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为了得到复杂地质条件下的采煤沉陷特征,提高采煤沉陷预计精度,采用FLAC3D软件模拟开挖挤压构造应力分别为自重应力的0.1,0.5,1.0,1.5,2.0倍和拉张构造应力分别为自重应力的0.005,0.01,0.05,0.1,0.5倍,节理倾角为0°,30°,60°和90°相耦合的55个模型,考察构造应力与节理耦合对采煤沉陷的影响.模拟结果表明:其他地质和采矿条件均相同的条件下,随着挤压应力的增大,地表最大下沉值减少,地表下沉盆地范围增大;拉张构造应力时的采煤沉陷特征与之相反.当构造应力不变时,随着节理倾角增大地表最大下沉值增大,下沉盆地范围减小.因此,节理倾角及拉张构造应力与采煤沉陷正相关,挤压构造应力与之负相关.
In order to obtain the characteristics of coal mining subsidence under complex geological conditions and improve the prediction accuracy of coal mining subsidence, the structural stress of excavation and extrusion by using FLAC3D software are respectively 0.1, 0.5, 1.0, 1.5, 2.0 times and tensile structural stress The effects of tectonic stress and joint coupling on coal mining subsidence were investigated for 55 models with coupling stress of 0.005,0.01,0.05,0.1,0.5 times and joint inclination of 0 °, 30 °, 60 ° and 90 °. The results show that under the same conditions of other geological and mining conditions, the maximum subsidence decreases with the increase of compressive stress and the range of surface subsidence basin increases. The characteristics of coal mining subsidence under tensile stress On the contrary, when the tectonic stress is constant, the range of the subsidence basin decreases with the increase of the maximum subsidence of the joint due to the increase of the dip angle of the jointing.Therefore, the jointed dip and tensile tectonic stress are positively correlated with the coal mining subsidence, Negatively related.