Deformation Prediction Of Pile-anchor Support Deep Foundation Pit Combined With BIM Technology And Neural Network

Pile anchor support structure has been widely used in deep foundation pit engineering due to its advantages of convenient construction,low cost and short construction period.The traditional design method of foundation pit should be conservative,when analyzed using finite element software tend to the details of the pile anchor supporting system to simplify the structure,and set up too much contact will greatly increase the computation time and manpower cost,so the development of three-dimensional finite element analysis of foundation pit have certain limit,can't well reflect the force deformation behavior of pile anchor foundation pit supporting,and need to introduce a new method to improve the problem.With the development of BIM technology in the engineering field,better application of BIM technology in foundation pit engineering is the direction of future development.However,nowadays,BIM technology still plays a simple role of visualization and construction guidance in the foundation pit field,and repeated modeling still exists in the preliminary foundation pit support design.In order to study the deformation prediction of pile anchor support in deep foundation pit,the following works are mainly done:1.Study the effective transformation method between BIM parametric model and ABAQUS analysis software,so as to combine the powerful modeling function of BIM with the geotechnical analysis capability of ABAQUS;2.Research pile anchor parameters in the support model of pile anchor foundation pit in ABAQUS and BIM import model: anchor anchor length,anchor placement inclination Angle and vertical support structure fixation depth;3.Use the global optimization ability of genetic algorithm to improve the traditional BP neural network,and verify the feasibility of this optimization method by using the data of finite element analysis.The genetic algorithm is used to carry out the preliminary optimization of pile-anchor parameters,providing reference for the selection of foundation pit support in the early stage;4.Verify the application of the research content of this paper in actual engineering by using the foundation pit engineering of north district of South China University of Technology,and provide references for similar projects.