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Monitoring the freeze-thaw process of soil with different moisture contents using piezoceramic transducers

机译：使用压电陶瓷传感器监测不同水分含量的土壤的冻融过程

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摘要

Water content plays an active and important role in the performance of the soil freeze-thaw cycle to form frozen soil mechanical properties. Monitoring the freeze-thaw cycle of soil with various types of soil with varied moisture content will provide a direct observation of the properties of soil in cold regions. This paper presents new findings from monitoring the freeze-thaw process of soil using a piezoceramic-based smart aggregate (SA). For comparison, clay soil and medium sand with different moisture contents were used to study the behavior of the soil under the freeze-thaw process. Two SAs were embedded in the soil specimens with a pre-determined distance between them, one as an actuator to generate a stress wave and the other as a sensor to detect the propagated wave. As the propagation of the emitted wave is sensitive to soil status and properties, it is possible to monitor the soil freeze-thaw process by interpreting the SA sensor signal. Based on the attenuation of the energy, a freeze-thaw status indicator was established to describe the freezing-thawing condition. Indicator values of soil specimens with different types and different levels of moisture in freeze-thaw cycles were studied. The test results indicate that the freezing duration in the freezing-thawing process varied for different types of soil and different initial moisture content of the soil. Soil with different particle sizes and moisture content will determine the frozen soil microstructure and its corresponding mechanical properties. Our results illustrate that if soil particle size is bigger, then the signal indicator is stronger; if the moisture content is higher for the same soil, then the signal indicator is stronger. The research presents an innovative method to investigate the freezing-thawing performance of soil and potentially points to a new method to study the variation of soil mechanical properties during the freezing-thawing process, which is a critical problem for infrastructure in cold regions.
机译：水分在土壤冻融循环过程中发挥积极而重要的作用，以形成冻土的机械性能。监测具有不同水分含量的各种土壤的冻融循环将直接观察寒冷地区的土壤特性。本文介绍了使用基于压电陶瓷的智能骨料（SA）监测土壤的冻融过程的新发现。为了进行比较，使用了不同水分含量的粘土和中砂来研究冻融过程中的土壤特性。将两个SA嵌入到土壤标本中，它们之间具有预定的距离，一个SA作为产生应力波的致动器，另一个作为检测传播波的传感器。由于发射波的传播对土壤状况和特性敏感，因此可以通过解释SA传感器信号来监视土壤冻融过程。基于能量的衰减，建立了冻融状态指示器来描述冻融状况。研究了冻融循环中不同类型，不同含水量的土壤标本的指标值。试验结果表明，不同类型的土壤和土壤初始含水量不同，冻融过程中的冻融时间也不同。具有不同粒径和水分含量的土壤将决定冷冻土壤的微观结构及其相应的机械性能。我们的结果表明，如果土壤颗粒尺寸较大，则信号指示剂会更强;如果相同土壤的水分含量较高，则信号指示器较强。该研究提出了一种创新的方法来研究土壤的冻融性能，并潜在地提出了一种研究冻融过程中土壤力学性能变化的新方法，这是寒冷地区基础设施的关键问题。

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