Photoporomechanics: An Experimental Method to Visualize the Effective Stress Field in Fluid-Filled Granular Media
Photoporomechanics: An Experimental Method to Visualize the Effective Stress Field in Fluid-Filled Granular Media
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DOI：
10.1103/physrevapplied.16.024043
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发表时间：
2021-08
影响因子：
4.6
通讯作者：
Wei Li;Yue Meng;B. Primkulov;R. Juanes
中科院分区：
文献类型：
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作者：
Wei Li;Yue Meng;B. Primkulov;R. Juanes
有效应力决定了多孔介质的力学行为。在这项研究中，我们使用光弹性可视化的过程中，耦合流体流动和机械变形的充液颗粒介质中的有效应力场的演变。我们把这种实验方法称为摩擦力学。我们开发了一种制造工艺，以生产毫米级的无残余应力的光弹性球具有高的几何精度。我们使用颜色来量化作用在粒子上的力，范围很广，而使用光强度来表示小范围的力。然后，我们提供了一个应用程序的渗流力学来说明一维固结过程中的有效应力的演变：一个过程，通过该过程，由突然的负载引起的应力逐渐通过流体填充的颗粒填料作为流体排水和多余的孔隙压力消散。我们的技术提供了一个强大的实验模型系统来研究颗粒介质中固流耦合过程的颗粒尺度支撑。
Effective stress governs the mechanical behavior of porous media. In this study, we use photoelasticimetry to visualize the evolving effective stress field in fluid-filled granular media in processes that couple fluid flow and mechanical deformation. We refer to this experimental method asphotoporomechanics. We develop a fabrication process to produce millimeter-scale residual-stress-free photoelastic spheres with high geometric accuracy. We use color to quantify the forces acting on the particles over a wide range of forces, while using light intensity for a small range of forces. We then provide an application of photoporomechanics to illustrate the evolution of effective stress during one-dimensional consolidation: a process by which the stresses caused by a sudden load are gradually transmitted through a fluid-filled granular pack as the fluid drains and excess pore pressures dissipate. Our technique provides a powerful experimental model system to study the grain-scale underpinning of coupled solid-fluid processes in granular media.