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A Multivariate Adaptive Regression Splines model for determining horizontal wall deflection envelope for braced excavations in clays

机译:用于确定粘土支撑开挖的水平墙挠度包络的多元自适应回归样条线模型

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摘要

The horizontal wall deflection of the braced excavations is influenced by many factors, including the excavation geometry, wall stiffness, soil parameters, struts spacing and so forth. In this study, three-dimensional (3D) finite element (FE) analyses were carried out to examine the corner restraining effects. A series of 3D FE analyses using the Hardening Soil (HS) model were carried out to investigate the effects of the strength of the clay, wall stiffness, excavation length, excavation depth and width, on the horizontal wall deflection envelope induced by braced-excavation in clays. Based on the results, a Multivariate Adaptive Regression Splines (MARS) model able to accurately learn the complicated implicit relationship between the maximum wall deflection envelope and these influential factors as well as the various interaction factors is developed. The developed MARS model is of good interpretability and enables the design engineer to estimate the shape of the wall deflection profiles. In addition, wall deflection profiles computed by this method compare favourably with a number of field and published records.
机译:支撑开挖的水平墙挠度受许多因素影响,包括开挖几何形状,墙体刚度,土壤参数,支柱间距等。在这项研究中,进行了三维(3D)有限元(FE)分析以检查拐角约束效果。进行了一系列使用硬化土(HS)模型的3D有限元分析,以研究粘土强度,墙体刚度,开挖长度,开挖深度和宽度对支撑开挖引起的水平墙挠度包络的影响在黏土中。基于这些结果,开发了一种多元自适应回归样条(MARS)模型,该模型能够准确地了解最大壁挠度包络线与这些影响因素以及各种相互作用因素之间的复杂隐式关系。所开发的MARS模型具有良好的可解释性,并使设计工程师能够估计壁变形轮廓的形状。此外,通过这种方法计算出的墙体挠度曲线与许多现场和公开的记录相比具有优势。

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