考虑球面波效应的水下爆炸冲击因子  

An impact factor for underwater explosion considering effects of spherical wave

作　　者：胡晶[1] 陈祖煜[1] 魏迎奇[1] 张雪东[1] 梁建辉[1] 张紫涛 HU Jing;CHEN Zuyu;WEI Yingqi;ZHANG Xuedong;LIANG Jianhui;ZHANG Zitao(China Institute of Water Resources and Hydropower Research,Beijing 100048,China)

机构地区：[1]中国水利水电科学研究院岩土工程研究所,北京100048

出　　处：《水利学报》2018年第10期1227-1235,共9页Journal of Hydraulic Engineering

基　　金：国家自然科学基金重点项目(51339006)

摘　　要：水工建筑物的安全防护关系着国防和民生安全,目前还缺少有效的指标评估水下爆炸冲击波对大坝等结构的作用。水下爆炸冲击波通常以球状向四周传波,本文推导了球面波作用下结构的总能量,由此建立了水下爆炸冲击因子衡量结构的振动与变形响应。针对正面挡水、背面临空的平板结构,分别开展了数值模拟及离心水下爆炸试验研究,通过数值模拟,验证了在相同冲击因子条件下,爆距的变化几乎不影响平板产生的应变能和动能。随后采用本文所得的冲击因子对离心水下爆炸试验结果进行整理,并与传统的比例距离、平面波冲击因子等指标的分析结果进行对比。本文所得的冲击因子可以统一描述近场和远场水下爆炸作用。Safety and protection of hydraulic structure is significant in national defense. There is no effective index to evaluate the dynamic responses caused by underwater explosion. Generally,the shock wavegenerated by underwater explosion propagates spherically. This paper derives the total energy of structuresubjected to spherical wave. A new impact factor is established,which can be used to evaluate the vibrationand deformation responses of structures. Numerical modeling and centrifugal underwater explosion test wereconducted on air-backed structure to investigate the capability of the impact factor. The numerical results in-dicate that changes of standoff distances almost have no influence on the strain energy and kinetic energyon plate as long as the impact fact is kept constant. Then,the impact factor is used to characterize thecentrifugal test results. The impact factors in this paper are more suitable for both near and far field underwater explosion compared with scaled distance or plane wave impact factor.

关 键 词：冲击因子 球面波 水下爆炸 平板 

分 类 号：TV331[水利工程—水工结构工程]