砂土地基触地爆炸的SPH-FEM耦合分析方法  

Coupled SPH-FEM method for analyzing touchdown explosion in sand foundation

作　　者：王维国[1,2] 刘汉龙[1,2] 陈育民[1,2] 张智超[1,2] 

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210098 [2]河海大学土木与交通学院,江苏南京210098

出　　处：《解放军理工大学学报（自然科学版）》2013年第3期271-276,共6页Journal of PLA University of Science and Technology(Natural Science Edition)

基　　金：国家杰出青年科学基金资助项目(50825901);国家自然科学基金资助项目(50909040);江苏省青蓝工程创新团队资助项目(2016-B01011)

摘　　要：针对砂土地基触地爆炸问题,在LS-DYNA框架内建立了有限元法和光滑质点流体动力学法相耦合的数值分析方法SPH-FEM。该耦合法结合了FEM的高计算效率和SPH在处理土体爆炸大变形方面的优势,通过精确捕捉SPH粒子的运动,可以直观再现爆坑形态的发展全过程,适合描述爆炸大变形问题。数值结果显示,爆炸波在近区表现的强间断冲击波,是造成土体流动大变形的重要因素;土体参数在正常范围的浮动对爆坑尺寸具有一定影响,在设计应用时应予以考虑。利用SPH-FEM耦合法计算得到的爆坑形态和尺寸与ConWep程序经验数据基本一致,验证了SPH-FEM耦合法在分析触地爆炸问题中的正确性。To study the touchdown explosion in sand foundation, a coupled smooth particle hydrodynamic- finite element method （SPH-FEM） was undertaken in the frame of LS-DYNA. The coupled SPH-FEM method combined with high efficiency of FEM and superiority of SPH in dealing with large deformation is appropriate for the description of large deformation induced by explosion. It can reproduce the whole evo- lution of crater through the moving of the particles. The numerical results show that the blast waves show the similar features of strong discontinuous shock in the close=in region of explosion. Large deformation of sand is significantly induced by compression. Variability of soil properties has certain influence on crater sizes and should be considered in design and application. Simulation results of crater shapes and sizes have a good coincidence with the empirical values predicted by ConWep. The coupled method is applicable to blasting simulations.

关 键 词：砂土地基 触地爆炸 SPH—FEM耦合法 

分 类 号：TU437[建筑科学—岩土工程]