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中文摘要：
岩土体爆炸破坏问题是岩土工程领域的研究热点,为开展小当量集团装药在不同埋置深度时的土中爆炸效应分析研究,在LS-DYNA框架内建立基于光滑粒子流体动力学-有限元耦合方法（SPH-FEM）的砂土地基爆炸效应分析模型。计算结果表明：浅埋装药时最大爆坑深度到达时刻远在最大爆坑直径之前,地基表层砂土体剪切流场对爆坑直径的发展具有决定性作用;随着药包埋置深度的增加存在一个临界爆坑直径,爆坑直径近似认为只与药包当量和埋置深度相关,经简化与经验假定之后得到的爆坑直径与埋药深度之比与比例距离近似呈直线关系;砂土中爆炸波在近区表现为强间断的冲击波形式,压缩作用是造成近区砂土大变形流动的主要因素,而在爆炸远区则转变为连续的应力波形式;土中爆炸波峰值压力随比例爆距的衰减规律与经验曲线基本一致。研究结果可以为地基工程的抗爆设计及加固提供参考。
英文摘要：
Blast-induced destruction in rock and soil is a research focus in geotechnical engineering.Based on a coupled smooth particle hydrodynamics-finite element method（SPH-FEM） algorithm in the frame of LS-DYNA,a numerical model of analyzing explosion in sand foundation is established to study the explosion effects of small equivalent group charges at different depths of burial（DOB）.The crater depth reaching to maximum is prior to the crater diameter reaching its maximum value.The shearing flow of surface layer sand plays significant effect on the evolution of crater diameter.With the increase of DOB,a critical crater diameter can be obtained.Since it can be considered the crater diameter is only related to explosive equivalent and DOB,therefore a basically linear relationship is proposed between crater diameter relative to DOB and scaled distance.Compression waves appearing the similar features of strong discontinuous shock,dominate in the close-in region of explosion.Large deformation of sand is mainly induced by compression.At far field,the blast waves change to the continuous shear waves with reduced amplitude.Attenuation law of peak pressure has a good coincidence with the empirical predictions.The analysis results can provide reference for design and reinforcing of foundation structures to resist blast load.
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