基于数值模拟的采空区上覆岩层变形的分析

Deformation Analysis of Overlying Strata in Goaf Based on Numerical Simulation

针对采空区对地表的后期影响,结合山西某矿采空区上覆岩层的特性,利用数值模拟软件对采空区上覆岩层的变形进行研究,分析了采空区地表盆地的变形和地表各点的应力特性。分析结果表明:盆地边界点至拐点间倾斜渐增,拐点至中心点倾斜逐渐减小,在采空区中心处倾斜为0°;最大负曲率位于采空区中心附近;最大拉伸值位于边界点与拐点之间;最大压缩值位于采空区中心点;采空区中间区域水平移动小,反而采空区边缘区域水平移动较大;最大拉应力位于采空区顶板的两边缘处。

In view of the later influence of goaf on the surface,the deformation of overlying strata in goaf is studied by using numerical simulation software combined with the characteristics of overlying strata in goaf of Shanxi Province,and the deformation of surface basin and the stress characteristics of each point in goaf are analyzed.The results show that the tilt between boundary point and inflection point of basin increases gradually,and the tilt from inflection point to central point decreases gradually,and the tilt is zero at the center of goaf.The maximum negative curvature is near the center of the goaf,the maximum tensile value is between the boundary point and the inflection point,and the maximum compression value is located at the central point of the goaf;the horizontal movement of the middle area of the goaf is small,but the horizontal movement of the margin area of the goaf The maximum tensile stress is located on both sides of the goaf roof.