Study On The Role Of Relief And Release Under Upward Protective Seam Mining Of Huangsha Mine

It will have an enormously significant to investigate on up-protective layer mining for pressure relief of high gas or outburst tendency coal seam. According to actual conditions of HuangSha mine of FengFeng group, this paper based on laboratory tests and started with rock mechanics properties of coal, then evolution laws of mechanical properties when gas-filled coal samples unloading and different mechanical properties of coal samples when it filled gas and none gas were obtained by studied characters of gas moving in two aspects of coal samples, one aspect was coal specimens in complete stress-strain process and the other one was the samples in conditions during unloading of confining and axial pressure. And all data were acquired by gas-filled coal mechanical testing system which was in-house development design and combined with MTS815 rock mechanics test system. The up-protective layer mining for pressure relief of roof and floor was studied by the approach of FLAC3D and systematic study for the pressure release of protected seam was performed, patterns and characteristics of pressure relief of protected seam that influenced by up-protective layer mining were revealed. Based on these, two different conditions of uniform and non-uniform of gas moving features in the case of pressure release in coal-rock were researched by the numerical software of CFD-fluent 6.23.