| 老顶的初次断裂步距和周期断裂步距 |
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| 引用本文： | 付国彬. 老顶的初次断裂步距和周期断裂步距[J]. 湖南科技大学学报(自然科学版), 1993, 0(1) |
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| 作者姓名： | 付国彬 |
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| 作者单位： | 中国矿业大学采矿系 徐州 |
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| 摘 要： | 本文应用板的极限分析法求老顶的断裂步距,从而解决了按板模型周现有的方法不能计算老顶周期断裂步距的问题这种方法的另一个显著的优点是它不但适用于矩形采空区而且也适用于非矩形采空区。作者导出了几种常见开采边界老顶的初次、周期断裂步距的表达式,并通过算例说明了公式的用法。本文最后讨论了工作面长度和开采边界对老顶断裂步距的影响,提出了对坚硬顶板控制有实际意义的工作面临界长度的概念。图5,表1,参6.
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| 关 键 词： | 老顶 板极限分析 初次断裂步距 周期断裂步距 工作面临界长度 |
FIRST AND PERIODIC FRACTURE LENGTH OF MAIN ROOF |
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| Fu Guobin. FIRST AND PERIODIC FRACTURE LENGTH OF MAIN ROOF[J]. Journal of Hunan University of Science & Technology(Natural Science Editon), 1993, 0(1) |
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| Authors: | Fu Guobin |
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| Abstract: | On this paper the method of plate limit analysis is applied to the determination of two breakage lengths of main roof. Therefore, the problem that the periodic breakage length of main roof as a plate can't be calculated in the present methods concerned has been solved. Anothor obvious advantage of this method is that it is suitable for not only rectanglar goafs but un-rectanglar wastes. The author deduces expressions for the first and periodic fracture length of main roofs with common boundary conditions of working faces and takes an example to illustrate their usage. Finally, the paper discusses the influence of different face lengths and boundary conditions on the lengths of main roof breaking and puts forward the concept of critical face length that has practical significience to the control of hard main roof. 5figs. 1tab, 6refs. |
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| Keywords: | main roof plate limit analysis frost breakage length periodic fracture length critical wall length |
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