摘要
为精确模拟岩体断裂的演化过程,将有限单元法与圆化多面体离散元法相结合,提出一种用于模拟断裂全过程的三维可变形圆化多面体离散单元法。为模拟块体的真实破坏状态,该方法将每个岩体颗粒都离散成有限单元,沿有限单元的边界嵌入无厚度节理单元,最后采用判断节理单元状态的方式来捕捉断裂过程产生的裂缝,岩体颗粒与断裂表面之间的接触相互作用通过圆化多面体离散元法求解。通过5个算例说明新方法的准确性和有效性,可用于模拟准脆性材料的断裂全过程,且能够捕捉裂缝萌生和扩展以及块体之间的碰撞和变形。
In order to accurately simulate the evolution process of fractures,a three-dimensional deformable spheropolyhedral-based discrete element method is proposed by combining the finite element method with the spheropolyhedral-based discrete element method to simulate the complete fracture process.This method simulates the failure state of rock masses in real life,discretizing each rock particle into a finite element and embedding the zero thickness joint element along the boundary of the finite element.Finally by judging the state of the joint element,the cracks generated during the fracture process are captured,and the contact interaction between rock particles and fracture surfaces is resolved by the spheropolyhedral-based discrete element method.The accuracy and effectiveness of the new method are demonstrated through five numerical examples.The numerical results show that the proposed method is feasible in simulating the complete fracture process of quasi-brittle materials,and can capture crack initiation and propagation,as well as collision and deformation between fragments.
作者
张德沧
毛佳
戴妙林
邵琳玉
赵兰浩
ZHANG Decang;MAO Jia;DAI Miaolin;SHAO Linyu;ZHAO Lanhao(College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210024,China)
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2024年第9期1974-1983,共10页
Chinese Journal of Geotechnical Engineering
基金
国家重点研发计划项目(2022YFC3005402)
国家自然科学基金项目(52009034)
河海大学水安全与水科学协同创新中心项目。
关键词
圆化多面体离散元法
有限单元法
断裂
节理单元
准脆性材料
spheropolyhedral-based discrete element method
finite element method
fracture
joint element
quasi-brittle material
