Rotation errors in numerical manifold method and a correction based on large deformation theory

• 作 者: Ning ZHANG Xu LI Qinghui JIANG Xingchao LIN
• 机 构: School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China“,”Key Laboratory of
• 出 处: 结构与土木工程前沿
• 发表日期: 2019年5期
• 关键词: numerical manifold method rotation large deformation Green strain open-close ite

Numerical manifold method (NMM) is an effective method for simulating block system,however,significant errors are found in its simulation of rotation problems.Three kinds of errors,as volume expansion,stress vibration,and attenuation of angular velocity,were observed in the original NMM.The first two kind errors are owing to the small deformation assumption and the last one is due to the numerical damping.A large deformation NMM is proposed based on large deformation theory.In this method,the goving equation is derived using Green strain,the large deformation iteration and the open-close iteration are combined,and an updating strategy is proposed.The proposed method is used to analyze block rotation,beam bending,and rock falling problems and the results prove that all three kinds of errors are eliminated in this method.