摘要
地下工程的抗爆防护性能对保障公共安全具有重要意义,而高性能等粒径混凝土能较好地吸收和耗散能量,从而减轻主体结构的破坏。为研究高性能等粒径混凝土对地下工程拱结构抗爆性能的加强效果,基于LS-DYNA有限元软件建立了二维平面模型,分析了压缩波峰值强度和升降压时间对高性能等粒径混凝土复合拱结构抗爆性能的影响。研究结果表明,高性能等粒径混凝土层显著削弱了应力波峰值,改善了混凝土衬砌的整体受力状态,并通过改变应力波传播路径实现能量分散与吸收。同时,升降压时间越短,消波能力越强。在相同爆炸荷载当量下,设置复合拱可大幅降低输入到混凝土衬砌的能量,从而减少混凝土衬砌的损伤。
The blast resistance of underground engineering is of great significance for ensuring public safety,while high-performance equal-sized aggregate concrete can effectively absorb and dissipate energy,thereby reducing damage to the main structure.To investigate the strengthening effect of high-performance equal-sized aggregate concrete on the blast resistance of underground engineering arch structures,a two-dimensional plane model was established based on the LS-DYNA finite element software.The influence of compressive wave peak intensity and pressure rise/fall time on the blast resistance of high-performance equal-sized aggregate concrete composite arch structure was analyzed.The results show that the high-performance equal-sized aggregate concrete layer significantly weakens the peak stress wave,improves the overall stress state of the concrete lining,and achieves energy dispersion and absorption by changing the stress wave propagation path.At the same time,the shorter the pressure rise/fall time,the stronger the wave elimination ability.Under the same explosive load equivalent,setting up a composite arch can significantly reduce the energy input into the concrete lining,thereby reducing the damage to the concrete lining.
作者
时续坤
谭仪忠
顾琳琳
张中威
宋春明
王振
SHI Xukun;TAN Yizhong;GU Linlin;ZHANG Zhongwei;SONG Chunming;WANG Zhen(Nanjing University of Science and Technology;Army Engineering University of PLA)
出处
《防护工程》
2025年第2期13-19,共7页
Protective Engineering
基金
国家自然科学基金项目(52008391,52478378)
江苏省自然科学基金项目(BK20211229)
关键词
爆炸荷载
高性能等粒径混凝土
复合拱结构
动力响应
blast load
high-performance equal-sized aggregate concrete
composite arch structure
dynamic response
