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为研究复杂应力状态下条带煤柱的长期稳定性及其变化规律,采用理论分析和数值模拟的方法,推导了井下留设煤柱的蠕变模型,分析了该模型具有应变随时间变化逐渐增大而后又趋于稳定的非线性特征,同时试验得出的蠕变曲线也验证了模型的衰减蠕变过程.FLAC3D模拟研究结果表明,七台河90#条带煤柱的蠕变类型为衰减蠕变,煤柱在开采结束的第三年进入稳定蠕变阶段,这与现场地表破坏程度的考察及矿方对地表下沉的监测结果相符合.研究对胜利煤矿一采区的上覆岩层和地表建筑物起到了很好的保护作用.
In order to study the long-term stability and the variation regularity of strip coal pillar in complex stress state, the creep model of coal pillar left underground was deduced by theoretical analysis and numerical simulation. The variation of strain with time was analyzed Then increases and then tends to stable non-linear characteristics, and the experimental creep curve also verifies the decay creep process of the model.FLAC3D simulation results show that the Qiantai 90 # strip coal pillar creep type is Decay creep, the coal pillar enters the stable creep stage in the third year after the end of mining, which is consistent with the investigation of the degree of on-site surface damage and the monitoring result of the subsidence of the mine surface.Research on the overlying of a coal mining area Rock formations and surface structures play a very good protective role.