Numerical Simulation Study On Deformation Of Deep Foundation Pit Support Based On Different Constitutive Model

With the combination of civil engineering and computer science,the emergence of finite element software provides great convenience to people.But there are many constitutive models in finite element,and different constitutive models will have differences in simulation.Taking the deep foundation pit support engineering of a building in Shenzhen as the research object,this paper chooses typical row piles,anchor rope support 1-1 section,2-2 section and row piles support 3-3 section,uses MC,DP and MCC constitutive models to simulate ABAQUS,and obtains the horizontal displacement of support piles,the vertical displacement outside the pit surface and the curve of Anchor Cable axial force.Finally,the comparison and analysis with the measured and designed values are made,and the following conclusions are drawn.(1)The support design of deep foundation pit is carried out by Lizheng 7.0.After comparison,1-1 section,2-2 section and 3-3 section are selected for analysis.After calculation,the support design of three sections can be adopted.(2)After comparing several commonly used constitutive models,Mohr-Coulomb,Drucker-Prager and Modified Cambridge models are selected to simulate and analyze the typical 1-1 section,2-2 section and 3-3 section of row pile anchor support.(3)Based on the monitoring data and design values of the foundation pit,the horizontal displacement of the retaining pile,the vertical displacement of the surface outside the pit and the axial force of the anchor cable are compared and analyzed with the three constitutive models.(4)After comparing and analyzing the results of numerical simulation and measured value of foundation pit support,the MC model can be used to simulate the 1-1,2-2 and 3-3 sections in general,and the results are close to the actual engineering results.The rationality of the numerical simulation method,the practicability of the constitutive model and the reliability of parameter selection are verified.At the same time,the constitutive model and parameter selection scheme suitable for the local soil body are determined,which provides some reference value for the future design and construction of geotechnical engineering in this area.