相对介电常数波动性对雷达检测精度的影响研究
Study on the Influence of Relative Permittivity Fluctuation on Radar Detection Accuracy
周明城1
作者信息
- 1. 福州铁建工程质量检测有限公司,福建 福州 350011
- 折叠
摘要
在隧道衬砌结构中,采用地质雷达进行二衬厚度检测是隧道施工质量验收的重要手段,但地质雷达法判定二衬厚度与相对介电常数的选取密切相关.一旦相对介电常数的取值不当,则通过地质雷达法得到的二衬厚度也将失去参考意义.文中介绍了地质雷达法检测隧道二衬厚度的基本原理,对三组混凝土标准试块的相对介电常数进行跟踪检测.结果表明,达到 28d龄期后,同条件下混凝土的相对介电常数波动性较小,对二衬厚度检测精度的影响有限.衬砌实体段落检测结果显示,在不同设计强度段落进行检测时,应考虑相对介电常数波动性对雷达检测精度的影响,涉及到合格线判定的二衬部位,宜通过验证手段进行最终结果的判定.
Abstract
The use of ground penetrating radar for detecting the thickness of the secondary lining in tunnel lining structures is an important means for quality acceptance during tunnel construction.However,the determination of secondary lining thickness by ground penetrating radar method is closely related to the selection of relative permittivity.Once the value of relative permittivity is not chosen appropriately,the thick-ness of the secondary lining obtained by ground penetrating radar method will lose its reference significance.The paper introduces the basic principle of ground penetrating radar method for detecting the thickness of tunnel secondary lining,and through the tracking detection of relative permittivity on three groups of standard concrete test blocks,the results show the relative permittivity of concrete under the same conditions has minimal fluctuation after reaching the age of 28 days,and its influence on the accuracy of secondary lining thickness detection is very limited.However,the results of detecting haven-built tunnel lining structures show that when detecting in different design strength sections,the influ-ence of relative permittivity fluctuation on radar detection accuracy should be considered.For the secondary lining parts involving pass/fail line determination,it is advisable to use verification methods to determine the final results.
关键词
地质雷达/相对介电常数/波动性/检测精度Key words
Ground penetrating radar/Relative permittivity/Fluctuation/Detection accuracy引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据