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为研究近距离煤层群上部煤层开采时对下部煤岩层产生的应力分布影响效应,以潘二矿西四采区B组煤层地质及开采技术条件为背景,采用UDEC软件建立近距离煤层群下向卸压开采模型,获得了8-1煤层开采过程中下部煤层群围岩应力场分布特征及高应力的演化特征.研究结果表明:下向卸压开采下部煤层群的卸压效果与岩层结构、开采参数、煤层位置等密切相关,随着开采距离的增加,卸压范围成非线性递减,并受岩层岩性影响,卸压煤层支承压力峰值及卸压范围呈梯级演化.对于确定近距离煤层群下行卸压开采方案提供了合理依据并对回采巷道合理布置具有一定的指导意义.
In order to study the effect of upper coal seam mining on the stress distribution in lower coal seam near the coal seam group, taking the formation geological conditions and mining technology of Group B in the Xisi mining area of Panyi Mine as an example, the UDEC Pressure relief mining model to obtain the stress field distribution characteristics and the evolution characteristics of high stress in the surrounding rock of the lower coal seam group during the mining process of the 8-1 coal seam.The results show that the pressure relief effect of the lower coal seam group under the pressure relief mining is related to the rock structure, Mining parameters and coal seam position are closely related to each other. With the increase of mining distance, the range of pressure relief decreases nonlinearly and is affected by the rock lithology, and the peak value of supporting pressure and the pressure relief range of desorbed coal seam are evolving stepwise. The group descending pressure relief mining program provides a reasonable basis and reasonable arrangement of the mining gateway has a certain guiding significance.