被动桩群桩-土相互作用的三维限元分析-毕业论文外文翻译.docx

英文原文3D finite element analysison pile-soil interaction of passive pile group1 IntroductionThe majority of piles are designed to support “active” loads, that is, loads from superstructure are directly transferred to the pile foundation by the cap. However, in many cases, piles are not designed to withstand “passive” loads, which are created by the deformation and movement of soil surrounding the piles due to the weight of soil and the surcharge. These passive loads may lead to structural distress or failure. Examples of these cases include piles supporting bridge abutments adjacent to embankment, existing pile foundations adjacent to pile driving, excavation or tunneling operations, and pile foundations in moving slopes.Several empirical and numerical methods have been proposed for analyzing the response of single pile and pile group subjected to lateral loading from horizontal soil movements. A comprehensive review on these methods has been made by STEWART et al. Most of the numerical methods that have been proposed utilize the finite element method or the finite differential method. For pile groups, the plane strain finite element method was adopted by STEWART et al. In the study by STEWART et al, the piles were represented by equivalent sheet-pile walls. The behavior of sheet-pile wall system was assumed to be dependent on predetermined relationship between thepressure and relative soil displacement (soil movement past piles), and the soil-pile interaction was not modeled. In a later study，BRANSBY and SPRINGMAN used three dimensional finite element method, in which relatively coarse mesh was used due to limited computing capacity at that time, and the distribution of soil contact stress around piles was not investigated. In fact, this type of pile-soil interaction involves nonlinearities such as plasticity of soil, large displacement and pile-soil contact. The influencing factors of the nonlinearity include properties and depth of soft soil layer, diameter, number