倾斜煤层采动影响下的挤压变形区移动变形特征分析

以重庆南桐矿区为工程背景,通过三维数值模拟方法,对倾斜煤层在三种不同开采宽度工况下上覆岩层移动挤压变形区特征进行了研究。结果表明:采宽由80 m增加到160 m时,煤层与岩层交接处应力变化较小,挤压变形区地表下沉速度较为缓慢;采宽由160 m增加到240 m时,煤层与岩层交接处应力变化非常显著,挤压变形区地表产生明显下沉;不同的开采工况下,挤压变形区沉陷位移都会出现一个峰值,且位于开采区下山方向,挤压变形区沉陷值受水平应力影响较小,走向和倾向方向的沉陷值以该峰值曲线呈中心对称。

Analysis on the Moving Deformation Characteristics of Extrusion Deformation Zone under the Influence of Mining in Inclined Coal Seam

The overlying strata movement and deformation characteristics of inclined coal seam under three working conditions of different mining width were studied by using three-dimensional numerical simulation method.The results show that when the mining width increases from 80 m to 160 m, the stress at the interface between coal seam and rock layer changes little, and the surface subsidence rate in the extrusion deformation zone is slow.When the mining width increases from 160 m to 240 m, the stress changes at the interface between the coal seam and the rock layer are very significant, and the surface in the extrusion deformation zone causes obvious subsidence.Under different mining conditions, there is a peak value of subsidence displacement in the extrusion deformation area, which is located in the downhill direction of the mining area. The subsidence value in the extrusion deformation area is less affected by the horizontal stress, and the subsidence value in the strike and trend directions is symmetric with the peak value curve.