Physical modeling of fluid-filled fractures using the dynamic photoelasticity technique
Physical modeling of fluid-filled fractures using the dynamic photoelasticity technique
复制标题
使用动态光弹性技术对充液裂缝进行物理建模
DOI：
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
R. Askari
中科院分区：
文献类型：
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作者：
Haitao Cao;E. Médici;R. Askari
我们开发了一种基于动态光弹性技术的光学装置，用于可视化和分析模拟流体填充裂缝内克劳克利斯波的传播。尽管动态光弹性已被其他人用来研究地震波传播，但本研究增加了针对色散特性的定量分析。我们使用透明的光弹性敏感聚碳酸酯和不敏感的丙烯酸板对充满液体的裂缝进行物理建模。然后我们使用基于像素的框架来分析裂缝中激发的克劳克利斯波的色散。通过这种基于像素的框架，我们证明动态光弹性技术可以定量描述地震波传播，其质量与使用传统传感器（接收器）的实验类似，同时还可以可视化地震应力场。我们观察到流体粘度的增加导致克劳克利斯波的速度降低。我们还通过对锯齿状裂缝进行建模来确定该方法在复杂几何形状的情况下分析地震数据的能力。裂缝的几何形状可以强烈影响克劳克莱斯波的特征，因为我们注意到锯齿情况下克劳克莱斯波速度更高，并且应力场的扰动更大。
We have developed an optical apparatus based on the dynamic photoelasticity technique to visualize and analyze the propagation of the Krauklis wave within an analog fluid-filled fracture. Although dynamic photoelasticity has been used by others to study seismic wave propagation, this study adds a quantitative analysis addressing dispersion properties. We physically modeled a fluid-filled fracture using transparent photoelastic-sensitive polycarbonate and nonsensitive acrylic plates. Then we used a pixel-based framework to analyze the dispersion of a Krauklis wave excited in the fracture. Through this pixel-based framework, we thus demonstrate that the dynamic photoelasticity technique can quantitatively describe seismic wave propagation with a quality similar to experiments using conventional transducers (receivers) while additionally visualizing the seismic stress field. We observe that an increase in the fluid viscosity results in a decrease in the velocity of the Krauklis wave. We also determine the capability of the method to analyze seismic data in the case of complex geometry by modeling a sawtooth fracture. The fracture’s geometry can strongly affect the characteristics of the Krauklis wave as we note a higher Krauklis wave velocity for the sawtooth case, as well as greater perturbation of the stress field.