Visual soil freeze-thawing process test apparatus

Abstract

The invention relates to a visual soil freeze-thawing process test apparatus. A temperature control box is connected with an external compressor, a semi-cylindrical sample tank is placed on a temperature control baseboard in the temperature control box, the temperature control baseboard is carved with a groove, the groove is provided with a sealing ring in contact with the semi-cylindrical sample tank, the temperature control baseboard is provided with holes, one of the holes is connected with a Mariotte bottle through a water guiding tube, the other of the holes is connected with a water head adjusting tube, the temperature control baseboard is provided with a filter paper and a soil sample, the top of the soil sample contacts with a temperature control top board, and the temperature control top board is provided with a handle; a displacement sensor is fixed on a bracket, and contacts with the top surface of the temperature control top board; a temperature sensor is inserted into the soil sample through a probe hole on the wall surface of the test tank, and the displacement sensor and the temperature sensor are respectively connected with a data acquisition instrument through a lead; and an adjustable light source is placed at both sides of a camera, the camera is placed at the right side of the semi-cylindrical sample tank, and the camera is connected with an electronic computer through a lead. The apparatus is used for researching the dynamic change process of the freezing rate, the moisture migration rate, the ice crystal speed, the segregated ice thickness and the frost heaving speed with time of soil in the soil freezing process, visually shows the movement of a frozen frontal surface in soil columns and the growth process of frozen fringe, and provides technical guarantee for the freezing and thawing mechanism of the soil.

Description

[0001] technical field [0002] The invention relates to an indoor test device for studying the freeze-thaw process of soil. With this device, it is possible to measure the dynamic changes of soil temperature and moisture migration in each layer over time when the soil freezes under the action of a certain temperature gradient, and to see the process of water flow in the test soil column more intuitively. The movement process of the freezing front and the development process of the freezing edge provide technical support for further elucidating the research on the mechanism of frost heaving and thawing of soil. [0003] Background technique [0004] The freezing and melting process of soil is a common natural phenomenon. When the air temperature drops and the temperature in the surface soil layer or geotechnical structure is lower than the freezing point of soil water, on the one hand, the pore water in the surface soil layer freezes into ice, and the volume expands; on th...

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Problems solved by technology

However, such a research method is based on the assumption that the fractal heaving amount of the soil in each time period is equal to the thickness of the fractal ice layer at that time, and the determination of

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