Simulation calculation and test verification of detonation wave pressure in rectangular tunnels

DOI:	10.11809/bqzbgcxb2023.08.026
Keywords:	tunnel; detonation wave; peak overpressure; numerical simulation
Abstract:	This paper studies the tests of detonation wave propagation in tunnels, obtains the overpressure time course curve of the sidewall of a tunnel at different blast center distances by numerical simulation, and verifies the correctness of the numerical simulation model by experimental means. By comparing the numerical simulation results and the test data, it is found that, after mixing the equivalent TNT mass of the charge in the tunnel tests, the error range between the numerical simulation overpressure peak and the measured data is within 8.49% to 25.49%, and the numerical simulation error is small when the distance from the blast center is over 15 m. In the equal section tunnel, the peak overpressure difference of the blast wave at the near blast center is more significant, reflecting that the blast wave near the blast center is more disordered. With a longer distance from the blast center, the peak pressure at the same section becomes consistent, indicating that the detonation wave is in a stable propagation state. The research results show that the mixed charge is equivalent to TNT equivalent in the tunnel implosion test, and the feasibility of the peak overpressure method at different locations in the tunnel is studied by using numerical simulation, which provides theoretical guidance for the measurement range and specification selection of the overpressure test sensors in the tunnel test. It also provides support for the evaluation of the explosion damage effect of the tunnel intrusion explosive munitions.
Issue:	Vol. 44 No. 8 (2023)
Published:	2023-08-28
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