分布式光纤测温系统在钻孔桩水下混凝土灌注深度检测中的应用  

Application of Distributed Temperature Sensing System in Detection of Underwater Concrete Pouring Depth of Drilled Piles

作　　者：应泽哲 杜文博 申翃[1,2,3] 秦月 YING Ze-zhe;DU Wen-bo;SHEN Hong;QIN Yue(School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,China;Hubei Key Laboratory of Roadway Bridge and Structure Engineering,Wuhan University of Technology,Wuhan 430070,China;Sanya Science and Education Innovation Park,Wuhan University of Technology,Sanya 572000,China;Power China Huadong Engineering Corporation Limited,Hangzhou 310014,China)

机构地区：[1]武汉理工大学土木工程与建筑学院,武汉430070 [2]武汉理工大学道路桥梁与结构工程湖北省重点实验室,武汉430070 [3]武汉理工大学三亚科教创新园,三亚572000 [4]中国电建集团华东勘测设计研究院有限公司,杭州310014

出　　处：《武汉理工大学学报》2024年第8期75-82,102,共9页Journal of Wuhan University of Technology

基　　金：国家自然科学基金(42122051,41972271,42177127);海南省科技专项资助项目(ZDKJ2021024);中国电建集团华东勘测设计研究院有限公司科技攻关项目(KY2021-KC-02-05)。

摘　　要：利用一种分布式高精度温度测量系统DTS (Distributed Temperature Sensing System,DTS)来有效识别水下混凝土的浇灌深度。通过室内试验、热力学数值分析得到一种新型多模光纤的布置方式,结合混凝土桩浇筑过程中的温度场变化规律,提出了一种能有效监测水下混凝土浇筑深度的量测方法。结果表明,混凝土在浇筑后会与周围环境产生复杂的热传导,利用多模光纤测温系统能够测量不同深度的温度变化,其精度可达0.1℃;在浇筑时间不超过60 min的情况下,传感器布置应该满足相邻测点垂直方向高度差不大于0.08 m,即光纤空间分辨率不低于80 mm,DTS可较为准确判别混凝土实时灌浆液面。值得注意的是,浆液的配比以及外加剂的不同会对文中的结果产生一定影响。A distributed temperature sensing System(DTS) was used to effectively identify the depth of underwater concrete.Through laboratory test and thermodynamic numerical analysis,a new arrangement mode of multi-mode optical fiber was obtained.Combined with the temperature field variation rule in the process of concrete pile pouring,a measuring method which can effectively monitor and explore the depth of concrete pouring in the process of underwater pouring was proposed.The results show that the concrete will produce complex heat conduction with the surrounding environment after pouring,and the multi-mode optical fiber temperature measurement system can measure the temperature change at different depths,and its accuracy can reach 0.1 ℃.Considering that the pouring time is not more than 60 min,the sensor layout should meet the height difference of the adjacent measuring points in the vertical direction is not more than 0.08 m,in other words,the spatial resolution was not less than 80 mm,and the DTS can identify the real time grouting level of concrete accurately.It is worth noting that the ratio of slurry and the different admixtures will have a certain impact on the results of this paper.

关 键 词：DTS 水下浇筑 实时液面 混凝土桩 热力学数值分析 

分 类 号：TU473[建筑科学—结构工程]