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Title |
Estimation of Shape of Voids behind Concrete Tunnel Linings Using Radar of Three Dipole Antenna Type
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Keywords |
비파괴검사; 공동 형상; 콘크리트 터널 라이닝; 레이더; non-destructive test; void shape; concrete tunnel lining; radar |
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Abstract |
The presence of voids behind tunnel linings is very likely to result in settlement or structural collapse. One proposed method of detecting such voids by non-destructive method is radar. More than effectively judging the existence of voids behind tunnel linings, this study aims to develop the analysis algorithm of radar capable of estimation of the shape of specific voids. To acquire directional information and estimate the shape of three-dimensional voids, the radar of three-dipole antenna type is used. As a foundation to this ongoing research, an investigation of microwave polarization methods using three-dipole antenna carried out with various void orientations and void geometries. As a result, it is clarified that the response of four microwave polarization modes depends on void geometry and thus there is a possibility of identifying the geometry and orientation (the shape) of specific voids using radar of three-dipole antenna type.
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