某金属矿体充填开采对地表建(构)筑物稳定性的耦合评估

Coupling Evaluation of Surface Building (Structure) Stability During Filling and Mining of a Metal Ore Body

为研究某金属矿山地下开采对地表建(构)筑物稳定性影响,综合运用理论分析、三维精细化建模、数值模拟分析方法,提出了一种地表建(构)筑物稳定性评估的耦合方法。结果表明:采用充填法开采,地表整体为均匀沉降,对地表建(构)筑物的稳定性影响较小,最大主应力随回采步骤的增加呈多项式增长趋势,最小主应力呈线性增长;通过理论分析计算,矿区地表变形值及质点振速均小于相关规程要求的临界值;各塑性区范围均较小,充填开采可有效避免拉伸、剪切破坏区域进一步扩大;矿体回采使得矿体正上方地表呈锥状下沉,矿区地表变形值均远小于规范中的临界变形值。地下开采不会对地表建(构)筑物产生影响。

In order to study the influence of underground mining on the stability of surface structures in a metal mine,a coupling method for evaluating the stability of surface structures is proposed by using the⁃oretical analysis,3D fine modeling and numerical simulation analysis.The results show that the whole sur⁃face of the filling mining method is uniform settlement,which has little influence on the stability of the sur⁃face structures.The maximum principal stress increases polynomial with the increase of mining steps,and the minimum principal stress increases linearly.Through theoretical analysis and calculation,the surface deformation value and particle vibration velocity of mining area are less than the critical value required by relevant regulations.The range of each plastic zone is small,and filling mining can effectively avoid further expansion of tensile and shear failure areas.The mining of the ore body causes the surface of the ore body to sink in a cone shape,and the surface deformation value of the mining area is far less than the critical defor⁃mation value in the code.Underground mining will not have an impact on surface structures.