The Application Of Deep Foundation Pit's Deformation Monitoring And Prediction In Kunming

With the economy and the development of urbanization, the construction presents more and more to the upper air and the underground development tendency. The construction of multi-layered and high-rise buildings,large municipal facilities and and the development of a large number of underground space, will have a lot of deep foundation pit engineering and environmental geotechnical problems. Deep foundation pit's deformation monitoring and prediction is an important link in deep foundation design and construction. It is also one of hot topics in the field of geotechnical engineering research. How to ensure the foundation pit's own stable, and the active control the deformation of foundation pit to guarantee the project and environment's security, is an important content in the foundation pit's design,monitoring and construction.Based on previous studies, this paper take deep foundation pit in Kunming as the object of study, the main content:1) Based on the summary of the development and the characteristics of deep foundation pit in Kunming in recent years, from the necessity and importance of deep foundation pit's deformation monitoring and forecast, depth analysis of the structure of the pile anchor's mechanism and failure mode, then emphatically to analysis the deformation and deformation mechanism of deep foundation pit;2) In the analysis of deep foundation pit's safety monitoring system status on the basis of existing data, combined with problems in deformation monitoring, to discuss the forecasting methods of deformation of the deep foundation pit. To propose neural network method is more suitable for solving the deformation prediction of deep foundation pit;3) To combine with the characteristics of deep foundation pit is systems,nonlinear, Programs written in Matlab by used the network toolbox of Matlab to establish the time series model based on BP network. Then used this model to predict the displacement of deep foundation pit, by an engineering example shows that the model is simple and the results is good, has certain reference on the similar projects. 4) By used the programs written in Matlab, to predict the curves with time and depth of the deep horizontal displacement of soil, prediction results show that the overall shape of the curve is similar to "bow", and with the depth of excavation,the maximum displacement occurred by the beginning of the location of 0.5 m from the surface, to move to about half of the excavation depth. That is the H/2 up and down position.5)To apply the FLAC3D software, by making reasonable assumptions, to build a model to simulate the excavation and protections of pile anchor on the deep foundation pit. And compared the calculation of Li-Zhen software, to analyze the simulation results.