Development of a Deep Underground Explosion Effect Simulation Test System based on Electromagnetic Particle Velocity Measurement Technology

Research on the dynamic mechanical properties of deep underground rock and soil plays a crucial role in the planning, construction and safety assurance of underground engineering projects. The existing related research primarily focuses on the improved split Hopkinson pressure bar (SHPB) test setup, which is inherently limited in its ability to accurately replicate the mechanical conditions of deep underground rock and soil. To address this limitation, a technical framework for simulating the deep underground explosion effects based on electromagnetic particle velocity measurement is proposed. An integrated design is conducted for the high-pressure vessel, pressurization system, magnetic field loading module, sensor module, transmission lines, control module, and data acquisition module, thus developing a deep underground explosion effect simulation test system. The system is capable of applying a hydrostatic water pressure of up to 50MPa to a sample. It features a particle velocity measurement range of 0.028m/s to 6.93×10³m/s, a sensitivity of 72.07mV·s/m, and a response time faster than 0.3µs. The experiment of filled explosion in polymethyl methacrylate (PMMA) is carried out. The high-quality particle velocity signals are obtained through experiment, which verifies the measurement performance of the system. The proposed test system can provide a more powerful experimental and testing means for the study of dynamic mechanical properties of deep underground rock and soil.