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The dependence of constitutive properties on temperature and effective normal stress in seismogenic environments

机译：本构性质对地震环境中温度和有效法向应力的依赖性

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摘要

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 displacement D-c almost remains constant below 300degreesC (insensitive to both temperature and effective normal stress sigma(n)(eff)); D-c increases with increasing temperature above 300 degreesC, and the rate of D-c increase with temperature tends to be largest at higher sigma(n)(eff). The breakdown stress drop Deltatau(b) for the granite at constant sigma(n)(eff) is roughly 80 MPa below 300 degreesC, and does not depend on sigma(n)(eff). Above 300 degreesC, Deltatau(b) decreases gradually wit increasing temperature, and the rate of Deltatau(b) reduction with temperature increases at higher sigma(n)(eff). The peak shear strength tau(p) increases nearly linearly with increasing sigma(n)(eff) below 300 degreesC. However, tau(p) becomes lower above 300 degreesC, deviating from the linear relation extrapolated from below 300 degreesC. This is consistent with the onset of crystal plastic deformation mechanisms of Tsukuba granite.
机译：我们通过对地震波场筑波花岗岩样品进行三轴断裂实验，评估了与滑动有关的本构定律的参数如何受到温度和有效法向应力的影响，该实验对应于15 km的深度范围。归一化的临界滑动位移D-c在300°C以下几乎保持恒定（对温度和有效法向应力sigma（n）（eff）都不敏感）; D-c在300摄氏度以上随温度升高而增加，并且D-c随温度升高的速率在sigma（n）（eff）较高时趋于最大。在恒定的sigma（n）（eff）下，花岗岩的击穿应力降Deltatau（b）在300摄氏度以下大约为80 MPa，并且不取决于sigma（n）（eff）。高于300摄氏度，随着温度的升高，Deltatau（b）逐渐降低，而随着温度的升高，Deltatau（b）的降低速率随σ（n）（eff）的增加而增加。低于300摄氏度时，峰值抗剪强度tau（p）随sigma（n）（eff）的增加而线性增加。但是，tau（p）在300摄氏度以上变得更低，这与从300摄氏度以下推断的线性关系有所偏离。这与筑波花岗岩的晶体塑性变形机制的开始是一致的。

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