The breaking process and damage distribution characteristics of concrete are the theoretical basis for improving the quality and safety of concrete impacted by abrasive water jet (AWJ) technology. Therefore, the process of AWJ impacting concrete is monitored online based on acoustic emission (AE) technology in this paper. The results show that the AE signals of AWJ impacting concrete have two peaks in frequency domain, the low frequency signals are generated by AWJ and the high frequency signals are generated by concrete breaking. The autoregressive (AR) model is used to estimate the power spectrum of AE signals. The variations of AWJ signals and concrete crushing signals in the impact process are analyzed based on the power of AE signal defined by the area under the power spectral density (PSD) curve. Through monitoring the development process of erosion hole inside the transparent materials impacted by AWJ, it is verified that the power of the concrete crushing signals after the formation of the erosion hole can reflect the penetration rate well. In addition, the damage characteristics of concrete specimens impacted by AWJ are studied in this paper by measuring the transverse ultrasonic velocity of the specimens before and after impact.

混凝土的断裂过程和损伤分布特征是提高磨料射流技术对混凝土质量和安全性的理论基础。因此，本文基于声发射（AE）技术在线监测AWJ撞击混凝土的过程。结果表明，AWJ冲击混凝土的AE信号在频域上有两个峰值，AWJ产生低频信号，混凝土破坏产生高频信号。自回归（AR）模型用于估计AE信号的功率谱。基于由功率谱密度（PSD）曲线下面积定义的声发射信号的功率，分析了冲击过程中AWJ信号和混凝土破碎信号的变化。通过监测受AWJ影响的透明材料内部的冲蚀孔的发展过程，验证了冲蚀孔形成后混凝土破碎信号的功率可以很好地反映渗透率。此外，通过测量冲击前后试样的横向超声速度，研究了受到AWJ冲击的混凝土试样的损伤特性。