Analysis on Quasi-Static Pressure and Ground Motion Under Enclosure Space after Explosion

The parameters of quasi-static pressure and ground motion velocity are important references to ensure the safety of explosion operation in closed space. The analysis on time-frequency domain characteristics of the measured ground motion velocity data and quasi-static pressure data is carried out. The results show that the particle velocity time-history curves and frequency-domain curves are consistent under different proportions of explosive charge. With the increase of detonation center distance, the particle velocity amplitude decreases, and the main frequency band approaches the low frequency band. The proportional charge only affects the amplitude of ground velocity, and it has little effect on the frequency-domain distribution and the main frequency. The quasi-static pressure peak value and attenuation velocity are affected by different mass of sand wall. The smaller the mass of sand wall, the larger the quasi-static pressure peak value after blasting, and the faster the attenuation.