钢壳混凝土复合结构脱空高度与中子响应关系研究  

Study on the Response Relationship between Neutrons and Void Height of Steel-Shell Concrete Composite Structure

作　　者：赵洪波 刘国庆[1] 范子武[1] 孙龙 孟令超 王琅琅 洪云飞 ZHAO Hongbo;LIU Guoqing;FAN Ziwu;SUN Long;MENG Lingchao;WANG Langlang;HONG Yunfei(Nanjing Hydraulic Research Institute,Nanjing 210029,China)

机构地区：[1]南京水利科学研究院,江苏南京210029

出　　处：《同位素》2024年第4期353-362,共10页Journal of Isotopes

基　　金：中央级公益性科研院所基本科研业务费专项基金(Y122011);珠江三角洲水资源配置工程课题研究(CD88-GC02-2020-0034);广东省重点领域研发计划项目(2019B111105002)。

摘　　要：为了揭示钢壳混凝土复合结构间脱空高度与中子的响应关系,建立一种新的脱空高度定量测量方法,本研究基于快中子慢化和中子散射原理,采用室内等效混凝土物理模拟方法构建脱空模型,并开展室内测试,对测试数据进行回归分析,发现热中子计数率与钢壳混凝土复合结构中钢板厚度、混凝土含水量、脱空高度之间均存在显著的相关性。进一步建立钢壳混凝土脱空高度与热中子计数率的标定关系,并开展验证实验,结果表明,通过标定关系计算得到的混凝土脱空值与实际脱空值误差较小,两者具有较好的一致性,快中子穿透钢板后与混凝土作用产生的热中子可用于定量计算钢壳混凝土复合结构脱空高度,可解决当前脱空检测中存在的无法精确定量问题。In order to reveal the response relationship between the neutrons and void height of steel�shell concrete composite structures,and establish a new quantitative detection method for the void height,based on the principle of fast neutron moderation and neutron scattering,an indoor equivalent concrete physical simulation method was used to construct a void model and conduct tests in this paper.Univariate regression analysis was carried out on the tests data,and it was found that there was a significant linear correlation between the thermal neutron count rate and the steel plate thickness,concrete moisture content and void height in the steel-shell concrete composite structure.The calibration relationship between the void height of steel-shell concrete and the thermal neutron count rate was further established,and the verification test was carried out.The results show that the error between the concrete void height value calculated by the calibration relationship and the actual void height value is small,the two have good consistency,the thermal neutrons generated by the action of fast neutrons penetrated through the steel plate and concrete can be used to quantitatively calculate the void height of the steel-shell concrete composite structure,the neutron method can solve the problem of inaccurate quantification in current detection.

关 键 词：中子 钢壳混凝土 脱空高度 响应关系 回归分析 

分 类 号：TL99[核科学技术—核技术及应用]