,王庆康.三硬煤层顶煤破碎机理的探讨[J].矿山压力与顶板管理,1998(4):63-65.
[8]王家臣.厚煤层开采理论与技术[M].北京:冶金工业出版社,2009.
[9]王家臣,刘峰,王蕾.煤炭科学开采与开采科学[J].煤炭学报,2016(11):2651-2660.
[10]缪协兴,钱鸣高.综放采场围岩─支架整体力学模型及分析[J].煤,1998(6):1-5.
[11]田立军.坚硬煤层放顶煤综采顶煤破坏机理研究[C]∥赵炜.运筹学的理论与应用——中国运筹学会第五届大会论文集.西安:西安电子科技大学出版社,1996:468.
[12]张宪德,田家友,康岱昌.放顶煤工作面顶煤破碎机理及放煤高度的确定[J].煤炭技术,2006(8):61.
[13]王家臣,富强.低位综放开采顶煤放出的散体介质流理论与应用[J].煤炭学报,2002,27(4):337-341.