Experimental study on explosion cratering and coupled ground shock in clay

SHI Benjun; LI Jie; GUO Wei; XU Tianhan; XU Xiaohui; LI Gan; JIANG Haiming

doi:10.11883/bzycj-2022-0445

Volume 43 Issue 6

Jun. 2023

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SHI Benjun, LI Jie, GUO Wei, XU Tianhan, XU Xiaohui, LI Gan, JIANG Haiming. Experimental study on explosion cratering and coupled ground shock in clay[J]. Explosion And Shock Waves, 2023, 43(6): 065101. doi: 10.11883/bzycj-2022-0445

Citation:

SHI Benjun, LI Jie, GUO Wei, XU Tianhan, XU Xiaohui, LI Gan, JIANG Haiming. Experimental study on explosion cratering and coupled ground shock in clay[J]. Explosion And Shock Waves, 2023, 43(6): 065101. doi: 10.11883/bzycj-2022-0445

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Experimental study on explosion cratering and coupled ground shock in clay

doi: 10.11883/bzycj-2022-0445

State Key Laboratory of Explosion & Impact and Disaster Prevention & Mitigation, Army Engineering University of PLA, Nanjing 210007, Jiangsu, China

Received Date: 2022-10-14
Rev Recd Date: 2023-02-20

Available Online: 2023-03-22

Publish Date: 2023-06-05

Abstract

Abstract

To study the distribution of the coupled ground impact energy due to underground explosions, the key is to obtain the experimental parameters of the volume of the crater compression zone under the coupling effect between the clay medium and explosion energy. To reveal the relationship between the distribution of the blast coupling ground impact energy in clay and the compression volume of the crater, 10.5 g TNT explosive spheres were used as the blast source, and blast experiments under variable burial depths were conducted in a $\varnothing $1500 mm×1490 mm layered blast test apparatus. The real volume of the crater under different burial depths was recorded by using a three-dimensional scanning equipment, and the pressure data under different distances from the blast center were measured by earth pressure sensors to obtain the blast wave propagation law. Meanwhile, the law of energy distribution of coupled ground impact was theoretically revealed, which is proportional to the volume of medium damage. Three conversion relations of coupling coefficient were given, and the coupling coefficient curve of clay was drawn using the Boltzmann function. The experimental results show that in the range of −0.056 m/kg^1/3≤h≤0.37 m/kg^1/3, as the burial depth of the charge increases, the attenuation coefficient increases, and the peak pressure of the blast core distance also increases, and the share of the explosion impact coupling medium also increases with the increase of the charging burial depth. This indicates that the increase of the charging proportion burial depth intensifies the effects of the explosion. This finding implies that the change in burial depth has a negligible impact on the energy of the explosion impact coupling medium. The critical depth of ground shock effect of compacted clay is about 0.55 m/kg^1/3, which is slightly larger than the radius of underground closed explosion cavity. The experimental value of visible diameter is in good agreement with the corresponding ConWep predicted value. The macroscopic failure critical depth is about 1.46 m/kg^1/3. Combined with the test results, the variation law of the energy distribution of explosion coupling ground impact in clay with the buried depth of the charge ratio is given, and the calculation method of the equivalent closed equivalent of underground explosion is established. This provides a load basis for underground engineering blast resistance research and structural design.
- mechanics of explosion,
- compacted clay,
- critical depth,
- coupling coefficient

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References(25)

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