Model test device for simulating environmental load and scouring effect on suction caisson

A model test device for simulating environmental load and scouring effect on a suction caisson, comprising:

• a laminar shear box, wherein a suction caisson model is disposed inside the laminar shear box, the suction caisson model comprises the suction caisson being cylindrical in shape and connected to a vacuum system, a lower part of the suction caisson is provided with saturated clay, and an upper part of the saturated clay is provided with a water body;
• a top of the laminar shear box is provided with a penetration mechanism, and the suction caisson is connected to the penetration mechanism through a connecting rod;
• wherein a plurality of groups of scouring pit simulation mechanisms are arranged around the suction caisson inside the laminar shear box, and each of the plurality of groups of scouring pit simulation mechanisms comprises a bracket disposed in the laminar shear box, the bracket is provided with a telescopic arm connected to a cutting plate, and the cutting plate is curved fan-shaped;
• when all the cutting plates move to positions where the cutting plates are in contact with an outer wall of the suction caisson, the cutting plates are mutually connected to form a ring surrounding the suction caisson, an inner edge of the ring forms a complete circle attached to the outer wall of the suction caisson, an outer edge of the ring is higher than the inner edge of the ring, and the outer edge is located above the saturated clay in the water body.