采空区上方建筑物地基附近的地表沉陷

根据载荷作用线上水平位移的特征和采空区上覆岩层破断后的结构形态,确定了位移边界条件;给出了采空区上方任意点的沉降位移、地表沉陷、地表水平位移以及建筑群引起的地表沉陷;探讨了在采空区和建筑物载荷的共同作用下地表的移动特性。研究结果表明:建筑物引起的地表沉陷与建筑物和采空区的相对位置有关;建筑物附近的地表下沉随着采空区上覆岩土层厚度的增加而减小,呈非线性变化;在沉降范围内,建筑物两侧地表的水平位移均匀分布,方向相向,均指向建筑物。

Research on the surface subsidence about building foundation above mine goaf

The displacement boundary condition was determined according to characteristic of horizontal displacement and structure configuration of fractured covers.The compute formulas for settlement displacement,surface subsidence and surface horizontal displacement were derived and surface subsidence for building groups was determined in accordance with characteristics of the structural form of top rock layers.The results indicate that the surface subsidence is related to relative location between the building and the goaf,that means the surface subsidence about building foundation decreases with the increasing rock and soil mass thickness above the mine goaf with nonlinear characteristics,and in the range of the surface subsidence the horizontal displacements are of even distribution and their directions are against with each other,both towards the building.