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基于随机介质移动理论,构建了采动影响型地下煤火诱发地表裂隙率的时空统一分布模型,并实例分析了矩形火区引发地表线(张)裂隙率、面裂隙率以及剪裂隙率的分布及动态变化规律.地表线(张)裂隙率、面裂隙率和剪裂隙率的极大值分别分布在采(燃)空区边界内侧约20 m(约为煤层厚度的3~4倍)的位置、四周边界线的四个中点位置和四个边角端点所对应的地表区域.随着煤层燃烧,垂直于煤火发展方向上的线裂隙率以及空区边界处对应的地表面裂隙率均呈半正态曲线形式变化并最终稳定于最大值;而剪裂隙率、煤火发展方向上的线裂隙率及空区内部对应的地表面裂隙率均呈正态曲线形式变化.
Based on the theory of stochastic medium movement, the space-time unified distribution model of induced surface fissure rate induced by mining-affected underground coal fire is constructed and the distribution of surface tension (Zhang), surface fissure and shear fracture And dynamic variation law.The maxima of the surface line (Zhang) fracture rate, surface fracture rate and shear fracture rate are respectively distributed about 20 m (about 3-4 times of the coal seam thickness) Location, the four midpoints around the boundary line and the four corners of the endpoint corresponding to the surface area.With the coal seam fire, perpendicular to the line of fire in the direction of the development of the line rate and the boundary of the fracture area at the corresponding surface fracture rate All showed a semi-normal curve and finally stabilized at the maximum value. However, the shear fracture rate, the line fracture rate in the direction of coal fire and the corresponding surface fracture rate in the empty zone all showed a normal curve.