混凝土强度等级对声发射波传播特征的影响  

Effect of Concrete Strength Level on Acoustic Emission Wave Propagation Characteristics

作　　者：虞爱平[1,2] 陈哲涵 吴晓蔓 毛飞腾 陈宣东 YU Aiping;CHEN Zhehan;WU Xiaoman;MAO Feiteng;CHEN Xuandong(College of Civil and Architectural Engineering,Guilin University of Technology,Guilin 541000,China;Guagnxi Key Laboratory of Geomechanics and Geotechnical Engineering,Guilin 541000,China)

机构地区：[1]桂林理工大学土木与建筑工程学院,广西桂林541000 [2]广西岩土力学与工程重点实验室,广西桂林541000

出　　处：《河南科技大学学报（自然科学版）》2023年第6期70-76,M0006,M0007,共9页Journal of Henan University of Science And Technology:Natural Science

基　　金：国家自然科学基金项目(51968014);广西研究生教育创新计划项目(YCSW2023367);广西自然科学基金项目(2022GXNSFAA035553)。

摘　　要：混凝土材料复杂的材料参数和声发射波快速衰减的特性使声发射技术在混凝土领域的应用面临巨大的挑战。为明确混凝土的强度等级对声发射波传播特征的影响,给利用声发射技术评价混凝土损伤创造条件,采用声发射技术,通过参数分析和快速傅里叶变换研究了不同强度等级的混凝土中声发射波的传播行为。结果表明:C30、C40、C50混凝土中,声发射能量衰减系数分别为0.01394、0.01067、和0.00568,强度越高衰减越小;基准波速分别为3966 m/s、4193 m/s和4411 m/s,强度越高波速越快。频率分布随传播距离的增大呈现由高频向低频偏移的趋势,但强度高的混凝土,信号衰减和频率偏移的趋势更缓慢。500 mm以内和500 mm以外接收到的信号波型不同,不利于声发射监测的进行,故在对混凝土进行声发射监测时,传感器的间距应在500 mm之内,以保证监测精度。The application of acoustic emission(AE)in concrete faces great challenges due to complex material parameters of concrete materials and the rapid attenuation characteristics of acoustic emission wave.In order to clarify the influence of concrete strength level on acoustic emission wave propagation characteristics and create conditions for evaluating concrete damage by acoustic emission technology,the acoustic emission technology was used to study the propagation behavior of acoustic emission waves in concrete with different strength levels through parameter analysis and fast Fourier transform.The results show that the attenuation coefficients of AE energy in C30,C40 and C50 concrete are 0.01394,0.01067 and 0.00568,respectively,and the higher the strength is,the smaller the attenuation is.The benchmark wave speeds are 3966 m/s,4193 m/s and 4411 m/s,respectively,and the higher the intensity,the faster the wave speed.The frequency distribution tends to shift from high frequency to low frequency with the increase of propagation distance,but the signal attenuation and frequency deviation of concrete with high strength are slower.The signal wave types received within 500 mm and outside 500 mm are different,which is not conducive to the acoustic emission monitoring.When monitoring the acoustic emission of concrete,the sensor spacing should be within 500 mm to ensure the monitoring accuracy.

关 键 词：混凝土 声发射 强度等级 传播距离 传播特征 

分 类 号：TU582[建筑科学—建筑技术科学] TU112