基于冲击弹性波的CT技术的原理及在水工混凝土结构无损检测中的应用  

Fundamentals of impact elastic wave-based CT and its application to non-destructive inspection of hydraulic concrete structures

作　　者：吕小彬[1,2,3] 孙其臣[1,2,3] 鲁一晖[1,2,3] 王荣鲁[1,2,3] 吴佳晔[4] 

机构地区：[1]中国水利水电科学研究院结构材料研究所,北京100038 [2]流域水循环模拟与调控国家重点实验室,北京100038 [3]水利部水工程建设与安全重点实验室,北京100038 [4]四川理工学院建筑工程学院,四川自贡643000

出　　处：《水利水电技术》2013年第10期107-112,共6页Water Resources and Hydropower Engineering

基　　金：水利部"948"项目(201301);中国水利水电科学研究院科研专项(结集1246)

摘　　要：本文阐述了基于冲击弹性波的弹性波层析扫描(CT)技术的基本原理和在两个典型水工混凝土结构内部质量无损检测中的实际应用情况。冲击弹性波一般由激振锤激发,能量大且集中,测试深度显著提高,现场操作简便,对工作面要求低,与传统的超声波方法相比具有明显的优越性;检测设备自身先进的接收、采集、滤波、分析手段使测试结果受介质内杂散波的影响很小,保证了检测的精度,大大缩短了检测、数据采集、分析、形成结果的时间;检测得出的弹性波(P波)波速能够与混凝土的力学性能(动弹性模量和强度)建立直接的物理相关关系。以上优点将会使本项技术在水工混凝土结构无损检测领域得到更为广泛的应用。The fundamental principles of the impact elastic wave-based computerized tomography method and its practical appli- cation to the non-destructive inspection of two hydraulic concrete structures are expatiated herein. The impact elastic wave is u- sually excited by a spherically-tipped hammer; from which the energy generated is large and concentrated enough to enhance the testing depth significantly with the merits of easy in situ operation and lower requirement on the working surface. Thus, this method has more obvious advantages, if compared with the conventional ultrasonic testing method ; i. e. the advanced data col- lection, signal filtering and post-analysis modules incorporated into the testing apparatus make the testing result less affected by the stray waves in the medium, and then the result accuracy is ensured and the time needed for testing, data collection and for- mation of result is largely shortened, while the P wave velocities obtained from the test can be directly related to the desired me- chanical properties（ dynamic elastic modulus and compressive strength）of concrete. In view of all these advantages, the impact elastic wave method will surely be promoted for broader application to the non-destructive inspection of hydraulic concrete struc- tures.

关 键 词：水工混凝土结构 无损检测 冲击弹性波 弹性波CT 

分 类 号：TV698[水利工程—水利水电工程]