岩石静态和准动态加载应变率的界限值研究

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摘要为研究岩石材料静态和准动态加载试验的应变率界限值，以若干硬岩试件在不同应变率加载条件下的试验数据为基础，借助统计学理论与方法，定量分析岩石动态抗压强度与静态抗压强度之比值与应变率的相关性大小，得到硬岩试件的强度参数与应变率之间的规律性关系，进而得到岩石材料静态和准动态加载试验的应变率界限值，即加载应变率＜5×10－4 s－1时为静态试验，此时均保持在1.00附近，近似为常数，岩石强度与应变率无相关性；5×10－4 s－1＜＜102 s－1时为准动态试验，此时与应变率为幂函数关系，岩石强度与应变率表现出较强或显著相关的特性。

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关键词 ：岩石力学, 加载应变率, 界限值, 统计学

Abstract：To study the threshold value of strain rates between static loading and quasi-dynamic loading of rock materials，uniaxial compression tests of several hard-rock samples were conducted with various strain rates. Then，the correlation between the ratio of rock dynamic compressive strength to static compressive strength，?，and strain rate was quantitatively analyzed using statistic theories and methods. The relationships between strength parameters of hard-rock samples and strain rate were obtained. Further，the threshold value of the strain rates of rock materials under static and quasi-dynamic loading tests were found. The results show that：(1) When the strain rate ＜5×10－4 s－1，the tests are static with around 1.00. It means that rock strength is independent of strain rates. (2) When 5×10－4 s－1＜＜102 s－1，the tests are quasi-dynamic with a power relationship between and strain rates. It indicates that rock strength is significantly dependent of strain rates.

Key words： rock mechanics loading strain rates threshold value statistics

收稿日期: 2011-12-27

引用本文:

梁昌玉1，2，李晓1，李守定1，赫建明1，马超锋3，4. 岩石静态和准动态加载应变率的界限值研究[J]. 岩石力学与工程学报, 2012, 31(6): 1156-1161.
LIANG Changyu1，2，LI Xiao1，LI Shouding1，HE Jianming1，MA Chaofeng3，4. STUDY OF STRAIN RATES THRESHOLD VALUE BETWEEN STATIC LOADING AND QUASI-DYNAMIC LOADING OF ROCK. , 2012, 31(6): 1156-1161.

链接本文:

http://www.rockmech.org/CN/Y2012/V31/I6/1156

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