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富含甲烷厚煤层经综采放顶煤方法开采后 ,甲烷运移通道和聚集空间随采场上覆岩层活动特征及导气裂隙带空间分布形态而不同。本文分析了煤层采动后采场覆岩关键层活动特征对导气裂隙带分布形态的影响 ,提出上覆岩层中破断裂隙和离层裂隙贯通后在空间形成椭抛带分布 ,阐述了卸压甲烷在椭抛带的升浮—扩散运移理论 ,为实现煤层与甲烷的安全共采提供了科学依据。
After the methane-rich thick coal seam is mined by the fully mechanized top coal caving method, the migration channels and the accumulation space of methane vary with the characteristics of the overlying strata movement in the stope and the spatial distribution of the gas-conducting fractured zone. In this paper, the influence of the key strata movement characteristics of overburden strata on the distribution of gas-conducting fractured zone after mining is analyzed. The distribution of the elliptical zone in the overlying strata and the fissure in the overlying strata formed in the space are discussed. The theory of ascending and descending diffusion of methane in the elliptical zone provides a scientific basis for the safe co-mining of coal and methane.