条带开采中覆岩运移规律的探讨

Discussion on overlying strata movement law in strip mining

针对条带开采覆岩内部的移动变形机理的问题,采用离散元数值分析研究条带开采覆岩内部的移动变形特征。研究结果表明:条带开采覆岩内部下沉呈现"三带"发展规律,由下往上依次为压缩带、平稳带、弱化带;证实地表下沉主要由条带采空区压力拱两侧伴有附加应力的顶底板煤岩柱自我压缩依次累积而成;表土层起到消化吸收地表移动变形作用;表土层越厚、表土层内部消化吸收的相对变形量越大。

Based on inner movement deformation mechanism in strip mining, discrete element numerical analysis was adopted to study the problem above. The result showed that strip mining overlying strata subsidence with sequence as compressed belt, smooth belt, weaken belt, the ground subsidence was caused by accumulation self compression of roof and floor of coal and rock pillars in strip goaf pressure subsidiary stress, the surface layer balanced the ground movement deformation, the thicker the surface layer, the larger relative deformation of surface layer balanced.