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Application of electrical resistivity method in the characterization of 2D desiccation cracking process of clayey soil

机译：电阻率法在粘土土壤2D干燥开裂过程中的应用

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摘要

Electrical resistivity method (ERM) is an attractive approach in the assessment of soil physical properties (water content, void ratio, density, etc.), which are closely related to electrical resistivity distribution. ERM performance in the detecting and mapping of cracks initiation, propagation, and coalescence processes in the 2D/3D scale needs to be studied to provide the technical support for its field application. An evaporation test of a clayey soil specimen with an integrated experimental configuration is performed to analyze the performance of ERM in the characterization of the 2D desiccation cracking process. The evolutions of ambient temperature, relative humidity, average water content, crack morphology, and apparent electrical resistivity of the studied sample are well captured during continuous drying. Image processing allows the quantitative geometrical description of the crack pattern formation. The consistency between the start-to-increase point of measured electrical resistivity, electrical resistivity anomalies, and the cracks propagations presents the good performance of ERM in crack characterization and reveals its potential to map the cracks before possible visualization. A better understanding of the fundamental mechanisms of desiccation cracking is also obtained based on the experiment results. This study provides an insight to apply ERM for engineering purposes involving crack monitoring and early crack detection.
机译：电阻率法（ERM）是一种有吸引力的方法，可评估土壤物理性质（水含量，空隙比，密度等），其与电阻率分布密切相关。 ERM在2D / 3D规模中的裂缝启动，传播和聚结过程中检测和映射的性能需要研究，以提供其现场应用的技术支持。进行具有综合实验配置的CLAYEY土壤样品的蒸发试验，分析ERM的表征在2D干燥裂化过程的表征中。在连续干燥期间，环境温度，相对湿度，平均水含量，裂纹形态和表观电阻率的演变，很好地捕获。图像处理允许对裂纹图案形成的定量几何描述。测量电阻率，电阻率异常和裂缝传播的开始增加点之间的一致性呈现ERM在裂纹表征中的良好性能，并揭示其在可能的可视化之前映射裂缝的潜力。还基于实验结果获得了对干燥裂缝的基本机制的更好理解。本研究提供了应用ERM的洞察力，以实现涉及裂纹监测和早期裂纹检测的工程目的。

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