Deformation Analysis Of Pile-anchor Supporting Foundation Pit And Secondary Development Of ABAQUS GUI

Based on a pile-anchor retaining foundation pit in Beijing,the soil deformation of the foundation pit is studied by monitoring data analysis and ABAQUS three-dimensional numerical simulation.The monitoring results were compared with the simulation results,and the reasons for the differences were analyzed.In addition,this paper uses Python language to develop the foundation pit analysis platform of pile-anchor support,and designs a humanized man-machine interaction window,which realizes the functions of rapid parametric modeling,automatic submission calculation and automatic post-processing of Pile-anchor support foundation pit,and improves the analysis efficiency.The work carried out and the conclusions reached are as follows:(1)Monitoring data show that displacement of pile top,settlement of ground surface and tension of pre-stressed anchor cable increase with the excavation of foundation pit,and convergence of foundation pit floor after construction.All data have not exceeded the allowable value of the code and design,and the foundation pit has been in a stable state.(2)Comparisons show that the trend of numerical simulation results is similar to that of monitoring data,but the simulation results are small.(3)The numerical simulation shows that the early settlement of the foundation pit mainly occurs in the overload area.After the excavation of the foundation pit,a settlement groove is formed at about 20 meters away from the foundation pit;the influence range of the horizontal displacement of the soil is about 45 meters;the slope measurement curve obtained by the simulation shows that with the increasing excavation depth and the construction of the prestressing anchor cable,the maximum displacement of the pile body moves down continuously,and the prestressing anchor cable influences the pile body.The limitation of displacement is obvious.After completion of construction,the maximum displacement point is-12.5m.(4)After testing and verification,the modeling and analysis platform of Pile-anchor support compiled in this paper can achieve the following functions:(1)Parametric modeling of foundation pit supported by piles and anchors automatically generates arbitrary anchors,automatically stratifies the soil model and automatically assigns material attributes.Grid density control and automatic partition.(2)Obtain information from user input parameters,automatically assemble components to the correct position,and intelligently generate the analysis steps needed for calculation.(3)Users select and calculate the required constitutive model according to their needs.The constitutive model is divided into MC model and DP model.When DP model is adopted,the program automatically converts MC parameters into DP parameters.(4)Automatically create tasks and submit calculations.When the calculation is completed,the soil displacement nephogram,soil settlement curve and pile inclination curve are automatically displayed.