Chapter 26
Damage Evaluation Inside the Concrete
Dam by Tomography and AE Analysis
Y. Yang, H. Asaue, T. Shiotani, and K. Hashimoto
Abstract Although the elastic wave method has received much attention as a
promising NDT method, the utilization of elastic wave on the damage evaluation of
concrete dams still needs in-depth research. Therefore, in this research, the feasibility
of the elastic wave method inside the damage evaluation of concrete dams, including
characterization of the cracks appearing on the dam surface and the automatic continuous monitoring by AE activities were carried out. Sensors were arranged both in the
inspection gallery and the surface of the dam, and the elastic wave was excited by steel
balls of several diameters both in the inspection gallery and the surface of the dam
body. Both elastic wave tomography and surface wave tomography were conducted.
In addition, AE measurement has been conducted in this research, in which the
sensors were arranged horizontally in the inspection gallery. As a result, the length
and the depth distributions of the crack were revealed by elastic wave tomography
and surface wave tomography. In addition, it was confirmed that the sensors arranged
in the inspection gallery could measure AE inside the dam, indicated the possibility
of damage monitoring by AE analysis.
26.1 Introduction
The application of non-destructive inspection (NDT) for damage evaluation of
concrete has been studied all over the world, for it can save both time and money
Y. Yang (B) · T. Shiotani · K. Hashimoto
Department of Civil and Earth Resources Engineering, Kyoto University, Kyoto, Japan
e-mail: yang.yitao.77r@st.kyoto-u.ac.jp
T. Shiotani
e-mail: shiotani.tomoki.2v@kyoto-u.ac.jp
K. Hashimoto
e-mail: hashimoto.katsufumi.8a@kyoto-u.ac.jp
H. Asaue
Department of Urban Management, Kyoto University, Kyoto, Japan
e-mail: asaue.hisafumi.7a@kyoto-u.ac.jp
© The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2021
G. Shen et al. (eds.), Advances in Acoustic Emission Technology, Springer Proceedings
in Physics 259, https://doi.org/10.1007/978-981-15-9837-1_26
313
Damage Evaluation Inside the Concrete
Dam by Tomography and AE Analysis
Y. Yang, H. Asaue, T. Shiotani, and K. Hashimoto
Abstract Although the elastic wave method has received much attention as a
promising NDT method, the utilization of elastic wave on the damage evaluation of
concrete dams still needs in-depth research. Therefore, in this research, the feasibility
of the elastic wave method inside the damage evaluation of concrete dams, including
characterization of the cracks appearing on the dam surface and the automatic continuous monitoring by AE activities were carried out. Sensors were arranged both in the
inspection gallery and the surface of the dam, and the elastic wave was excited by steel
balls of several diameters both in the inspection gallery and the surface of the dam
body. Both elastic wave tomography and surface wave tomography were conducted.
In addition, AE measurement has been conducted in this research, in which the
sensors were arranged horizontally in the inspection gallery. As a result, the length
and the depth distributions of the crack were revealed by elastic wave tomography
and surface wave tomography. In addition, it was confirmed that the sensors arranged
in the inspection gallery could measure AE inside the dam, indicated the possibility
of damage monitoring by AE analysis.
26.1 Introduction
The application of non-destructive inspection (NDT) for damage evaluation of
concrete has been studied all over the world, for it can save both time and money
Y. Yang (B) · T. Shiotani · K. Hashimoto
Department of Civil and Earth Resources Engineering, Kyoto University, Kyoto, Japan
e-mail: yang.yitao.77r@st.kyoto-u.ac.jp
T. Shiotani
e-mail: shiotani.tomoki.2v@kyoto-u.ac.jp
K. Hashimoto
e-mail: hashimoto.katsufumi.8a@kyoto-u.ac.jp
H. Asaue
Department of Urban Management, Kyoto University, Kyoto, Japan
e-mail: asaue.hisafumi.7a@kyoto-u.ac.jp
© The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2021
G. Shen et al. (eds.), Advances in Acoustic Emission Technology, Springer Proceedings
in Physics 259, https://doi.org/10.1007/978-981-15-9837-1_26
313