The study on the forces and deformations of multi-storey frame construction on goaf

摘要

Reconstruction is an important aspect of goaf utilization. The 3D finite element models of multi-storey frame construction were established by software ANSYS, lots of calculation and analysis are carried out about the different residual curvature deformation after construction. Study the effects of foundation soil's compression modulus, foundation stiffness, and cushion to frame's forces and deformations on goaf. The results show that basement subsidence decrease with the increasing of soil's compression modulus, meanwhile, the forces and deformations of the upper structure have different degrees of change. Foundation stiffness the greater the smaller the basement subsidence. The differential settlement and the forces change of superstructure decrease with the foundation stiffness increasing. And setting cushion could form weak plane between foundation and soil, which reduce effect of residual curvature deformation on foundation, the influence of curvature deformation is not obvious to the upper structure. As few mature experience can be used for reference, exploratory research results above have theoretical guidance meaning and popularization value for engineering practice.