岩石动态劈裂试验的最优试件尺寸分析

方新宇;许金余;刘 石;陈腾飞;王 鹏

振动与冲击 ›› 2014, Vol. 33 ›› Issue (21) : 73-79.

PDF(2121 KB)
PDF(2121 KB)
振动与冲击 ›› 2014, Vol. 33 ›› Issue (21) : 73-79.
论文

岩石动态劈裂试验的最优试件尺寸分析

  • 方新宇1,许金余1,2,刘 石1,陈腾飞1,王 鹏1
作者信息 +

Analysis on the Optimal Specimen Size of Rock Dynamic Splitting Tests

  • FANG Xin-yu1,XU Jin-yu1,2,LIU Shi1,Chen Teng-fei1, Wang Peng1
Author information +
文章历史 +

摘要

利用有限元分析软件LS-DYNA对常规巴西圆盘、平台巴西圆盘和带孔巴西圆盘这三种最常用的劈拉试件,进行岩石SHPB动态劈裂试验的数值模拟,并依据模拟结果,采用平台巴西圆盘法,对花岗岩试样进行了动态劈裂试验。对比模拟与试验结果,得到了加载应变率与岩石动态抗拉强度的关系,探讨了用于岩石动态劈裂试验的最优试件尺寸。结果表明:平台巴西圆盘法可以较好地满足中心起裂条件,试验结果的可信度更高,而对于本文所采用的岩石参数,建议平台巴西圆盘试件的中心角取20°~24°;如采用带孔巴西圆盘试件进行动态劈裂试验,建议内外孔径比取0.4~0.5;岩石的动态劈拉强度随应变率的增大而增大,但增大速率越来越小,且这种增大趋势受到试件尺寸的显著影响。

Abstract

Three used most commonly specimens:Normal Brazilian disc,flattened Brazilian disc and holed Brazilian disc were simulated by the finite element analysis software LS-DYNA, based on which we adopted flattened Brazilian disc to carry on dynamic splitting tests with granite specimens. By comparing the simulation and test results, we gain the relation of strain rates and tensile strengths of rocks and discuss the optimal specimen size of rock dynamic splitting tests. The results show: Fattened Brazilian disc fits the condition of broking from center well so that the test results will be more credible; For the rock mode used in the paper, we suggest the central angle of flattened Brazil disk to be 20°~24°; If holed Brazilian disc is used in the dynamic splitting tests, the suggested aperture ratio is about 0.4~0.5; Otherwise, the dynamic splitting strengths of rocks are increasing with the increase of strain rate, of which the increase rate decreases while this growing trend is affected by the specimen size observably.


关键词

岩石 / 动态劈裂 / 数值模拟 / 巴西圆盘 / 最优尺寸

Key words

rock / dynamic splitting / numerical simulation / Brazilian discs / Optimal specimen size

引用本文

导出引用
方新宇;许金余;刘 石;陈腾飞;王 鹏. 岩石动态劈裂试验的最优试件尺寸分析[J]. 振动与冲击, 2014, 33(21): 73-79
FANG Xin-yu;XU Jin-yu;LIU Shi;Chen Teng-fei;Wang Peng. Analysis on the Optimal Specimen Size of Rock Dynamic Splitting Tests[J]. Journal of Vibration and Shock, 2014, 33(21): 73-79

PDF(2121 KB)

865

Accesses

0

Citation

Detail

段落导航
相关文章

/