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Title |
Research on Improving Tunnel Displacement Measurement Accuracy through Error Correction for Temperature Changes
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Authors |
노병철(Byeong-Cheol Lho) ; 김진환(Jin-Hwan Kim) |
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DOI |
https://doi.org/10.11112/jksmi.2025.29.2.1 |
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Keywords |
광학적 왜곡; 굴절률 보정; 터널 변위; 온도 변화; 토털스테이션 오차 Optical distortion; Refractive index correction; Tunnel displacement; Temperature variation; Total station error |
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Abstract |
The accuracy of tunnel displacement measurement is essential for evaluating structural stability and conducting maintenance effectively.
Total Station (TS) is widely used for tunnel displacement monitoring; however, measurement errors caused by temperature variations and environmental factors remain a significant issue. In particular, optical distortion effects due to refractive index changes and air layer formation have not been sufficiently considered in previous studies, necessitating a more systematic approach.
This study analyzes the impact of temperature fluctuations on displacement measurements in tunnels and develops a mathematical model for correction.
The relationship between air density variations caused by temperature differences and subsequent light refraction phenomena is quantitatively evaluated.
Based on this analysis, a refractive index-based correction model is applied to reduce measurement errors and improve accuracy.
The results demonstrate that applying the proposed correction model improves the accuracy of tunnel displacement measurements by approximately 52.1% compared to conventional methods. Additionally, the study provides a more precise understanding of seasonal displacement variation patterns.
The developed correction model is expected to enhance the reliability of existing TS-based automated measurement systems and could be applied to various underground structures such as subway tunnels and underground storage facilities.
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