混凝土材料声发射信号的频率特征及其与强度参量的相关性试验研究  

Experimental studies on the frequency characteristics of acoustic emissions in concrete material and its dependences on strength parameters

作　　者：纪洪广[1] 侯昭飞[1] 张磊[1] 文菲菲[1] 

机构地区：[1]北京科技大学金属矿山高效开采与安全教育部重点实验室,北京100083

出　　处：《应用声学》2011年第2期112-117,共6页Journal of Applied Acoustics

基　　金：国家高技术研究发展计划(863计划)重点项目(2008AA062104);国家重大基础研究项目(973计划)(2010CB226803);国家科技支撑计划(2008BAB33B03)

摘　　要：混凝土材料声发射信号频率特征与强度指标的关系是混凝土材料声发射检测技术的重要基础。通过实验,对声发射信号频率特征与混凝土强度指标的相关关系进行了探讨。研究结果表明,在较低的应力水平上,不同强度等级混凝土声发射信号大都是低频信号。而在较高应力水平时,随着强度等级的增加,声发射信号的优势频率则逐渐升高。The correlation between frequency characteristics of acoustic emission signals and strength parameters in concrete materials is important for acoustic emission testing techniques.Through experiments,we studied the correlations between frequency characteristics of acoustic emission signals and strength parameters.The results show that the acoustic emission signals in the concretes at different strength levels usually have low-frequency signal components at low stress levels,while at the higher stress levels,the dominant frequency components of the acoustic emission signals increase gradually with the stress strength level increasing.

关 键 词：混凝土材料 强度特征 声发射信号 频率特征 

分 类 号：TU528.01[建筑科学—建筑技术科学]