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Visualization of Chemical Grout Permeation in Transparent Soil

机译：透明土壤中化学灌浆渗透的可视化

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摘要

This paper presents an experiment that visualizes the permeation of chemical grout in transparent soil. The low initial viscosity (5 mPa . s) urea-formaldehyde resin (UFR) was chosen as grouting material in this experiment. The transparent soil used in this study is made of fused silica and a calcium bromide solution with the same refractive index. Triaxial and permeability tests are carried out to demonstrate that the geotechnical properties and hydraulic permeability of this transparent soil are typical of granular soils and suitable for modeling natural sand in permeation problem. A combined grouting and optical measurement system is developed for this study, which consists of an air pressure driven grout injection station to inject grout into a transparent soil model, laser to illuminate the cross-section of interest inside the model, and a charge-coupled device (CCD) camera to capture a series of images during the whole grout injection and permeation process. Image processing techniques including digital image correlation (DIC) are applied to sequence of images to detect the edges of the grout bulb and displacement distribution. The relationship of the grouting radius and grouting time corresponds to Maag's formula on permeation grouting. As a result, the validity of this innovative experiment has been verified.
机译：本文提出了一个可视化化学灌浆在透明土壤中渗透的实验。在该实验中，选择低初始粘度（5 mPa。s）的脲醛树脂（UFR）作为灌浆材料。本研究中使用的透明土壤是由熔融石英和折射率相同的溴化钙溶液制成的。进行了三轴和渗透性测试，以证明这种透明土壤的岩土特性和水力渗透性是粒状土壤的典型特征，适用于模拟渗透问题中的天然砂。为此研究开发了一种组合式灌浆和光学测量系统，该系统包括一个气压驱动灌浆工位，以将灌浆工质注入透明的土壤模型中，激光照射模型中感兴趣的横截面，以及电荷耦合设备（CCD）摄像头可在整个灌浆和渗透过程中捕获一系列图像。将包括数字图像相关性（DIC）的图像处理技术应用于图像序列，以检测灌浆球的边缘和位移分布。灌浆半径与灌浆时间的关系对应于渗透渗流的Maag公式。结果，已经验证了该创新实验的有效性。

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