【摘要】 基坑开挖对临近桥梁的影响越来越受到工程界的重视,但是对群桩高速铁路梁桥影响的研究不多且缺少三维分析和二维分析的对比研究.结合工程实际,应用ABAQUS有限元软件对某高速铁路桥附近基坑开挖建立三维有限元模型,分析其墩顶水平位移、桩-墩沿深度方向的水平位移和墩顶竖直位移.其次,鉴于三维分析中复杂的建模过程、较高的硬件配置要求和较长的计算时间,提出了二维有限元简化方法.通过对三维模型和二维模型的分析,比较了各自的优势和劣势,为类似分析和施工提供有意义的参考.更多还原

【Abstract】 The issue which has been play more and more attention is the detrimental effect of foundation pit excavation-induced soil movement on adjacent bridges;while the analysis of effects on high-speed railway bridge pile group didn’t study enough;and it is lack of comparative study of three-dimensional analysis and two-dimensional analysis.Combining with practical engineering,the foundation pit excavation on adjacent high-speed railway bridge pile group is simulated by using finite element software ABAQUS;and the pier’s top horizontal displacements,vertical displacements and horizontal displacements of piles and piers along the depth direction are analyzed.Secondly,in light of the complex three-dimensional analysis of the modeling process,high hardware configuration requirements and long computation time,a simplified two-dimensional finite element method is put forward.The results are analyzed according to elastoplastic model and elastic model.Finally,for analyzed three-dimensional model and two-dimensional model,their advantages and disadvantages are compared,so as to provide meaningful reference for similar analysis and construction.更多还原