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为研究急倾斜特厚煤层水平分段综放开采顶板破断特征,基于急倾斜特厚煤层工作面顶板赋存条件并结合弹性力学,建立了急倾斜特厚煤层水平分段开采顶板力学模型。通过力学模型分析,推导出急倾斜特厚煤层水平分段开采后顶板沿工作面倾向方向的岩板破断判据及挠度公式,应用三角级数方法对挠度公式进行求解,确定了顶板沿倾向方向上最大挠度发生的位置关系式。理论研究成果在乌东矿南采区B1+2急倾斜特厚煤层水平分段综放开采中的工程应用表明,工作面沿倾向方向上推进到385 m时顶板发生破断,倾向方向顶板最大挠度坐标位置为y=325.78 m,顶板沿工作面倾向方向的最大挠度位于采空区中部偏下位置。表现为急倾斜特厚煤层顶板在工作面上方的非对称性破断;相似材料试验进一步验证了顶板挠度公式的合理性。
In order to study the roof breaking characteristics of horizontal section fully mechanized top coal caving mining in steep-inclined and ultra-thick seams, the roof mechanics model of horizontal section mining in steep-inclined and ultra-thick coal seam was established based on the roof extremity conditions in the steep-inclined and ultra-thick coal seam combined with elastic mechanics. Based on the analysis of mechanics model, the criterion of rock breaking and the formula of deflection of the roof slab along the working face in the horizontal direction after horizontal mining are derived. The formula of deflection is solved by the method of trigonometric series, The maximum deflection occurred on the location of the relationship. The results of theoretical research The engineering application in the horizontal section fully mechanized caving mining of B1 + 2 steep-inclined and special thick seam in the south mining area of Wudong Mine shows that the roof is broken when the working face is advanced to 385 m in the trend direction and the maximum deflection The coordinate position is y = 325.78 m. The maximum deflection of the roof slab along the working face is located at the middle of the goaf. It is shown that the roof of the steeply-sloped and ultra-thick coal seam is unsymmetrically broken above the working face. Similar material tests further verify the rationality of the roof deflection formula.