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Keywords: persistent open crack
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Proceedings Papers

Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-507
..., and demonstrated that the air tracer could move through open cracks from under 1mm to over 1 m in width. The smoke tracer was particularly detectable even after having moved about 100m. The method can clarify not only persistent open cracks and loosened zones but also the loosening mechanism such as toppling...

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