基于SPH-FEM耦合法的土体爆炸效应数值研究

›› 2013, Vol. 34 ›› Issue (7): 2104-2110.

基于SPH-FEM耦合法的土体爆炸效应数值研究

王维国^{1, 2}，陈育民^{1, 2}，刘汉龙^{1, 2}，张智超^{1, 2}

1. 河海大学岩土力学与堤坝工程教育部重点实验室，南京 210098；2. 河海大学土木与交通学院，南京 210098

收稿日期:2012-07-13 出版日期:2013-07-10 发布日期:2013-07-15
作者简介:王维国，男，1986年生，博士研究生，研究方向为岩土体动力响应
基金资助:
国家杰出青年科学基金项目(No. 50825901，No. 50909040)；江苏省青蓝工程创新团队资助项目(No. 2016-B01011)。

Numerical simulation of explosion in soil based on a coupled SPH-FEM algorithm

WANG Wei-guo^{1, 2}，CHEN Yu-min^{1, 2}，LIU Han-long^{1, 2}，ZHANG Zhi-chao^{1, 2}

1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China; 2. College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China

Received:2012-07-13 Online:2013-07-10 Published:2013-07-15

摘要/Abstract

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。

关键词: SPH-FEM耦合法, 爆炸效应, 埋置深度, 临界爆坑直径, 峰值压力

Abstract: 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.

Key words: coupled SPH-FEM algorithm, explosion effects, depth of burial, critical crater diameter, peak pressure

中图分类号:

TU 435

王维国，陈育民，刘汉龙，张智超 . 基于SPH-FEM耦合法的土体爆炸效应数值研究[J]. , 2013, 34(7): 2104-2110.

WANG Wei-guo ，CHEN Yu-min ，LIU Han-long ，ZHANG Zhi-chao . Numerical simulation of explosion in soil based on a coupled SPH-FEM algorithm[J]. , 2013, 34(7): 2104-2110.

参考文献

Metrics

Viewed

Full text

Abstract

Cited

Shared

Discussed

本文评价

推荐阅读 10

[1]	刘晓，唐辉明，刘瑜. 基于集对分析和模糊马尔可夫链的滑坡变形预测新方法研究[J]. , 2009, 30(11): 3399 -3405 .
[2]	胡大伟，周辉，谢守益，张凯，邵建富，冯夏庭. 大理岩破坏阶段Biot系数研究[J]. , 2009, 30(12): 3727 -3732 .
[3]	师旭超，韩阳. 卸荷作用下软黏土回弹吸水试验研究[J]. , 2010, 31(3): 732 -736 .
[4]	朱建明，彭新坡，姚仰平，徐金海. SMP准则在计算煤柱极限强度中的应用[J]. , 2010, 31(9): 2987 -2990 .
[5]	原喜忠，李宁，赵秀云，杨银涛. 东北多年冻土地区地基承载力对气候变化敏感性分析[J]. , 2010, 31(10): 3265 -3272 .
[6]	唐利民. 地基沉降预测模型的正则化算法[J]. , 2010, 31(12): 3945 -3948 .
[7]	李占海，朱万成，冯夏庭，李绍军，周辉，陈炳瑞. 侧压力系数对马蹄形隧道损伤破坏的影响研究[J]. , 2010, 31(S2): 434 -441 .
[8]	刘汉龙，王新泉，陈永辉，陆见华. Y型沉管灌注桩加筋路堤力学性状试验研究[J]. , 2009, 30(2): 297 -304 .
[9]	侯公羽，牛晓松. 基于Levy-Mises本构关系及D-P屈服准则的轴对称圆巷理想弹塑性解[J]. , 2009, 30(6): 1555 -1562 .
[10]	蔡辉腾，危福泉，蔡宗文. 重庆主城区粉质黏土动力特性研究[J]. , 2009, 30(S2): 224 -228 .