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开采保护层是防治煤与瓦斯突出最有效的措施之一,其关键是保护范围的合理确定。针对急倾斜多煤层上保护层开采有效保护范围的划定问题,基于煤层瓦斯越流理论,根据煤岩层变形与瓦斯渗流的固-气耦合作用,建立了瓦斯渗流场方程和煤岩体变形场方程,得到了急倾斜上保护层开采瓦斯越流固-气耦合数学模型。以南桐矿区某矿上保护层开采为实例,通过多物理场耦合系统,建立了该矿上保护层开采瓦斯越流几何模型并进行数值计算,获得了上保护层工作面开采后被保护层瓦斯压力的分布规律,确定了上保护层开采的卸压保护范围。数值计算与现场考察试验结果具有一致性,由此验证了数值计算的合理性。研究结果可以对现场保护范围的划定及卸压瓦斯抽放等提供理论指导,具有实际工程意义。
The exploitation of the protective layer is one of the most effective measures to prevent coal and gas outburst. The key point is the reasonable determination of the scope of protection. Based on the theory of gas flow over coal seam, according to the solid-gas coupling between deformation of coal bed and gas seepage, the seepage field equation and the deformation field of coal and rock mass are established. Equation, a mathematical model of fluid-solid-atmosphere coupling gas extraction in steep upper protective layer is obtained. Taking the exploitation of protective layer in a mine in Nantong mining area as an example, the multi-physics coupling system was used to establish gas cross-flow geometric model for the mining of upper protective layer, and numerical calculation was carried out. After the mining of upper protective layer working face, Gas pressure distribution, to determine the upper protective layer pressure relief protection of the mining area. The numerical calculation is in good agreement with the field test results, which verifies the rationality of numerical calculation. The research results can provide theoretical guidance on the delineation of on-site protection scope and relief gas drainage and so on, which has practical engineering significance.