The Subway Station Deep Foundation Pit Ground Surface Deformation Rule And Prediction Research

With the speeding up of urbanization in our country,The number of large cities is growing,and the size of the city is developing rapidly,metro construction projects have sprung up with the development of the city.The construction of the metro station inevitably involved in deep foundation pit excavation,the deformation of surface caused by the excavation of foundation pit affects the construction safety.So,the study of deformation monitoring and prediction have important security means.The paper take DaLian Haizhiyun Station for example,study on the deformation caused by the excavation of foundation pit,study the prediction of the surface subsidence based on wavelet and time series combination forecasting model.Study contains the specific contents and the main conclusion centre on the problem as shown below:(1)The combination of DaLian Haizhiyun Station excavation on the surface settlement of deformation monitoring,wavelet thresholding method for processing sample data,the impact of the law were analyzed.(2)MATLAB software programming,establish wavelet and time series combination forecasting model,study the prediction of the surface subsidence by the wavelet and time series combination forecasting model.(3)Comparatived analysis the actual measurement data with the calculation results of time series forecasting model and wavelet and time series combination forecasting model,calculated the precision evaluation of the two models.(4)Calculated the surface subsidence caused by the excavation of foundation pit with numerical simulation software FLAG3D,comparatived analysis the actual measurement data with the calculation results of numerical simulation,analysised the destribution low of the surface subsidence.The results of the study shows that the predection of the surface subsidence by the wavelet and time series combination forecasting model has higher forecast accuracy,and more stable,analysised the destribution low of the surface subsidence.