港珠澳大桥沉管隧道预制节段无损检测方法研究  

Non-destructive tests on the prefabricated segments of immersed tube tunnel of Hong Kong-Zhuhai-Macao sea link project

作　　者：王翩翩[1] 董桂洪 李克非[1] 

机构地区：[1]清华大学,北京100084 [2]中交四航研究院,广东广州510230

出　　处：《混凝土》2015年第8期135-138,142,共5页Concrete

基　　金：国家科技支撑计划(2011BAG07B04)

摘　　要：针对港珠澳大桥预制沉管隧道节段进行了混凝土无损检测方法的研究。首先回顾了混凝土表面透气性测量的TORRENT方法、电阻率测量的WENNER方法以及含水率测量的TRAMEX方法的基本原理及无损检测的现场主要影响因素。通过对11个预制管节在3-56d龄期上的无损检测，分析了混凝土表面透气性、电阻率和表面含水率的统计特征，以及无损检测数据与影响因素之间的相关关系。研究表明：沉管隧道的透气性系数kT较低，56d测试值的离散性较低，沉管混凝土致密性较高且均一性好；电阻率值ρ离散性较小、数值随龄期稳定增长；kT值和P值呈较为稳定的负相关。根据含水率对表面透气性和电阻率的不同影响，提出了用于混凝土质量检验的kT-P双参数准则。This paper reports the in -situ non -destructive tests（NDT） through air permeability, electrical resistance and moisture content measurements on the prefabricated segments of immerged tube tunnel for the Hong Kong - Zhuhai - Macao sea link project.The paper reviews first the theory basis for the devices of air permeability（ TORRENT type） ,electrical resistance（ WENNER type）and moisture content （TRAMEX type）, and the influential factors on these measurements are discussed. On the basis of measurements of 11 segments during hardening ages of 3-56 d, the statistical properties of NDT data are analyzed. The results show that：the kT values are low, the 56 d values have low dispersion and the concrete has good compactness and homogeneity; the （ values are stables and correlated strongly with the hardening age; the kT and p values are inversely correlated, but in a qualitative way. A tentative double - parameter criteflon is proposed using kT -p couples and their statistical parameters to evaluate the quality of in - situ concrete.

关 键 词：港珠澳大桥 沉管隧道 透气性 电阻率 含水率 

分 类 号：TU528.01[建筑科学—建筑技术科学]