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在对比分析煤岩体峰前和峰后阶段渗透率演化规律差异的基础上,通过考虑开挖损伤对煤岩体渗透率的影响,基于裂隙平板模型建立了考虑损伤效应的峰后煤岩体渗透率模型;将实验测试数据与渗透率模型计算结果进行对比分析,验证了渗透率模型的合理性.基于此模型,具体分析了3种典型开采方式下(保护层开采,放顶煤开采和无煤柱开采)工作面前方煤岩体渗透率分布特征.研究结果表明:峰前和峰后阶段煤岩体渗透率均随应力呈现指数增长趋势,但两者在增长量上存在明显不同;根据渗透率分布特征,可以将工作面前方煤岩体划分为4个区域:渗流开放区,渗流屏蔽区,渗流过渡区和原岩渗流区;3种开采方式对工作面前方煤岩体的瓦斯渗流影响规律相似,但是在影响区域范围上存在较大差异.
Based on the analysis of the difference of permeability evolution between pre-peak and post-peak phases of coal and rock mass, the post-peak coal and rock mass considering the damage effect is established based on the fracture plate model considering the influence of excavation damage on the permeability of coal and rock mass. Permeability model, the experimental test data and permeability model calculation results were compared and analyzed to verify the rationality of permeability model.Based on this model, three kinds of typical mining methods (protective layer mining, caving mining and Non-coal pillar mining), the results show that the permeability of coal and rock mass shows an exponential increasing trend with the stress before and after the peak, but there is a clear difference between the two in the amount of growth; According to the characteristics of permeability distribution, the coal bodies in front of the working face can be divided into four areas: open seepage zone, seepage shield zone, seepage transition zone and original rock seepage zone. Three kinds of mining methods can reduce the gas The influence laws of seepage are similar, but there are big differences in the influence area.