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基于颗粒离散元法的连接键应变软化模型及其应用

冯春 李世海 刘晓宇

冯春, 李世海, 刘晓宇. 基于颗粒离散元法的连接键应变软化模型及其应用[J]. 力学学报, 2016, 48(1): 76-85. doi: 10.6052/0459-1879-15-288
引用本文: 冯春, 李世海, 刘晓宇. 基于颗粒离散元法的连接键应变软化模型及其应用[J]. 力学学报, 2016, 48(1): 76-85. doi: 10.6052/0459-1879-15-288
Feng Chun, Li Shihai, Liu Xiaoyu. PARTICLE-DEM BASED LINKED BAR STRAIN SOFTENING MODEL AND ITS APPLICATION[J]. Chinese Journal of Theoretical and Applied Mechanics, 2016, 48(1): 76-85. doi: 10.6052/0459-1879-15-288
Citation: Feng Chun, Li Shihai, Liu Xiaoyu. PARTICLE-DEM BASED LINKED BAR STRAIN SOFTENING MODEL AND ITS APPLICATION[J]. Chinese Journal of Theoretical and Applied Mechanics, 2016, 48(1): 76-85. doi: 10.6052/0459-1879-15-288

基于颗粒离散元法的连接键应变软化模型及其应用

doi: 10.6052/0459-1879-15-288
基金项目: 国家科技支撑计划(2012BAK10B00),国家自然科学基金青年基金(11302230,11302229)资助项目.
详细信息
    通讯作者:

    冯春,助理研究员,主要研究方向:岩土力学数值模拟.E-mail:fengchun@imech.ac.cn

  • 中图分类号: O34

PARTICLE-DEM BASED LINKED BAR STRAIN SOFTENING MODEL AND ITS APPLICATION

  • 摘要: 基于颗粒间的有限接触假设,提出了可表述颗粒间力、力矩传递的连接键模型. 为了表征连接键的塑性、损伤及断裂过程,在连接键中引入了考虑应变软化效应的Mohr-Coulomb 准则及最大拉应力准则. 单一连接键的单向拉伸测试及直剪测试表明了上述连接键应变软化模型的计算精度. 研究了颗粒体系的宏观应变能与颗粒平均配位数的对应关系. 通过计算发现,对于二维颗粒体系,当平均配位数为5 时,颗粒体系的宏观应变能与相同参数下连续介质方法(如有限元等) 计算获得的应变能基本一致. 利用上述连接键应变软化模型对岩石的单轴压缩过程进行了模拟,计算结果表明:岩石单轴压缩的应力应变曲线经历了线性上升段、非线性上升段、非线性下降段及缓变段等4 个阶段,并给出了上述4 个阶段与岩石内部损伤破裂状态的内在联系. 计算结果还表明,随着断裂应变的增大,岩石的破裂模式逐渐由拉剪复合型破裂向单一压剪型破裂转化;随着断裂应变的增大,峰值应力及达到峰值应力时的应变均逐渐增大,但峰值时的破裂度及终态时的破裂度将逐渐减小.

     

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出版历程
  • 收稿日期:  2015-07-30
  • 修回日期:  2015-11-27
  • 刊出日期:  2016-01-18

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