FEM Analysis Of Inner Bracing Soldier Pile Retaining Structure Of Deep Foundation Pit And Surface Settlement Forecasting In Bin Hu Soft Clay Area

Buildings adjacent to an excavation may be damaged when the differential settlement induced by the excavation is greater than the allowable differential settlement of the buildings. The estimation of ground surface settlement around an excavation thus becomes an essential task of building protection. Finite element method(FEM) is often employed to model complex soil structure interaction problems such as braced excavations. The accuracy predictions by FEM can be significantly improved if selecting a proper soil constitutive model. Although the deflection of the braced wall can generally be predicted well using a routine FEM analysis, the prediction of settlement is usually not as accurate.In this paper, basis of comparison among the numerical results form commonly-used constitutive models, selecting a constitutive to numerical analysis. According to engineering geology exploration report of Chao Hu soft soil and on the basis of reasonable selection of corresponding material parameters, the two-dimensional finite element numerical calculation model of foundation pit retaining structure with inner-bracing soldier pile retaining structure is established. Meanwhile, the effect of factors, such as burial depth of the pile, the stiffness of the pile, etc...,on the pit deformation an change laws is analyzed using the numerical simulation method. A large number of artificial data are generated through finite-element analyses. These data, using linear regression model and BP network model, provide the basis for developing ground-surface settlements. The following main conclusions can be reached:(1)By using the linear elastic model, MC model and HS model as the foundation pit excavation in the finite element analysis of constitutive model for simulation of excavation, it can be found the constitutive model would be reasonably good in the deformation analysis in foundation pit engineering. And using a practical foundation pits to validate.(2)According to engineering geology exploration report of Bin Hu soft soil and selection of soil constitutive models and their corresponding parameters, the two-dimensional finite element numerical calculation model of foundation pit retaining structure with inner-bracing soldier pile retaining structure is established. Meanwhile, the effect of factors on the pit deformation an change laws is analyzed using the numerical simulation method.(3)The data which are generated through finite-element analyses are using multiple linear regression model and BP neural network to estimate of ground surface settlement. It can be found BP neural network would be more suitable to estimate ground surface settlement.