摘要
为研究爆炸条件下土中应力波的时空分布,基于黄土中接触爆炸和半埋爆炸试验,验证了ANSYS/AUTODYN软件建立的计算模型,并在此基础上开展了土中爆炸地冲击效应研究。结果表明:随着土介质深度的增加,感生地冲击峰值减小,而直接地冲击峰值增大,最终,压力和竖向应力时程曲线中的2个峰值减少为1个峰值,据此特征可将土中应力波场分为3个区域,即地表区、近地表区和中心区;当装药比例埋深为−0.05~0.075 m/kg^(1/3)时,随着装药比例埋深的增大,中心区迅速扩大,地表区迅速缩小,近地表区逐渐扩大;当装药比例埋深为0.1~0.4 m/kg^(1/3)时,地冲击作用区的分布趋于稳定;爆炸耦合进入空气和土介质中的动能受炸药类型影响,但在一定范围内,地冲击作用区角度与地面空气冲击波超压冲量和直接地冲击应力冲量之比呈线性相关关系。
In order to investigate the temporal and spatial distribution of the stress wave in the soil produced by buried explosion,the ANSYS/AUTODYN software was employed for modelling and simulation,and the ground shock effect of explosion in soil was analyzed.Based on the relationship between the pressure and volumetric strain of Luoyang loess obtained by predecessors,the relationship between the pressure and density of the impact compaction in the SAND model was modified.The numerical model was validated by the test data,which were measured from the contact explosion and semi-buried explosion test in loess.Then,a total of 22 numerical simulation conditions were examined to study the influence of the scaled buried depth of the charge and the type of the explosive on the ground shock subzones.The results show that as the depth of the soil medium increases,the peak of induced ground shock decreases,while the peak of direct ground shock increases,until the peak of the pressure-time curve and the peak in the vertical stress-time curve finally merge into a single peak.According to the characteristics of the pressure and vertical stress at various depths,the stress wave field in soil can be divided into three subzones consisting of surface subzone,near-surface subzone and central subzone.With the increase of the scaled buried depth of the charge,the central subzone rapidly increases,the surface subzone rapidly decreases,and the near-surface subzone gradually increases from zero,when the scaled buried depth of the charge ranges from−0.05 m/kg^(1/3) to 0.075 m/kg^(1/3).The distribution of the ground shock subzones tends to be stable,when the scaled buried depth of the charge ranges from 0.1 m/kg^(1/3) to 0.4 m/kg^(1/3).The energy of the explosive coupling into the air and soil mediums is affected by the type of the explosive.In certain extent,the angle of the ground shock subzones is linearly related to the ratio of the air-blast overpressure impulse to the impulse of the direct ground shock stress.
作者
刘琦
翟超辰
张跃飞
曲建波
吴祥云
LIU Qi;ZHAI Chaochen;ZHANG Yuefei;QU Jianbo;WU Xiangyun(Civil Engineering and Mechanics College,Xiangtan University,Xiangtan 411105,Hunan,China;Institution of Engineering Protection,IDE,AMS,PLA,Luoyang 471023,Henan,China)
出处
《爆炸与冲击》
EI
CAS
CSCD
北大核心
2022年第8期1-19,共19页
Explosion and Shock Waves
基金
湖南省研究生科研创新项目(CX20190495,CX20200648)。
关键词
地面爆炸
埋置爆炸
直接地冲击
感生地冲击
地冲击作用分区
ground explosion
buried explosion
direct ground shock
induced ground shock
ground shock subzone
