采动底板破坏特征,对于带压开采具有重要意义。以文明矿为试验矿井,采用分段注水装置、钻孔电视系统、地质雷达对大采深特厚倾斜煤层综放开采底板破坏深度进行探测,并对采动前后底板裂隙数量与钻孔深度、裂隙宽度与数量进行数字化分析,并就采动后底板应力变化和塑性区特征进行数值模拟试验,数据结果表明:文明矿大采深倾斜特厚煤层综放开采底板破坏深度为30.1 m;采动前裂隙数量较小,而采动后裂隙数量呈上升—下降—不变的形态分布;采动前底板裂隙宽度以小于5 mm为主,采动后裂隙宽度以16~20 mm为主;工作面下方支承压力集中系数大于上方;底板垂直应力曲线在倾斜方向上呈“勺形”分布且卸压程度随着底板深度增加而逐渐降低并形成了较大的塑性破坏区。 Mining floor damage characteristics, with pressure mining is of great significance. Using civilized mine as pilot mine, sub-section water injection device, borehole television system and geological radar were used to detect the failure depth of fully mechanized top coal caving mining caving mining face with deep extra-thick and extremely thick coal seam. The number of fissures and drilling depth, The width and the number of cracks are digitally analyzed, and the stress variation and plastic zone characteristics of the bottom floor after mining are numerically simulated. The results show that the destructive depth of fully mechanized top coal caving mining deep mining thick inclined seam is 30.1 m; The number of front cracks is small, and the number of fractures after mining is in a rising-falling-invariant morphological distribution; the crack width of the floor before mining is less than 5 mm, and the width of the crack is mainly 16-20 mm after mining; The pressure coefficient of support under the surface is larger than that of the top. The vertical stress curve of bottom plate is distributed in a “spoon-shaped” shape in the inclined direction and the pressure relief degree gradually decreases with the increase of the depth of the bottom plate and forms a large plastic failure zone.