混凝土重力坝水下接触爆炸下的毁伤特性分析  

Damage characteristic analysis of concrete gravity dams subjected to underwater contact explosion

作　　者：张社荣[1] 孔源[1] 王高辉[1,2] 李宏璧 

机构地区：[1]天津大学水利工程仿真与安全国家重点实验室,天津300072 [2]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072

出　　处：《水利学报》2014年第9期1057-1065,共9页Journal of Hydraulic Engineering

基　　金：国家自然科学基金资助项目(51379141);国家创新研究群体科学基金项目(51021004);天津市应用基础与前沿技术研究计划项目(13JCYBJC19400)

摘　　要：采用常规有限元法研究接触爆炸下的结构破坏特性时,往往将由于网格高度畸变而导致计算中断或错误的结果。考虑炸药、流体、结构之间的动态耦合及混凝土的高应变率效应,采用SPH-FEM耦合方法,其中SPH法用于模拟爆炸近区的坝体大变形,FEM法用于模拟远场坝体响应,构建了混凝土重力坝水下接触爆炸的全耦合模型,对水下接触爆炸下的大坝动态响应及毁伤特性进行分析。研究表明,采用SPH-FEM耦合分析技术可以较好地揭示水下接触爆炸下大坝冲坑形成及其毁伤特性;水下接触爆炸冲击荷载作用下大坝受损程度比水下非接触爆炸时严重,在研究水工大坝抗爆性能时,应重点关注水下接触爆炸下的大坝毁伤特性。When the traditional finite element method is used to study the damage characteristic of structures subjected to contact explosion,the numerical grid might be severely distorted which can lead to the calculation interrupt or wrong results. The charge-fluid-structure interaction and strain rate effect of con-crete material are taken into consideration in the establishment of underwater contact explosion model of concrete gravity dams based on the SPH-FEM coupling method. In which,the SPH method was adopted to model the great deformation of dam near the explosion point,while FEM was used to model the response of dam body far from the point. The dynamic response and damage characteristics of concrete gravity dam subjected to underwater contact explosion are analyzed. The results show that the crater formation and the damage properties of dam subjected to underwater contact explosion can be predicted effectively by the SPH-FEM coupling method. The dynamic response and damage level of concrete gravity dams from underwater contact explosion is significantly higher than that from underwater non-contact explosion. Hence,more attention should be paid to the damage properties of dam when subjected to underwater contact explosion.

关 键 词：混凝土重力坝 SPH-FEM耦合算法 毁伤特性 水下接触爆炸 冲坑 

分 类 号：TV312[水利工程—水工结构工程]