寺河矿大断面巷道围岩变形特征的相似材料模拟试验研究

Similar Material Simulation on Deformation Features of Surrounding Rock in Large-sectional Roadway in Sihe Mine

通过相似材料模型试验,分析了寺河矿3号煤层大断面回采巷道在不同地应力环境下围岩的变形规律。试验结果表明:埋深600m和800m时的巷表面收敛率分别是400m时的2.2倍和3.0倍。随距巷中心线距离增大,顶板水平和垂直位移分别增大和减小;随距帮距离增大,帮水平和垂直位移分别先减小后增大和减小;随顶板层位增高,顶板水平位移大幅减小,顶板垂直位移小幅增大;随帮层位增高,帮水平和垂直位移都增大,并且上述位移分布曲线的变化率均随埋深的增加而增大。

Similar material simulation was used to study the deformation law of surrounding rock in the large-sectional roadways on No.3coal seam under different geostress.The results show that,when buried depth is 660 meters and 800 meters,the surface convergence rate is 2.2and 3.0times as many as that at 400 meters deep,respectively.With the increase of the distance from the center line,roof horizontal displacement increases,but roof vertical displacement decreases.With the increase of the distance from the two walls,wall horizontal displacement goes down first,and then goes up and its vertical displacement decreases.With the increase of roof height,roof horizontal displacement decreases sharply and vertical displacement increases slightly.With the increase of the height of wall layer,both horizontal and vertical displacement increase.In addition,the all displacements mentioned above increase with the buried depth.