Hypergravity model test device and method for simulating progressive failure of shield tunnel face

A hypergravity model test device for simulating a progressive failure of a shield tunnel face, comprising:

• a model box;
• a shield tunnel model;
• a servo loading control system;
• and
• a data acquisition system;
• wherein the shield tunnel model is arranged inside the model box;
• the servo loading control system is arranged outside the model box;
• the data acquisition system is distributed inside and outside the model box;
• the model box comprises a rigid box body, a sealing plate and a camera mounting frame;
• the shield tunnel model comprises a shield shell, a rigid plate and a support block;
• the servo loading control system comprises a servo motor, a planetary roller screw electric cylinder, a loading rod and a base;
• and the data acquisition system comprises a linear variable differential transformer (LVDT) displacement transducer, an axial force meter, a pore pressure transducer, an earth pressure transducer and an industrial camera;
• and
• the shield shell is a semi-cylindrical shell;
• a tail part of the shield shell is provided with a connecting plate;
• the connecting plate is provided with an opening configured to allow connection of the connecting plate to a side of the model box;
• the rigid plate is arranged at a side inside the shield shell;
• two O-shaped sealing rings are arranged at a tail part of the rigid plate, so as to waterproof the shield tunnel face;
• a side of the rigid plate towards soil is provided with a connecting screw hole and a groove;
• the connecting screw hole is configured to allow the rigid plate to be connected to the loading rod;
• and the groove is configured to accommodate the pore pressure transducer and the earth pressure transducer.