袁璞,马芹永,马冬冬

• 1:安徽理工大学矿山地下工程教育部工程研究中心
• 2:安徽理工大学土木建筑学院

摘要(Abstract)：

为探讨岩石试件加工端面不平行对岩石材料动力学特性测试结果的影响,采用有限元分析软件LS-DYNA对13种端面不平行度的岩石试件开展SHPB数值模拟,并分析了端面不平行对加载过程应力均匀性的影响。结果表明:随端面不平行度γ的增加,岩石试件动态应力-应变曲线逐渐向右和向下移动,且峰前加载段逐渐延长。当γ>1.60%时,动态应力-应变曲线在加载初期出现一个微小的加载-卸载过程,且在升时为120μs的半正弦入射波加载阶段岩石试件达不到应力均匀状态。基于数值模拟结果,建立了端面不平行度与量纲一化的动态单轴抗压强度、平均应变率和峰值应变的定量表达式。

关键词(KeyWords)： 岩石;SHPB;端面不平行;数值模拟;应力均匀性

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(51774011,深部岩巷爆破震动作用机理与围岩动力响应特性研究);; 安徽省高校自然科学研究重点项目(KJ2017A097,水-动力耦合作用下高地温深部砂岩劣化宏细观损伤机理研究);; 安徽省住房城乡建设科学技术计划项目(2017YF-08,干湿循环作用下煤矿深部砂岩动力学特性劣化试验研究);; 安徽理工大学青年教师科学研究基金资助项目(QN201607,高地温干湿循环作用下深部砂岩动力学特性研究)

作者(Author): 袁璞,马芹永,马冬冬

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