高压物理学报2025，Vol.39Issue(12)：64-78,15.DOI:10.11858/gywlxb.20251087
块石形状及空间排布对遮弹性能影响的离散元研究
Discrete Element Analysis on the Influence of Block Shape and Spatial Arrangement on Shielding Performance
摘要
Abstract
Shelter layers,recognized as a critical component in modern military defense systems,are designed to protect strategically important rear assets.Given the prevalent application of block stones as primary filling materials in these protective structures,comprehensive investigations into their fundamental ballistic resistance mechanisms and practical performance optimization have become increasingly crucial for defense engineering.Therefore,the dynamic fragmentation behavior of block stones under high-velocity projectile impact was systematically simulated using discrete element spherical particles and bonded particle model(BPM)in this paper.The process of rigid projectile vertical penetration into densely packed block stone structure was numerically simulated,with the influences of block stone particle size,shape,and spatial arrangement characteristics on its anti-penetration performance being explored.The results revealed two primary energy dissipation mechanisms governing the shelter layer performance:over 90%of the kinetic energy of the projectile was dissipated through the combined effects of inter-block collisions and sliding friction during the penetration process.Meanwhile,the number of break block stones is found to be negatively correlated with the block stone particle size and positively correlated with the aspect ratio(long-to-short axis)of the block stones.Moreover,when single-sized block stones are used in a multi-layer staggered arrangement,the penetration depth of the projectile is primarily determined by the magnitude of the peak penetration resistance.Specifically,the maximum penetration resistance and the minimum penetration depth are exhibited by the scenario with circular block stones of 120 mm particle size.However,when a layered arrangement with block stone particle size gradiently decreasing along the direction of the impact face is employed,the overall blast-resistant effect of the structure is not effectively enhanced.Finally,the results of the study can provide a reference for understanding the underlying mechanism of the shielding effect of block stone structure.关键词
块石破碎/块石形状/空间排布/侵彻性能/离散元法Key words
block fragmentation/block shape/spatial arrangement/penetration performance/discrete element method分类
数理科学引用本文复制引用
罗玉婷,赵婷婷,巨凯萱,王志勇..块石形状及空间排布对遮弹性能影响的离散元研究[J].高压物理学报,2025,39(12):64-78,15.基金项目
国家自然科学基金(12102294) （12102294）
山西省回国留学人员科研资助项目(2022-067) （2022-067）
城市基础设施智能化浙江省工程研究中心开放基金(IUI2023-YB-04) （IUI2023-YB-04）
先进材料与结构冲击安全山西省科技创新领军人才团队项目(202204051002006) （202204051002006）
