3D Deformation Monitoring Of Foundation Pit Management Information System Development

Since the reform and opening up,especially since the "13th Five-Year Plan",China’s urban building construction has ushered in new changes.With the continuous emergence of high-rise and super high-rise buildings above ground,the use and utilization of underground space,both horizontally and vertically,are being expanded and extended.This inevitably requires that the scale of foundation excavation during the construction of building projects is expanded accordingly,the foundation pit construction environment becomes increasingly complex,and the construction difficulty,construction standards and safety requirements become higher and higher.The traditional construction management mode of documentation is no longer able to meet the growing demand for fast information transfer and intuitive image presentation.Therefore,it is imperative to establish a networked online shared pit construction management platform,starting from a 3D model of the pit.In this paper,firstly,the 3D model of foundation pit is constructed based on the series data of foundation pit surface deformation monitoring points and information about foundation pit support structure,and BIM technology is applied to complete the construction of the 3D model of foundation pit.Finally,the web-based visualisation,system back-end development and frontend data interaction technologies were applied to develop a web-based 3D deformation monitoring and management information prototype system for foundation pits.The main work and research results of the thesis are as follows:(1)Realization of 3D modelling technology exploration and 3D model visualization of foundation pits.Firstly,the current situation of the development of 3D foundation pit model was studied,the characteristics of different modelling techniques were analysed,and then a more suitable BIM technique was selected for modelling;based on the elevation point data of the foundation pit terrain surface and the foundation pit support structure data,Revit software was selected to complete the construction of the 3D model of the foundation pit;with the help of Three.js engine on the web side,the loading and presentation of the 3D model was completed,and some The basic interactive functions were added.(2)Realisation of foundation pit slope deformation prediction function.Based on the horizontal displacement data and settlement data of foundation pit slopes in the past,the SSALSTM network model was used to predict the deformation of the slope monitoring points,and the prediction effect was evaluated by using evaluation indexes;the prediction algorithm model developed based on Matlab was integrated to classify the target deformation risk and realise the prediction of foundation pit slope deformation on the web side.(3)Develop a prototype foundation pit deformation monitoring and management information system.Through requirement analysis and overall design,a web-based prototype foundation pit 3D deformation monitoring and management information system was developed based on the back-end framework and front-end development.The system is a plug-in-free,easy-to-extend,cross-platform B/S architecture information sharing platform,which can realize practical functions such as 3D model visualization of foundation pit projects,deformation prediction,daily management and analysis of monitoring data,and is a powerful tool for foundation pit construction management and even architectural design decision-making.