不同荷载作用下老采空区地表残余变形数值模拟研究——以淮南某矿工业广场为例

Numerical Simulation Study on Law of Surface Residual Deformation of Old Goaf under Different Load

目的针对建筑荷载对老采空区的影响,建立数值模型对地表残余变形进行研究,分析在不同荷载作用下煤矿区老采空区地表残余变形规律,并揭示老采空区二次变形机理。方法以淮南某矿工业广场为研究区,采用FLAC3D数值模拟方法反演老采空区上方地表在不同建筑荷载下残余变形特征。结果老采空区中间区域地表残余变形最小,外边缘区其次,内边缘区最大;荷载位置不变,地表残余变形随荷载增大而增大。结论在老采空区域,地表受到新建建筑位置及建筑荷载大小的影响。因此,在老采空区新建建筑物要考虑地表残余变形,选择合适位置,限制建筑物的层数,同时采用适当的抗变形技术措施。

Object In view of the influence of building load on old mined out area,a numerical model was established to study the residual deformation of ground surface.The residual deformation law of goaf in old goaf under different loads was analzed,and the two deformation mechanism of old goaf was revealed.Methods By taking an industrial square in Huainan as the research area,the residual deformation characteristics of the surface above the old goaf under different building loads were inversed by FLAC3D numerical simulation method.Results The results showed that the surface residual deformation in the middle part of the old mined out area was the smallest,followeed by the outer edge area,and the largest in the inner edge area;when the load position was constant,the residual deformation of the ground surface increased with the increase of load.Conclusion In old mined out area,the ground surface is affected by the location of new building and the magnitude of building load.Therefore,in the old goaf,the new building should consider the residual deformation of the ground surface,select the appropriate location,limit the number of buildings,and adopt appropriate anti-deformation technology measures.