由应变局部化分析确定Aigion断层的应力方向
Stress orientation evaluated from strain localisation analysis in Aigion fault
摘要：
在以科林斯湾西南部为中心的“CRL”（科林斯裂谷实验室项目）（Cornet等人，2004 a）框架内（www.corinth-rift-lab.org），从708 m至782 m深度连续收集了活动Aigion断层的断层带岩心。在粘土质岩芯内部，在与岩芯轴线成68度角的平面上可以看到带有明显滑移线的清晰剪切面。该破坏面不是由减压过程引起的，而是一个滑移面，因为在界面处观察到了清晰的条纹。基于对粘土质断层泥三轴试验标定的弹塑性本构模型，研究表明粘土质岩心内部可能形成剪切带。剪切带的方向的解决方案相比，现有的滑动面内的粘土断层泥的方向，这个结果是用来推断的主应力的方向。结果表明，在弱断裂带中，主应力的方向局部几乎平行于和垂直于断层轴。
英文摘要：
Within the frame of the 'CRL' (Corinth Rift Laboratory project) (Cornet et al, 2004a) centered on the south western sector of the Gulf of Corinth (http://www.corinth-rift-lab.org), fault zone cores from the active Aigion fault have been collected continuously from depths between 708 m to 782 m. Inside this clayey core, a clear shearing surface with marked slip lines is visible on a plane that makes a 68 degree angle with respect to the core axis. This failure surface was not induced by the decompression process but is indeed a slip plane as clear striation is observed at the interface. On the basis of an elastoplastic constitutive model calibrated on triaxial tests on the clayey gouge, it is shown that shear band formation inside the clayey core is possible. The solution for the orientation of the shear band is compared to the orientation of an existing slip surface inside the clayey gouge and this result is used to deduce the orientation of the principal stresses. It is shown that as commonly observed in weak fault zones, the orientation of the principal stresses is locally almost parallel and perpendicular to the fault axis.
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