Time, Temperature, and Saturation Dependence In Elasticity: The Search for Mechanism

岩石和其他固结材料的弹性行为（例如，混凝土）是非线性的、滞后的，并且显示对应力和温度扰动的log（t）恢复。导致这些异常行为的物理机制尚不清楚。然而，众所周知，岩石的主要弹性性质是由颗粒之间的键合性质决定的，而不是颗粒本身。岩石中的键合系统对温度、孔隙流体结构和应力的变化非常敏感。该项目的目标是开发一个实验系统，该系统将允许在明确定义的温度和饱和状态下对岩石样品的弹性张量进行稳态和瞬态测量。将用于确定样品的弹性张量的技术是共振超声光谱（罗斯）。罗斯最近已被证明是一种有效和灵敏的岩石样品测量技术。因此，罗斯将被用来仔细探索岩石弹性行为的时间、温度和饱和度依赖性。这些数据将促进我们对驱动岩石和其他固结材料（如混凝土）中粘结系统行为的微观机制的理解。

McCall EAR-0087739 The elastic behavior of rock and other consolidated materials (e.g., concrete) is nonlinear, hysteretic, and displays log ( t ) recovery to stress and temperature perturbations. The physical mechanisms causing these unusual behaviors is not understood. It is known, however, that the primary elastic properties of a rock are a consequence of the nature of the bonds between grains, rather than of the grains themselves. The bond system within a rock is highly sensitive to changes in temperature, pore fluid configurations, and stress. The goal of this project is to develop an experimental system that will allow steady state and transient measurement of the elastic tensor of a rock sample in well-defined temperature and saturation states. The technique that will be used to determine the elastic tensor of the sample is resonant ultrasound spectroscopy (RUS). RUS has recently been shown to be an efficient and sensitive measurement technique for rock samples. Thus RUS will be used to make a careful exploration of the time, temperature, and saturation dependence of elastic behavior in rock. These data will fuel our understanding of the microscopic mechanisms driving the behavior of the bond system in rock and other consolidated materials, such as concrete.