Large-scale soil water-heat-force-salt four-field coupling effect test system and method

Abstract

The invention discloses a large-scale soil water-heat-force-salt four-field coupling effect test system and a method and relates to the research field of soil engineering soil body indoor freezing andthawing test. The system comprises a loading frame, a loading system, a water replenishing system, a temperature control system, a data acquisition and control system and a forming system, the loading system applies the axial load and the confining pressure to the soil body, the water replenishing system can simulate the supply of the soil body by different salt content and water head, the temperature control system realizes the constant temperature water supply for the freezing and thawing circulation and the water replenishing system of the soil body, the data acquisition and control systemmonitors the temperature and distribution of water and salt, pressure, the pore water pressure, the vertical and the transverse deformation of soil, the gas pressure of the gas pressure chamber in real time, controls data acquisition and imaging processing, and the forming system is used for compacting the designed soil material and shaping the soil body used for the test. The indoor soil body freezing and thawing process test of water-heat-force-salt four-field coupling effect is realized for the study of the freezing and thawing test of the soil.

Description

technical field [0001] The invention relates to the field of indoor freeze-thaw test research of geotechnical soil, and more specifically relates to a large-scale soil water-heat-force-salt four-field coupling test system and method. Background technique [0002] Seasonal frozen soil is the soil layer that freezes in winter and melts in summer. In my country, seasonal frozen soil is mainly distributed in the area west of Helan Mountain-Ailao Mountain, and in the east of this line, and in the area north of Qinling Mountains-Huaihe River, accounting for about 53% of the country's land area. %, at the same time, in the range of seasonally frozen soil, there are large areas of saline soil; the meteorological environment of periodic temperature changes in seasonally frozen saline soil areas leads to severe frost heaving and thawing of soil in this type of area. Many diseases such as sinking, salt swelling, and mud turning seriously threaten the safety and stability of foundations a...

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Problems solved by technology

[0003] At present, the experimental research on the four-field coupling effect of water-heat-mechanical-salt on soil is mainly focused on on-site monitoring and indoor experiments. The on-site observation period is too long, the cost is high, and the environmental conditions are difficult to control. The monitoring results are difficult to use for data accuracy. Highly demanding scientific research, and the reported indoor experiments on the four-field coupling of soil water-heat-mechanical-salt have the following deficiencies: most of the test soils are small-scale soils (the length, width and height are mostly less than 50 cm) ; Use cylindrical rigid barrels or square boxes to fill soil materials, so the lateral displacement of the soil cannot be monitored, and lateral confining pressure cannot be applied; insulation materials are used for insulation, although the insulation materials have certain insulation functions, the insulation materials are still Thermally conductive materials, resulting in the temperature loss of the test system cannot be effectively controlled

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