Analysis Of Internal Force And Deformation Of Strip Foundation Under The Action Of Superstructure And Residual Deformation

The calculation of internal force and deformation of strip foundation is affected by two factors: the upper load and the residual deformation of the old goaf.At present,the research on the interaction between the upper structure and the strip foundation and the residual deformation of the old goaf is more mature,However,the influence of the two factors on the internal force and deformation of the strip foundation has not been mature.Based on the previous research results,considering the influence of quasi residual deformation and superstructure to the deformation and internal force of strip foundation,establishing the analysis model of the interaction between superstructure and strip foundation under the influence of residual deformation of old goaf,calculating the formula for the internal force and deformation of strip foundation under the influence of residual deformation and superstructure.Then,establishing the overall numerical model of the superstructure,strip foundation and foundation by the finite element analysis software ANSYS,and analyzing the deformation and internal force of strip foundation under different factors.The specific work done in this paper is as follows:Based on the probability integral method,the residual settlement prediction model of the old goaf is presented,and the rationality of the method is verified by an engineering example;Considering the interaction of superstructure,strip foundation and foundation,On the basis of Kerr's theory of foundation beam,the formula for calculating the settlement of strip foundation above old goaf is obtained;Deriving the fomula of the final settlement calculation method of strip foundation under the influence of upper load and residual deformation.And establishing a theoretical model,The validity of the formula is proved by comparing the calculated results with the simulation results;then analysizing thesettlement deformation and internal force change of strip foundation under the influence of four factors:foundation stiffness,residual deformation curvature,Residual deflection and foundation soil compressionmodulus.