Dry granular flows provide an ongoing challenge to physics and under saturation the multiphase physics is even more difficult to disentangle. A rich literature has elucidated the possible regimes achieved, however, the nonlinear nature of the multiphase process makes predicting the appropriate dynamic regime difficult. In this study, we introduce a new experimental strategy to identify the appropriate dynamical regimes by combining traditional methods with acoustic emission measurements. We sheared natural granular materials under dry, water and oil-saturated conditions while recording mechanical, acoustic and visual data. By applying alternate low and high velocity steps we respectively obtained quasi-static and inertial granular flow regimes. Dilation was observed for all high-velocity flows but its amount varied as did the degree of acoustic emission. At high velocities, the water-saturated flow dilated less and had reduced acoustic emissions relative to the dry case. In contrast, the oil-saturated flow dilated more while having even less acoustic emissions. This difference in trends of the dilation and acoustic emissions with increasing fluid viscosity suggests that oil and water granular flows achieved distinct dynamical regimes. Damping of granular pressure by reducing grain collisions and Dilatancy due to fully lubricated contacts are two competing processes influence the saturated shear physics and theoretically expected, but distinguishing between the regimes is difficult to anticipate. The acoustic emissions provide an extra piece of information that allows us to distinguish the physical regimes and determine the competition between processes that control the physics of saturated granular flows in the granular inertial regime.

干颗粒流对物理提出了挑战，在饱和状态下，多相物理更难以解开。丰富的文献阐明了可能实现的状态，但是，多相过程的非线性特性使预测合适的动态状态变得困难。在这项研究中，我们介绍了一种新的实验策略，通过将传统方法与声发射测量相结合来确定适当的动力状态。我们在干燥，水和油饱和的条件下剪切天然颗粒材料，同时记录机械，声学和视觉数据。通过应用交替的低速和高速步长，我们分别获得了准静态和惯性颗粒流态。在所有高速流中都观察到膨胀，但是它的数量随声发射程度的变化而变化。相对于干燥情况，在高速度下，水饱和流的扩散较小，并且声发射降低。相反，油饱和的流动更多地扩张，而声发射更少。随着流体粘度的增加，膨胀和声发射趋势的这种差异表明，油和水颗粒流实现了截然不同的动力学机制。通过减少颗粒碰撞和完全润滑接触引起的膨胀率来降低颗粒压力，这是两个相互竞争的过程，它们影响饱和剪切物理学，这在理论上是可以预期的，但是很难区分两种状态。