Experimental and numerical simulation studies on blast-induced craters in calcareous sand

HUANG Jie; LI Minghong; WU Tuozhan; ZONG Zhouhong

doi:10.11883/bzycj-2022-0556

Volume 43 Issue 10

Oct. 2023

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HUANG Jie, LI Minghong, WU Tuozhan, ZONG Zhouhong. Experimental and numerical simulation studies on blast-induced craters in calcareous sand[J]. Explosion And Shock Waves, 2023, 43(10): 102203. doi: 10.11883/bzycj-2022-0556

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HUANG Jie, LI Minghong, WU Tuozhan, ZONG Zhouhong. Experimental and numerical simulation studies on blast-induced craters in calcareous sand[J]. Explosion And Shock Waves, 2023, 43(10): 102203. doi: 10.11883/bzycj-2022-0556

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Experimental and numerical simulation studies on blast-induced craters in calcareous sand

doi: 10.11883/bzycj-2022-0556

Engineering Research Center of Safety and Protection of Explosion and Impact of Ministry of Education, Southeast University, Nanjing 211189, Jiangsu, China

Received Date: 2022-12-13
Rev Recd Date: 2023-07-10
Publish Date: 2023-10-27

Abstract

Abstract

With the further development of ocean engineering, the dynamic response of calcareous sand sites under strong dynamic loading has received broad attention. In order to investigate the crater characteristics of calcareous sand sites under explosion impact, filed experiments and numerical simulations were conducted. Firstly, a series of field explosion experiments were conducted on calcareous sand sites, with different equivalent sizes and burial depths. The longitudinal and transverse diameter, as well as the depth of craters were measured for each case. Secondly, a new numerical algorithm (FEM-SPH) was used to simulate the formation process of explosion craters, combining the finite element model (FEM) and the smoothed particle hydrodynamics (SPH). Furthermore, the simulated crater dimensions were compared with the experimental results to validate the accuracy of the FEM-SPH model. Thanks to the advantage of the FEM-SPH in simulating large deformations, the crater formation process of ground contact explosions and buried explosions agreed well with the experimental results. The experiment research showed the crater size resulting from buried explosions is larger in calcareous sand compared to siliceous sand. The phenomenon was mainly attributed to the higher porosity and lower interparticle bonding strength of calcareous sand. With the validated FEM-SPH model, parametric analyses, including soil parameters and shapes of charges, were detailed discussed. Under the same equivalent, the influence of soil parameters on the size of the crater was about 6%, while the change in the shape of the charge caused a significant influence on the shape and size of the craters. Finally, empirical formulas were derived to determine the carter diameter and depth under cubic charge explosion according to the FEM-SPH numerical results in calcareous sand sites. The formulas can predict the dimensions of ground contact explosions and buried explosions within different equivalent charge weight ranges (0–500 kg). The above research results provided a useful reference for the blast-resistant protection design and emergency reinforcement of calcareous sand foundations.
- calcareous sand,
- blast crater,
- explosion experiment,
- smoothed particle hydrodynamics

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References(21)

References

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