Abstract
Measuring accurate wave velocity change is a crucial step in damage assessment of building materials such as rock and concrete. The anisotropy caused by the generation of cracks in the damage process and the uncertainty of the damage level of these building materials make it difficult to obtain accurate wave velocity change. We propose a new method to measure the wave velocity change of anisotropic media at any damage level by full-waveform correlation. In this method, the anisotropy caused by the generation of cracks in the damage process is considered. The accuracy of the improved method is verified by numerical simulation and compared with the existing methods. Finally, the proposed method is applied to measure the wave velocity change in the damage process of rock under uniaxial compression. We monitor the failure process of rock by acoustic emission (AE) monitoring system. Compared with the AE ringing count, the result of damage evaluation obtained by the proposed method is more accurate than the other two methods in the stage of increasing rock heterogeneity. These results show that the proposed method is feasible in damage assessment of building materials such as rock and concrete.
Highlights
Zhaojun (Steven) Li, Yi Qin andRock is widely used as a building material [1]
We calculate the global wave velocity change according to the theory and calculation process in Sections 2 and 3
The method with full-waveform correlation to calculate the wave velocity change is improved from two aspects
Summary
Rock is widely used as a building material [1]. Under the action of external factors, such as load [2], temperature [3], and water [4], it will gradually be damaged and even become unstable. Guokai Zhang et al confirmed that in the evaluation of rock damage, the assessment results obtained by the P-wave velocity measured with the first arrival wave is local evaluation rather than overall evaluation [15]. The wave velocity change of a medium before and after the change is calculated by comparing the time-shift of the coda wave [27] Attempts with this method have been made in the damage assessment of materials [28] such as concrete [29,30], rock [31], and steel bars [32]. To obtain a more accurate measurement method of wave velocity change in SHM and rock or concrete damage assessment, we improve the existing methods from two aspects: time-shift solution and the relationship between time-shift and wave velocity changes. Results obtained by AE ringing count, the existing two methods, and the proposed method compared
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