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通过对大兴矿七煤层北-701工作面运输、回风巷突出预测指标的跟踪测定值以及巷道瓦斯涌出量变化的统计分析，确定出了大兴矿四煤层开采保护范围的卸压角。
Based on the statistical analysis of the measured value of the prediction index of North-701 working face and the air return lane of Daxing No.7 coal seam, and the change of gas emission in the roadway, the relief angle of the mining range of the fourth coal seam in Daxing Mine was determined.