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三维快速拉格朗日分析是基于三维显式有限差分法的数值分析方法 ,它可以模拟岩土或其他材料的三维力学行为 ,可以准确地模拟材料的屈服、塑性流动、软化直至大变形 .由于采用显式差分法 ,它尤其适合于材料的弹塑性、大变形分析以及施工过程的模拟 .为此简要介绍了三维快速拉格朗日分析的基本原理及其特点 ,然后应用美国 Itasca Consulting Group,Inc.开发的三维快速拉格朗日分析程序 FLAC-3 D,以小湾拱坝为例说明了其在拱坝稳定分析中的应用
3D fast Lagrangian analysis is a numerical analysis method based on three-dimensional explicit finite difference method, which can simulate the three-dimensional mechanical behavior of geomaterials or other materials and accurately simulate the yielding, plastic flow and softening of materials until large deformation. It is especially suitable for the material elasto-plasticity, large deformation analysis and the simulation of the construction process by using the explicit difference method.This paper briefly introduces the basic principles and characteristics of the three-dimensional fast Lagrangian analysis, and then uses the American Itasca Consulting Group, Inc. developed a three-dimensional fast Lagrange analysis program FLAC-3 D, to Xiaowan arch dam as an example to illustrate the application of the stability analysis of the arch dam