硬厚砂岩顶板垮落引燃采空区瓦斯机制初步研究

doi:10.13722/j.cnki.jrme.2017.1584

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摘要高瓦斯煤层上部赋存硬厚砂岩顶板时，因顶板垮落引燃采空区内瓦斯甚至导致瓦斯爆炸事故时有发生。以夏阔坦煤矿下10煤层1007工作面开采为工程背景，采用室内实验和理论分析的方法，研究岩石摩擦效应引燃瓦斯的点火源、断裂岩层滑落失稳发生条件、边界支承条件和破断阶段对断裂岩层发生滑落失稳的影响。该工程地质条件下研究结论表明，坚硬砂岩摩擦过程产生的热量能够引燃瓦斯，与摩擦过程产生的火花束和高温岩粉流相比，高温热摩擦面更易引燃瓦斯，是主要点火源。顶板岩层初次破断后，岩层侧向破断尺寸与岩层厚度比值di/h常大于2.6；顶板周期性破断时，岩层侧向破断尺寸与岩层厚度比值di/h常小于2，顶板岩层周期性破断期间更易发生滑落失稳。边界支承条件对岩层滑落失稳发生影响较大，岩层破断时简支边界较固支边界更易发生滑落失稳，厚度大于11 m的岩层初次破断时、厚度大于4 m的岩层周期破断时，在简支边界处即可满足滑落失稳发生条件。当工作面上部为已采空区域，采场上部破断三角岩块是硬砂岩顶板垮落引燃采空区瓦斯的危险区域，可从顶板弱化和瓦斯治理两个方面开展防治工作。

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	秦广鹏1
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	王超2
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	张中腾2
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	裴云鑫2
	3

关键词 ：采矿工程, 硬厚砂岩, 滑落失稳, 摩擦, 瓦斯燃烧

Abstract：In case of thick and hard sandstone strata overlay on the high-gassy coal seam，sometimes gas in the goaf area will be ignited，even be exploded，due to the collapse of the roof. Taking the 1007 working face of the No.10 coal seam mining of Xiakuotan Coal Mine as an engineering background，based on the laboratory tests and theoretical analysis，the source of gas ignition by rock friction effects，the occurrence condition of slide and the influence of boundary support conditions and breaking stage on the failure of fracture rock formation were studied. The research results under the engineering geological conditions indicate that，the heat energy generated by the hard sandstone friction can ignite the gas. High-temperature friction surface is more likely to ignite the gas than the spark bundles and high temperature rock dust due to friction，and it is the main ignition source. During the first collapse process of the roof strata，the ratio of broken size to rock thickness(di/h) is usually larger than 2.6，and in the process of periodic collapse，the ratio of di/h is usually less than 2. The periodic failure of the top plate is more prone to slip-off than the initial breakage. The boundary support condition has a great influence on the instability of the rock strata. When the rock strata are broken，the boundary of simply support is more prone to slide and destabilization than that of the fixed support boundary. When the rock strata with a thickness greater than 11 m during the first collapse，or with a thickness of more than 4 m during the periodic collapse，at the boundary of simply support，it is able to meet the occurrence condition of the slide collapse. If the upper section adjacent to the working face has been mined out，the upper part of the stope is a danger zone for the gas ignition due to hard sandstone strata collapse. The preventive measures should be done about roof weakening and gas treatment.

Key words： mining engineering thick and hard sandstone strata slide collapse friction gas combustion

引用本文:

秦广鹏1，2，王超2，3，张中腾2，3，裴云鑫2，3. 硬厚砂岩顶板垮落引燃采空区瓦斯机制初步研究[J]. 岩石力学与工程学报, 2019, 38(S1): 2925-2933.
QIN Guangpeng1，2，WANG Chao2，3，ZHANG Zhongteng2，3，PEI Yunxin2，3. Primary study of goaf gas ignition mechanism by collapse of hard and thick sandstone roof stratum. , 2019, 38(S1): 2925-2933.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2017.1584 或 http://rockmech.whrsm.ac.cn/CN/Y2019/V38/IS1/2925

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