Development of an experimental system for analyzing the rheology of dense granular materials and fault gouge under seismic conditions

0732715资源该基金支持一项为期两年的合作项目，以开发一种旋转剪切装置，用于研究地震条件下致密颗粒材料和断层泥的流变学。 为了同时使材料经受大滑移、流体约束、升高的孔隙压力、高滑移速度和高法向应力，该装置将联合收割机与PI开发的密封环形单元和伺服控制的液压系统组合在一起，所述密封环形单元将包含粒状材料并允许在原位地震条件下进行加载，所述伺服控制的液压系统能够连续地，滑移速度单调变化。 仪器的组件将在俄克拉荷马州大学组装，但最终仪器将在加利福尼亚州门洛帕克的美国地质勘探局存放和维护。 如果成功的话，该设备预计将产生新的实验数据，可能会导致我们对地震破裂力学的理解的进步。

0732715RechesThis grant supports a two year collaborative effort to develop a rotary shear device for studying the rheology of dense granular materials and fault gouge under earthquake conditions. In order to simultaneously subject materials to large slip, fluid confinement, elevated pore pressure, high slip velocity, and high normal stress, the device will combine a commercially available loading and monitoring device together with a PI developed sealed annular cell that will contain the granular material and allow loading under in situ seismic conditions and a servo-controlled hydraulic system that is capable of continuous, monotonous change of slip velocity. Components of the instrument will be assembled at the University of Oklahoma though the final instrument will be housed and maintained at the USGS in Menlo Park, CA. If successful, the device is anticipated to produce novel experimental data that may lead to advances in our understanding of earthquake rupture mechanics.***