High-water pressure trapdoor model test device and use method thereof

A use method of a water pressure trapdoor model test device, comprising:

• Step 1, preparing a solid material according to a particle size distribution curve required by a test, and adding a liquid material of a corresponding concentration and comprising corresponding components according to test requirements;
• Step 2, determining a number and moving direction of trapdoors, and ensuring that a trapdoor module is as high as a base plate before the test materials are filled;
• Step 3, arranging first soil pressure sensors in a first cushion block of the base plate, filling the solid material in a test box layer-by-layer, arranging second pressure sensors and pore water pressure gauges in the solid material at a set interval, and arranging third soil pressure sensors in a second cushion block of the trapdoor module;
• Step 4, reading data on the soil pressure sensors and the pore water pressure gauges, recording the data after the data becomes stable, then adding the liquid material into the test box to a specified level, and waiting until read data becomes stable again;
• Step 5, filling a gas into the test box according to a pressure condition required by the test;
• when a reading of a pressure gauge reaches a specified value, waiting for a period of time during which an air compressor is kept in an on-state to the end of the test;
• and Step 6, starting a PIV analysis unit, then starting the trapdoor module, driving the trapdoor module to ascend or descend, recording the development and intensification law soil arching effect within the test box by the PIV analysis unit, and recording data on the soil pressure sensors and the pore water pressure gauges by a data collection system;
• wherein, in Step 3, the second soil pressure sensors and the pore water pressure gauges are arranged on each layer of the solid material at the set interval in a horizontal direction and a vertical direction of the water pressure trapdoor model test device respectively;
• in Step 5, a gas pressure in the test box is servo-controlled by the data conditioning system to ensure that the pressure in the test box is constant.