Proceedings of the Korean Geotechical Society Conference (한국지반공학회:학술대회논문집)

Korean Geotechnical Society (한국지반공학회)
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Non-destructive Measurement of H-beam in Support System using a Magnetic Anisotropy Sensor

자기이방성 응력측정법을 이용한 강아치 지보구조물의 비파괴 계측

  • Yoo, Ji-Hyeung (Researcher an Division, Mecageotech CO., LTD) ;
  • Moon, Hong-Deuk (Dept. of Civil Engineering, Jinju National University) ;
  • Lee, Jae-Ho (Dept. of Civil Engineering, Kyung-Il University) ;
  • Kim, Dae-Sung (Dept. of Civil Engineering, Kyung-Il University) ;
  • Kim, Hyuk (Dept. of Civil Engineering, Kyung-Il university)
  • 유지형 ((주)메카지오텍 연구사업부) ;
  • 문홍득 (국립진주산업대학교 토목공학과) ;
  • 이재호 (경일대학교 토목공학과) ;
  • 김대성 (경일대학교 토목공학과) ;
  • 김혁 (경일대학교 토목공학과)
  • Published : 2010.03.25
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Abstract

Currently in increasing number of urban tunnels with small overburden are excavated according to the principle of the New Austrian Tunneling Method(NATM). Successful design, construction and maintenance of NATM tunnel demands prediction, control and monitoring of ground displacement and support stress high accuracy. A magnetic anisotropy sensor is used for non-destructive measurement of stress on surfaces of a ferromagnetic material, such as steel. The sensor is built on the principle of the magneto-strictive effect in which changes in magnetic permeability due to deformation of a ferromagnetic material is measured in a non-destructive manner, which then can be translated into the absolute values of stresses existing on the surface of the material. This technique was applied to measure stresses of H-beams, used as tunnel support structures, to confirm expected measurement accuracy with reading error of about 10 to 20MPa, which was confirmed by monitoring strains released during cutting tests The results show that this method could be one of the promising technologies for non-destructive stress measurement for safe construction and maintenance of underground rock structures encountered in civil and mining engineering.

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