粗粒料力学特性的DDA数值模拟  

Numerical Simulation of Mechanical Characteristics of Coarse Granular Materials by Discontinuous Deformation Analysis

作　　者：郭培玺[1] 林绍忠[2] 

机构地区：[1]河海大学岩土工程研究所,南京210098 [2]长江科学院非连续变形分析实验室,武汉430010

出　　处：《长江科学院院报》2008年第1期58-60,69,共4页Journal of Changjiang River Scientific Research Institute

基　　金：国家自然科学基金;二滩水电开发有限公司雅砻江水电开发联合研究基金资助项目(50639050)

摘　　要：采用非连续变形分析方法(DDA)研究粗粒料的力学特性。研究了二维粗粒料颗粒的随机生成方法,按照粗粒料级配曲线随机生成松散分布的颗粒,应用DDA模拟重力作用下颗粒在承模筒内的下落过程并形成相互接触的堆积体,以此建立粗粒料数值模拟试验模型。参照粗粒料室内三轴试验的加载过程,应用DDA进行粗粒料力学特性的数值模拟试验,所得应力应变曲线与三轴试验曲线基本吻合,说明DDA数值模拟应用于粗粒料力学特性的研究是可行的。文中还给出了反映颗粒相互作用的若干组构要素的分布情况。In this paper, DDA （discontinuous deformation analysis） is used to study the mechanical characteristics of coarse granular materials. In order to establish the numerical simulation specimen, the 2-D random particle-generating algorithm of granular materials is studied. Loose particles are randomly generated according to the gradation curve. Under the action of the gravitational load, the packing process of the particles inside a rectangular container is simulated by DDA so that a heap of the particles which contact each other is formed. On the basis of the heap, the specimen is then established. With reference to the loading process of the tri-axial laboratory test, 2-D numerical simulation on the mechanical characteristics of coarse granular materials is performed aiso by the DDA. The stress-strain curves obtained by the numerical simulations are basically in agreement with the results by the tri-axial laboratory test. It indicates the numerical simulation is suitable for the mechanical characteristic research of coarse granular materials. In addition, the distribution of several fabric elements about interaction between particles is also presented.

关 键 词：粗粒料 随机分布 力学将性 数值分析 DDA 

分 类 号：TV41[水利工程—水工结构工程]