Visco-Elastic Behavior of Fractured Rock

裂隙岩石的粘弹性行为

• 批准号: 03452238
• 负责人: OKUBO Seisuke
• 金额: $ 4.35万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-03452238/
• 关键词: Rock; Visco-elasticity; Constitutive Equation; Time Dependence; Creep; Relaxation; Moisture; 岩磐; き裂; レオロジ-; 破壊

At first, a very simple constitutive equation of variable compliance type is discussed, which can be applicable to a fractured rock. The constitutive equation can be solved analytically for several loading conditions such as creep, relaxation, constant strain rate, constant stress rate and allows to examine the relations of time dependent behavior among these loading conditions.Also in this study, six rocks were tested in uniaxial compression up to the post-failure region. With increase of loading rate, it was found for all samples that the strength increases and stress-strain curve in the post-failure region shifts to the right-hand side. The slope of the stress-strain curve, however, does not change meaningfully with loading rate. It should be noted that the increase of strength with 10 fold increase of loading rate has a certain value which does not depend on moisture content.The constitutive equation was used to simulate the loading rate dependency under uniaxial compression tests. It was found that the calculated results give a good approximation to the experimental results for all sample rocks.

首先讨论了一个适用于裂隙岩体的变柔度型本构方程。该本构方程可以在蠕变、松弛、恒定应变率、恒定应力率等多种加载条件下解析求解，并可以检查这些加载条件之间的时间相关行为关系。此外，在本研究中，对六种岩石进行了单轴压缩试验直至破坏后区域。随着加载速率的增加，所有试件的强度均有所提高，破坏后应力-应变曲线均右移。然而，应力-应变曲线的斜率不随加载速率而有意义地改变。值得注意的是，当加载速率增加10倍时，强度的增加有一定的值，且与含水率无关。结果表明，对于所有岩石样品，计算结果与实验结果都有很好的近似性。

项目成果

大久保 誠介: "コンプライアンス可変型構成方程式の解析的検討" 資源・素材学会誌. 108. 601-606 (1992)

大久保清介：“可变顺应型本构方程的分析研究”日本资源材料学会杂志108。601-606（1992）。

Seisuke Okubo: "Visco-Elastic Behavior of Fractured rock" J.MMIJ. Vol.108. 601-606 (1992)

Seisuke Okubo：“断裂岩石的粘弹性行为”J.MMIJ。