Loading Rate Dependency of Young's Modulus of Rock.
Loading Rate Dependency of Young's Modulus of Rock.
复制标题
岩石杨氏模量的加载速率依赖性。
DOI：
10.2473/shigentosozai.117.29
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
Xu Jiang
中科院分区：
文献类型：
--
作者：
S. Okubo;K. Fukui;Xu Jiang
众所周知，岩石的单轴抗压强度随加载速率的增加而增加。杨氏模量的加载速率依赖关系也有许多作者进行了研究，但只阐明了一小部分。在本研究中，为了减少数据的散点，对测试方法进行了轻微的修改。试验中将峰值强度50%时的杨氏模量归一化为峰值强度10%时的杨氏模量，这是在预定加载速率下初步得到的。结果表明，该检测方法是有效的，具有良好的应用前景。研究人员检查了七块日本岩石。研究发现，安山岩、砂岩和凝灰岩均表现出杨氏模量对加载速率的依赖性。例如，在Sanjome安山岩中，加载速率每增加10倍，杨氏模量增加2%。大理岩、花岗岩和砂岩的杨氏模量随加载速率的增加而略有下降。借助本构方程，讨论了模量的时间依赖性。结果表明，加载速率高时，不可恢复应变延迟扩展。这可能是杨氏模量随加载速率增加而增加的主要原因。
It is well known that uniaxial compressive strength of rock increases with loading rate. Loading rate dependency of Young's modulus has been also studied by many authors, however, only a small part are clarified. In this study, testing method are slightly modified to reduce scatter of data. In the testing, Young's modulus at 50% of the peak strength is normalized by that at 10% of the peak strength which is preliminarily obtained under a predetermined loading rate. It was found that this testing method is effective and promising. Seven Japanese rocks were examined. It was found that an andesite, a sandstone and two tuffs exhibited loading rate dependency of Young's modulus. For example, in case of Sanjome andesite, Young's modulus increased 2 % at every ten fold increase of loading rate. On the other hand, Young's moduli of a marble, a granite and a sandstone very slightly decreased with increase of loading rate. With aid of constitutive equations, time dependency of modulus was discussed. It was found that irrecoverable strain delayed to extend when loading rate was high. That is possibly the main reason of increase of Young's modulus with increase of loading rate.