Authors: Akutagawa, s; Morimoto, K; Nakamori, E; Mori, S; Baba, S

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Akutagawa, s, Morimoto, K, Nakamori, E, Mori, S & Baba, S 2008, 'Estimation of Axial Force in PS-Anchors by a Magnetic Anisotropy Sensor', in Y Potvin, J Carter, A Dyskin & R Jeffrey (eds), SHIRMS 2008: Proceedings of the First Southern Hemisphere International Rock Mechanics Symposium, Australian Centre for Geomechanics, Perth, pp. 287-295,

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Magnetic anisotropy sensor is used for non-destructive measurement of stresses applied to a nut which is part of the head part on a PS-anchor usually used for stabilising rock mass in large scale underground caverns. Since the stresses in the nut reflect the level of axial force in the anchor, the results of the stress measurement can be used indirectly to estimate the current axial forces of PS-anchors in a non-destructive manner.

Akutagawa, S., Ohi, K., Shimura, T., Ota, M., Yasuhara, K. and Matsuoka, K. (2004) Application of nondestructive stress measurement technique for safety assessment of underground structures. Proceedings Fifth International Symposium on Ground Support in Mining and Underground Construction, Perth, Australia, pp. 457–464.
Akutagawa, S., Ota, M., Yasuhara, K., Oi, K., Shimura, T. and Matsuoka, K. (2005) Use of magnetic anisotropy sensor for stress measurement of steel ribs used for NATM tunnel, Journal of JSCE, No. 805/VI-69, pp. 117–130.
Fujii, T., Ikeda, M. and Matsuoka, K. (1999) Nondestructive stress measurement of steel plates by means of magnetic probe. Proceedings Sixth International Conference on inspection appraisal repairs and maintenance of buildings structures, No. 16, pp. 131–138.

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