坑道内化爆载荷数值模拟与泡沫混凝土吸能效应优化分析  

Numerical simulation of blasting load in tunnel and optimization analysis of energy absorption effect of foam concrete

作　　者：吴文溢 钟方平[1] 王春明[1] 王万鹏[1] 熊益波[1] WU Wenyi;ZHONG Fangping;WANG Chunming;WANG Wanpeng;XIONG Yibo(Northwest Institute of Nuclear Technology,Xi’an 710024,China)

机构地区：[1]西北核技术研究所,陕西西安710024

出　　处：《中国测试》2018年第10期43-49,共7页China Measurement & Test

摘　　要：针对密闭空间化爆载荷数值模拟及泡沫混凝土结构吸能效应优化设计问题,该文基于任意拉格朗日-欧拉(ALE)算法建立坑道内化爆的三维数值模型。采用有限元计算软件LS-DYNA对坑道试验进行数值模拟,研究200 kg TNT化爆下泡沫混凝土防护结构的三维构型、横截面积以及道数等因素对其吸能效应的影响。计算结果表明:在坑道内对称面各设置3道等距分布(比例距离为R=0.19 m/kg1/3),半径为1 m圆柱体泡沫混凝土防护结构的吸能效果较优,其超压峰值和100 ms准静态压力值较空腔爆炸分别下降71.4%和37.6%。Aiming at the numerical simulation of the chemical explosion load in the closed space and the optimal design of the energy absorption effect of the foam concrete structure,the three-dimensional numerical model of chemical explosion in the tunnel is set up based on the ALE algorithm.The finite element software LS-DYNA is used to simulate the tunnel test.The influence of three dimensional model,cross section area and number of foam concrete protection structure on energy absorption of 200 kg TNT under chemical explosion is studied.The results show that there are 3 iso-distance distribution in the symmetrical surface of the tunnel(R=0.19 m/kg1/3).The energy absorption effect of the cylindrical foam concrete protective structure with a radius of 1 m is better,and the peak value of overpressure and the quasi-static pressure of 100 ms are decreased by 71.4%and 37.6%respectively than that of the cavity explosion.

关 键 词：坑道 爆炸载荷 泡沫混凝土 消波吸能 超压峰值 

分 类 号：O383[理学—流体力学]