土中爆炸作用的数值分析  

Numerical Analysis of Explosion Process in Soil

作　　者：赵均海[1] 冯红波 田宏伟 魏雪英[1] 

机构地区：[1]长安大学建筑工程学院,陕西西安710061 [2]武汉市建筑设计院,湖北武汉430014 [3]昆山市建筑设计有限公司,江苏昆山215300

出　　处：《建筑科学与工程学报》2011年第1期96-99,117,共5页Journal of Architecture and Civil Engineering

基　　金：陕西省自然科学基础研究计划项目(SJ08E204)

摘　　要：采用ANSYS/LS-DYNA有限元分析软件,对集团药包的土中爆炸作用进行了数值模拟,研究了爆炸作用下土介质的动力响应、爆腔的形成和发展规律及土中爆炸波的传播规律。结果表明:炸药爆炸后在土中留下一个充满爆炸气体的空腔(爆腔),爆腔半径约为炸药原半径的7倍,当爆炸波波阵面到达测定单元时,压力瞬间达到峰值,然后随着时间的增长逐渐降低,趋于平缓,且随着折合距离的增大,峰值压力不断减小;数值模拟的结果与理论计算结果吻合较好。A numerical simulation of explosion process with concentrated charge in soil was carried out by using finite element analysis software ANSYS/LS-DYNA.The dynamic response of soil medium,the formation and development law of explosion cavity and the explosion wave propagation law in soil were investigated.The results indicate that the radius of explosion cavity is about seven times original radius of concentrated charge.When the wave-amplitude face of explosion wave gets to the testing elements,pressure at that position increases to a peak value of overpressure instantly and then gradually decreases with time.The peak pressure falls obviously with increasing of scale distance.The numerical simulation results agree well with the theoretical calculation results.

关 键 词：土中爆炸 集团药包 爆腔半径 折合距离 峰值压力 

分 类 号：TU431[建筑科学—岩土工程]