Experimental and Numerical Investigation of Internal Explosion in an Earth-Covered Magazine

Abstract

Earth-covered magazine has some characteristics that are safer than the above-ground magazine and are more economical than underground magazine. To investigate the pressure distribution and the structural failure under the internal explosion, the scaled tests of the earth-covered magazine were conducted under a 0.5 kg TNT explosive charge. The overpressure in the 0°, 90°, and 180° directions outside the structure and the debris distribution were obtained. The numerical simulations were constructed in LS-DYNA software to analyze the test results. The results show that the external overpressure has a directional characteristic that the maximum and minimum overpressure appear in 0° and 180° directions, respectively. In the double logarithmic coordinate system, the overpressure peaks in three directions are linearly related to the scaled distance. Most of the fragments in the 0° direction hit the ground within the front range of ±60°, and the further fragments (40 m or more) were confined to a limited sector within the front range of ±30°. The internal explosion numerical simulation shows that the concrete cracks first appeared at the roof and the ground, and then the damage occurred at the intersection of the walls, and then the damage occurred at each surface. The maximum debris velocity of the side and rear walls is lower than that of the front wall due to the limitation of the soil. The motion equations of the debris combined with numerical simulation can be adopted to predict the projection distance of fragments.

Study on the Earth-Covered Magazine Models under the Internal Explosion

“…Liu et al [8] and Li et al [9] analyzed the factors infuencing the safety distance of earth-covered magazine, emphasizing the mitigating efect of soil on shock wave overpressure and its efcacy in blocking structural debris pathways. Furthermore, Xu et al [10,11] conducted scaled tests on earth-covered magazines to investigate overpressure and debris distribution in various directions. Tese fndings were integrated with numerical simulations to estimate the distance that concrete fragments would project.…”

Damage Zone of the Reinforced Concrete Beam under Rectangular Explosive Contact Explosions

“…Material parameters such as air and explosives are widely used in the simulation, while different material models are selected when simulating concrete materials. CSC (Continuous Surface Cap) [10], HJC (Johnson-Holmquist Concrete) [16], K&C (Karagozian and Case Concrete) [17], and the RHT model are widely used in the simulation of reinforced concrete explosion damage. The RHT material model [18] was first proposed in 1999 and applied well to the response of concrete under explosive loads [19][20][21].…”