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The dynamic response of underground structures under blast loading is of great military significance to strategically valuable targets, and the difference in the dynamic response of underground structures at different blast angles is investigated based on a FEM-DEM coupled method. First, a full-time numerical simulation under blast loading is carried out. Then, the displacement and fracture characteristics of the underground structure are analyzed quantitatively. The results indicate that the spatial distribution of displacement and initial fracture type is closely related to the position of the explosive. The concrete at the top boundary and right boundary reaches the opposite boundary earliest at 90° and 0° respectively. The time-history curves of crack ratio have obvious stage characteristics, the maximum tensile crack ratio is obtained at 90°, and the maximum shear crack ratio is obtained at 0°.

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Study of Difference in Dynamic Response of Underground Structure at Different Blast Angles

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  • 出版模式：

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  • 发表日期：

    2025年

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  • Qindong Lin,
  • Chun Feng,
  • Yundan Gan,
  • Jianfei Yuan,
  • Wenjun Jiao,
  • Ying Yang

摘要

The dynamic response of underground structures under blast loading is of great military significance to strategically valuable targets, and the difference in the dynamic response of underground structures at different blast angles is investigated based on a FEM-DEM coupled method. First, a full-time numerical simulation under blast loading is carried out. Then, the displacement and fracture characteristics of the underground structure are analyzed quantitatively. The results indicate that the spatial distribution of displacement and initial fracture type is closely related to the position of the explosive. The concrete at the top boundary and right boundary reaches the opposite boundary earliest at 90° and 0° respectively. The time-history curves of crack ratio have obvious stage characteristics, the maximum tensile crack ratio is obtained at 90°, and the maximum shear crack ratio is obtained at 0°.