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金属矿山 ›› 2016, Vol. 45 ›› Issue (02): 7-12.

• 采矿工程 • 上一篇    下一篇

单裂隙岩石动态强度破坏准则的数值模拟

王浩宇1,许金余1,2,刘石1,方新宇1   

  1. 1.空军工程大学机场建筑工程系,陕西 西安 710038;2.西北工业大学力学与土木建筑学院,陕西 西安 710072
  • 出版日期:2016-02-15 发布日期:2016-03-11
  • 基金资助:

    * 国家自然科学基金项目(编号:51378497)。

Research on the Dynamic Strength Criteria of Rock with a Single Fissure Based on Numerical Simulation

Wang Haoyu1,Xu Jinyu1,2,Liu Shi1,Fang Xinyu1   

  1. 1.Department of Airfield and Building Engineering,Air Force Engineering University,Xi′an 710038,China;2.College of Mechanics and Civil Architecture,Northwest Polytechnic University,Xi′an 710072,China
  • Online:2016-02-15 Published:2016-03-11

摘要: 运用ANSYS/LS-DYNA动力有限元软件,对不同弹速冲击下单裂隙岩石的SHPB动态破坏进行了数值仿真模拟,通过对模拟数据的回归分析确定强度准则数学表达式中的待定系数,并探讨了加载平均应变率与待定系数的关系。结果表明:岩石力学中常用的几种强度准则,包括Mohr-Coulumb准则、Hoek-Brown准则、Griffith准则等并不适用于单裂隙岩石的冲击破坏,而Fairhurst准则具有较好的适用性;随着加载平均应变率的增大,Fairhurst准则中的2个待定系数均近似线性增长,据此构建了适用于单裂隙岩石的动态Fairhurst强度准则。基于计算机仿真模拟对单裂隙岩石的动态强度准则进行拟合分析的方法,为下一步更便捷、高效地得到岩石材料的强度破坏准则提供了新思路。

关键词: ANSYS/LS-DYNA, 单裂隙, 岩石, 霍普金森压杆, 动态强度准则

Abstract: The dynamic finite element software ANSYS/LS-DYNA was used to simulate the SHPB dynamic tests during various projectile velocities on rock specimens with a single fissure.Those undetermined coefficients in the mathematical expressions of rock strength criteria was gained by the regression analysis of simulation data while the relation between average strain rate and undetermined coefficients was studied as well.The results show:Several commonly used strength criteria in rock mechanics,including Mohr-Coulumb criterion,Hoek-Brown criterion,Griffith criterion,are not suitable for the rock specimens with a single fissure while Fairhurst criterion is the only one which fits well for the condition in the paper.With the average strain rate increase,two undetermined coefficient among Fairhurst criterion raised according to the linear relation.Based on this,the dynamic Fairhurst criterion for rocks with a single fissure is built.At last,the fitting analysis of the dynamic rock strength criteria through the computer simulation of dynamic splitting tensile tests has provided a new thought for more conveniently and efficiently grasping the rock failure criterion.

Key words: ANSYS/LS-DYNA, Single fissure, Rock, SHPB, Dynamic strength criteria