The Combination Model Of Grey Model And Time Series Analysis Model Applied To Subway Deep Foundation Pit Construction Settlement Forecasting

With the acceleration of urbanization in our country and the expansion of urbanization,urban traffic pressure increases,traffic congestion has become a serious problem for most of the city's economic development.The city subway is one of the main ways of the priority development with a small footprint,low noise,no barrier.However,subway station deep foundation pit excavation construction inevitably geotechnical structure of the whole underground damage,severe cases can produce collapse,directly affect the safety of subway construction.Aiming at the problem difficult to accurately predict the deformation trend of the single prediction model of deformation in subway station deep foundation pit construction,combined with the Shijiazhuang metro line three Line tower mound station deformation monitoring project,designes the deformation monitoring scheme of subway deep foundation pit,using GM(1,1)model and time series analysis model,and on this basis,combined model is set up.The results show that the two single model has its own advantages and limitations in the deformation prediction of deep excavation of subway station,at the same time,compared with the single model,the deformation trend of combined model has a significant improvement in the prediction accuracy,which provides a technical basis for the construction of the deep excavation of the subway station.