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

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 acq