Simulation Study on Blast Resistance Test of Blast Wall Based on LS-DYNA Coupling Method

Abstract

In order to study the pressure change with time at the blast face of the blast resistant wall when the shock wave acts on the blast resistant wall after the explosion of TNT explosive, the equivalent model of the blast resistant wall is designed based on the similarity theory, and the TNT near ground explosion test is carried out. During the test, the pressure change data of the design measuring point on the blast resistant wall with time are collected by high-speed data acquisition instrument and pressure sensor, The time history curve of shock wave overpressure was obtained by processing the data. Then, LS-DYNA finite element analysis software is used to establish a separate finite element model of the blast wall. At the same time, the relevant parameters of air, explosive, concrete and ground in the explosion field are set. The numerical simulation of the explosion field is carried out, and the overpressure time history curve at the measuring point is extracted by the finite element analysis post-processing software. Compared with the numerical simulation results, it is found that the numerical simulation results are in good agreement with the experimental data, which indicates that the selection and setting of parameters in the simulation calculation are reasonable. The model and algorithm provide an effective means for the numerical simulation of blast wall in the explosion field.