保护层开采卸压增透效应研究及其定量表征方法探索（研究生论坛稿件）

保护层开采是高突矿井瓦斯治理地主要方式及开采方法，保护层开采的卸压增透效果当前无法量化表征的，缺乏评价体系。以平板流体模型增透率理论为基础，结合平煤十矿地质条件，通过离散单元法建立保护层开采数值模型，获得保护层开采不同距离时采空区下方的增透率图谱及被保护层的应力分布。研究结果表明：保护层开采过程中，采面前方15 m处支撑压力会出现应力峰值，随着采面的推进，增透率与现场瓦斯流量呈现正相关关系；在采空区下方，被保护层卸压以及增透效应明显，且卸压区范围与增透率分布集中区域基本一致，均随着采空区范围的扩大而增大。该研究成果证实了增透率理论可以作为保护层开采卸压增透指标，对现场保护层回采设计、瓦斯抽采设计范围的确定提供了更加科学的依据。

Study on the Effect of Pressure Relief and Permeability Enhancement in Protected Coal Seam Mining and Its Quantitative Characterization Method

Protected coal seam mining is the main mining method for the regional gas control, however, its pressure relief effect can not be quantized currently as the lack of evaluation system. Based on the mining-enhanced permeability theory, a numerical model was established by the discrete element method on the geological conditions of No. 10 mine of Pingdingshan coal mining group, then the contour maps of mining-enhanced permeability were obtained. The result indicated that: when the protective layer was mined, the peak value of pressure occured 15 m ahead of working face; the mining-enhanced permeability and the gas flow presented a positive correlation. At the bottom of the goaf, the distressed zone had roughly the same distribution with the mining-enhanced permeability. The results confirmed that the mining-enhanced permeability theory can be used to evaluate the effect of pressure relief, which can provide a more scientific foundation for the design of protected coal seam mining and gas drainage scope.