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通过一维开放系统的不同温度梯度人工冻土连续冻结试验,采用动态图像采集和数字分析技术,实现了在冻结过程中获取的分凝冰生长信息在空间和时间分布上的一致性。根据试验中获得的即时图像信息,经过二值化处理后,可以定量的确定分凝冰形成的时间、位置、厚度及发展规律等主要信息。结果表明,图像分析获得的分凝冰厚度与位移计测得的冻胀量基本吻合,分凝冰演化过程可以划分为3个主要阶段:初始阶段几乎不产生分凝冰;第二阶段冻结锋面推进速度减缓,分凝冰以不连续薄冰层形式少量出现;第三阶段冻结锋面趋于稳定,分凝冰的产生主要为末透镜体的生长。在连续冻结试验中,温度梯度与末透镜体的形成时间近似成线性关系,温度梯度越大,出现末透镜体的时间越早。
Through the one-dimensional open system of different temperature gradient artificial frozen soil continuous freezing test, the use of dynamic image acquisition and digital analysis technology to achieve the freezing and condensate ice growth information obtained in the spatial and temporal distribution of the consistency. According to the real-time image information obtained in the experiment, after binarization processing, the main information such as the time, location, thickness and development rule of the formation and distribution of ice can be quantitatively determined. The results show that the thickness of the condensate ice obtained by the image analysis basically agrees with the frost heaving measured by the displacement meter. The evolution of the segmented ice can be divided into three main phases: the segmented ice hardly occurs in the initial stage; the frost front in the second stage In the third stage, the frost front tended to be stable, and the formation of sub-freezing ice was mainly the growth of the end lens. In the continuous freezing experiment, the temperature gradient is approximately linear with the formation time of the lens body. The larger the temperature gradient, the earlier the appearance of the lens body.