基于UDEC数值模拟实验的保护层无煤柱全面卸压开采分析
Study on Overall Pressure Relief Mining Without Pillar in Protective Layer Through UDEC Numerical Simulation Experiment
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摘要: 针对低透高突煤层群中不具备常规煤层（煤厚≥0.8 m）保护层开采条件及消除保护层遗漏煤柱下方被保护层中卸压盲区的问题，提出了极薄、薄煤层半煤岩保护层无煤柱全面卸压开采技术。基于沙曲煤矿地质条件，采用UDEC数值模拟实验分析得出：被保护煤层卸压盲区宽度随着保护层煤柱宽度的增加大致符合拟合直线方程y=17.09x-10.05的线性增长规律，拟合度R2=0.896 8；当无煤柱开采时，在原留设煤柱位置的下方被保护层中不发生垂直应力集中，即消除了卸压盲区。Abstract: In view of the problem that the low permeability and high outburst coal seam group does not have the mining condition for the protection layer of conventional coal seam (coal thickness ≥0.8 m) and the ability to eliminate the blind area of pressure relief in the protected layer under the residual coal pillar, the overall pressure relief mining technology without coal pillar in the semi-coal rock protective layer of the extremely thin coal seam was proposed. Based on the geological conditions of Shaqu Coal Mine, it’s concluded by the use of UDEC numerical simulation analysis that with the increase of the width of the coal pillar of the protective layer, the width of the unloading blind zone of the protected coal seam roughly conforms to the linear growth law of the fitted linear equation y=17.09x-10.05, and the fitting degree R2=0.896 8. When there is no pillar mining, vertical stress concentration does not occur in the protected layer below the original pillar position, that is, the blind area of unloading pressure is eliminated.
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