基于颗粒单元接触的二维离散-连续耦合分析方法  

Coupling method of two-dimensional discontinuum-continuum based on contact between particle and element

作　　者：周健[1,2] 邓益兵[3,1] 贾敏才[1,2] 王家全[4] 

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]同济大学岩土及地下工程教育部重点实验室,上海200092 [3]上海海事大学海洋环境与工程学院,上海200135 [4]广西工学院土木建筑工程系,广西柳州545006

出　　处：《岩土工程学报》2010年第10期1479-1484,共6页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(90815008,50879059,50909057);高等学校博士学科点专项科研基金项目(200802470007);上海海事大学重点学科建设项目(2009445878)

摘　　要：结合离散单元法与有限差分法发展了离散–连续耦合分析方法。在中心区域采用离散元分析,其周围区域采用有限差分法分析。采用离散元中颗粒接触计算模型计算离散–连续交界面处的颗粒与单元相互接触作用,在连续单元中接触点速度按型函数对交界面处的节点速度进行插值,将与颗粒的接触力按权值函数分配到交界面节点上。通过PFC和FLAC的Socket I/O接口,实现二维离散–连续耦合分析,并通过对二维算例分析,表明了该耦合分析方法的有效性。A coupling method of two-dimensional discontinuum-continuum is proposed based on the combination of the discrete element method（DEM） and the finite difference method（FDM）.The DEM is used in the focus zone,and the finite difference method is used in the surrounding zone.The contact between the finite elements and the particle at the boundary edges follows the principles defined in the DEM.In the continuum element,the velocities at the contact point are related to the nodal velocities by interpolation,and the contact forces are contributed to the nodal forces with weight value.The FLAC and PFC are introduced to approach the coupling method by the socket connection.An example is presented to demonstrate the validity of the present method.

关 键 词：离散单元法 有限差分法 离散–连续耦合 细观力学 

分 类 号：TU431[建筑科学—岩土工程]