Research on deformation prediction of prefabricated metro station foundation pit based on grey system theory
Prefabricated metro station foundation pits shall withstand the cyclic heavy loads of large prefabricated components lifting at a later stage during the construction process,and their deformation issue are particularly important for the safe and efficient construction of the station.The grey system theory is widely used in the prediction of foundation pit deformation,in which the grey GM(1,1)model is more commonly used,while the grey GM(2,1)model is less frequently used.In this article,the GM(1,1)model and GM(2,1)model in the grey system are used to predict and analyze the data of two monitoring points of the prefabricated station foundation pit,and the results of the two models are compared,and it is concluded that the accuracy of the GM(1,1)model and GM(2,1)model are all"first level"(excellent)after the posterior difference test analysis.Compared with the prediction of GM(1,1)model,the average relative error of GM(2,1)model in the prediction of the two measurement points is less than 5%,and the relative error of the prediction result of GM(2,1)model is smaller.In the simulation and prediction of foundation pit deformation data,it is closer to the actual value and has higher prediction accuracy,which has good application value.
metro stationprefabricatedgrey systemGM(1,1)modelGM(2,1)modelfoundation pit deformationprediction
NETL
NSTL
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