High-rise Building Raft Foundation And Foundation Interaction Numerical Simulation And Experimental Research

With the development of engineering construction, the scale of city and the number ofhigh-rise building are increasing gradually. It has become a hot spot of engineeringexploration that how to save cost and shorten the construction period in the engineeringconstruction under the precondition of safe and reliable. In this case, the raft foundation hasgot been more and more widely used.Raft foundation has have a few good features,such asgood integrity, high efficiency, simple technology and short construction period. Thus the theupper structure of high-rise building, raft foundation and foundation interaction problemshave also been take more and more attention.This paper studys the raft foundation and foundation combined action mechanism in thehigh-rise building,which considering the influence of the upper structure. This studyintroduces the analyze the mechanism of the interaction and expounds influence of the upperstructure stiffness and foundation stiffness and foundation stiffness to subgrade action.ThenUsing ABAQUS finite element software to carry on the numerical simulation, this paperanalyzes the factors which influence the basis and foundation interaction,such as raftthickness and width of the cantilever construction. This study carry on the in situ test and theanalysis of experimental data to verify the accuracy of the numerical simulation,which basedon engineering examples. The research content has the following several aspects:(1) Using the ABAQUS finite element software to simulate the upper structureconstruction by layers,then analys the influence of the interaction of basis and foundation.(2) This research studys the influence of raft thickness and width of the cantilever raft onthe subsidence, basal reaction and the internal force of raft through numerical simulation.(3) A test to cell calibration and characteristic modeling is presented. Combined with thepractical situation of engineering,the cell parameters are fixed.(4) For settlement observation, earth pressure cells and reinforcement stress test andin-situ test, analysis of the characteristics of stress and deformation of raft.The main conclusions of this paper:(1) The upper structure stiffness adjusts foundation differential settlement and basalreaction obviously, after seven layers, the upper structure stiffness contribution not veryobviously.(2) The influence of the increasing of the raft thickness to regulate raft differentialsettlement is obviously, but at the same time increased the raft average settlement, andproduced larger secondary internal force in the raft.(3) Increasing raft cantilever width can alleviate raft edge basal reaction concentration, but the raft differential settlement is not completely and decreased with the increase of thewidth of the cantilever.(4) The parameters of cells need to be modified by embedded environments and differentmethods, the air tightness of the cell has larger influence to its performance.