The Dependence of Constitutive Properties on Temperature and Effective Normal Stress in Seismogenic Environments
The Dependence of Constitutive Properties on Temperature and Effective Normal Stress in Seismogenic Environments
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DOI：
10.1007/s00024-004-2538-x
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发表时间：
2004-08
影响因子：
2
通讯作者：
A. Kato;S. Yoshida;M. Ohnaka;H. Mochizuki
中科院分区：
文献类型：
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作者：
A. Kato;S. Yoshida;M. Ohnaka;H. Mochizuki
- 我们已经评估了如何的参数规定的滑移相关的本构关系的温度和有效正应力的影响，进行三轴断裂实验Tsukuba花岗岩样品在孕震环境中，这对应于深度范围为15公里。标准化临界滑移位移Dcalmost在300 ° C以下保持恒定（对温度和有效正应力σneff不敏感）; Dc在300 °C以上随温度升高而增加，且Dc随温度增加的速率在σneff较高时趋于最大。当σ neff为常数时，花岗岩的破裂应力降Δτ b在300 °C以下约为80 MPa，与σneff无关。在300 °C以上，Δτ b随温度的升高而逐渐减小，在较高的σneff下，Δτ b随温度的减小速率增大。在300 °C以下，峰值剪切强度τ p随σ neff的增加而近似线性增加。然而，τ p在300 °C以上变得更低，偏离了从300 °C以下外推的线性关系。这与筑波花岗岩的晶体塑性变形机制的开始是一致的。
— We have evaluated how the parameters prescribing the slip-dependent constitutive law are affected by temperature and effective normal stress, by conducting the triaxial fracture experiments on Tsukuba-granite samples in seismogenic environments, which correspond to a depth range to 15 km. The normalized critical slip displacementDcalmost remains constant below 300oC (insensitive to both temperature and effective normal stress σneff);Dcincreases with increasing temperature above 300 °C, and the rate ofDcincrease with temperature tends to be largest at higher σneff. The breakdown stress drop Δτbfor the granite at constant σneffis roughly 80 MPa below 300 °C, and does not depend on σneff. Above 300 °C, Δτbdecreases gradually with increasing temperature, and the rate of Δτbreduction with temperature increases at higher σneff. The peak shear strength τpincreases nearly linearly with increasing σneffbelow 300 °C. However, τpbecomes lower above 300 °C, deviating from the linear relation extrapolated from below 300 °C. This is consistent with the onset of crystal plastic deformation mechanisms of Tsukuba granite.