Temperature-controllable large-size geotechnique true triaxial multi-field coupling test system and test method

A temperature-controllable large-size geotechnical true triaxial multi-field coupling test system, comprising:

• a host loading mechanism;
• a deformable large-size soil box;
• an independent three-dimensional loading unit;
• a refrigeration, water and salt supplementation unit;
• and
• a soil-water-ice-salt change monitoring unit, wherein the deformable large-size soil box is arranged on the host loading mechanism;
• wherein the independent three-dimensional loading unit, the refrigeration, water and salt supplementation unit, and the soil-water-ice-salt change monitoring unit are all connected with the deformable large-size soil box to respectively correspondingly apply stress to the soil box, supplement refrigeration as well as water and salt, and monitor soil-water-ice-salt changes;
• wherein the host loading mechanism comprises a carrier base, a vertical loading framework, and a horizontal loading framework;
• the carrier base comprises a carrier table located below the vertical loading framework and a rail seat extending in a horizontal direction of the carrier table;
• the horizontal loading framework comprises a workbench, a lateral reaction frame, and a moving lifting wheel disposed below the workbench;
• the lateral reaction frame is disposed on the workbench through a lateral pressure vertical column;
• and the deformable large-size soil box is disposed on the workbench and is surrounded by the lateral reaction frame;
• wherein the deformable large-size soil box comprises a bottom plate, soil box side plates, a soil box horizontal deformation limiting device and a normal loading plate;
• a water supply and drainage trough is arranged on the upper surface of the bottom plate;
• a water permeation plate is arranged on the water supply and drainage trough;
• a lateral sliding device is also arranged on the outer side of the soil box side plates;
• a lateral oil cylinder is fixedly provided on the lateral reaction frame;
• the lateral oil cylinder passes through the lateral reaction frame and is connected with the lateral sliding device;
• and the lateral oil cylinder slides along the lateral sliding device in the deformation process of the deformable large-size soil box.