关键词: 混凝土地面, 冲击波传播, 反射超压, 衰减系数

Abstract: In order to further investigate the shock wave reflection characteristics of the concrete floor after the charge explosion, through the theory of shock wave propagation of the charge explosion and the theory of shock wave propagation between the interfaces of different media, the introduction of medium correlation attenuation coefficient β to be analyzed, the shock wave propagation characteristics of the air-concrete interface, analyzed to obtain the coefficient of β, β characterizes the reflection of the concrete floor at different distances from the overpressure, and at the same time, the establishment of a charge Explosion of the finite element model, through numerical simulation to study the reflection characteristics of the concrete floor, analyze the propagation process of the shock wave, to get the value of the reflection of the overpressure at different distances, and further carry out experimental research on the 80 kg TNT charge explosion concrete floor reflection of the overpressure to test the reflection of the overpressure at the point of measurement from the center of the explosion at the level of the distance of 5-20 m, the results show that: the reflection of the overpressure with the distance of the results show that the reflected overpressure with the increase of the distance shows a decreasing trend, and the fitting formula of proportional distance-overpressure under the test condition is derived. Test values and β characterized by the reflection of the value of the overpressure is closer, so the introduction of attenuation coefficient β characterization of the concrete ground reflection of the calculation of overpressure can provide a certain reference for the study of the reflective properties of concrete floors.

Key words: concrete floors, shock wave propagation, reflected overpressure, attenuation oefficient