煤巷层状顶板压曲破坏现象分析

Study on the layered roof compression-bending failure of roadways in coal seam

将煤巷顶板层状岩层视为薄板 ,按两端固支和简支边界条件 ,导出了压曲临界应力计算公式 .结果表明 ,临界应力与厚垮比及边界条件关系密切 ,据此指出顶板岩体结构和工程尺寸是顶板稳定性的决定性因素 .

The layered roof rockstrata of roadways in coal seam has been treated as thin plate. On the boundary condition of two sides rigid fixing and joint hinge, the compression-bending adjoin stress formula has been educed. It is indicated by the formula that compression-bending stress is closely relevant to the boundary condition and the rate of thickness and span. Therefore, the distribution of structural surface in roof is the determined factor of roof stability. It is qualitatively put forward that the supporting mechanism of bolt is enlarging the adhesion of bedding joint and decreasing span.