近距离保护层开采遗留煤柱应力集中区瓦斯赋存规律研究
Study on Gas Occurrence Law in Stress Concentration Zone of Remaining Coal Pillars in Close Protection
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摘要: 针对阳煤集团新景矿9号煤层9106工作面过8号煤层遗留煤柱的矿压显现规律,采用了理论分析、数值模拟及现场实测相结合的方法,首先建立了保护层力学模型,获得了保护层力学计算公式;其次通过FLAC3D数值模拟揭示了煤柱压煤区应力分布规律及影响范围;最后进行现场监测验证。结果表明:保护层开采完成时垂直应力状态以遗留煤柱为中心,依次对称向两边扩散,距离遗留煤柱越远,其扩散范围就越广,遗留煤柱影响范围33 m,最大应力38.6 MPa;通过现场实测煤层应力集中区及卸压区瓦斯钻屑指标,得到钻屑瓦斯解吸指标K1值、钻屑量S值与应力分布状态具有良好的相关性,同时得出在近距离保护层开采情况下煤层瓦斯可以得到充分释放。Abstract: According to the law of mine pressure appearance of No.9 coal seam 9106 working face passing through No.8 coal seam in Xinjing Mine of Yangmei Group, the combination of theoretical analysis, numerical simulation and field measurement is adopted, firstly, the mechanical model of protective layer is established, the mechanical calculation formula of protective layer is obtained; secondly, through FLAC3D numerical simulation, the stress distribution rule and influence range of coal pillar pressure area are revealed; finally, the field monitoring verification is carried out. The results show that: the vertical stress state at the completion of protective layer mining is centered on the residual coal pillar, spreads to both sides in sequence; the further away from the remaining pillar, the wider its spread; the influence range of the remaining coal pillar is 33 m, the maximum stress value is 38.6 MPa; through actual measurement of the gas drilling cutting index in stress concentration zone and the pressure relief zone, the result shows that cuttings desorption index K1 value, amount of cuttings S value and stress distribution state have good correlation, at the same time, it is concluded that the coal seam gas can be fully released under the condition of close protection seam mining.
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