Depth Variability of Compressive Strength Test Results of Toki Granite from Shobasama and Mizunami Construction Sites,Japan |
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Authors: | Flavio Lanaro Toshinori Sato Shigeo Nakama |
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Institution: | (1) Japan Atomic Energy Agency, Mizunami, Japan;(2) Present address: Grontmij AB, Stockholm, Sweden;(3) Present address: The Agency for Natural Resources and Energy (ANRE), METI, Tokyo, Japan;(4) Present address: Japan Atomic Energy Agency, Tokai, Japan |
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Abstract: | This paper studies the depth variability of uniaxial compressive laboratory test results on intact Toki granite (i.e., sound
rock without macroscopic fractures) from the Shobasama and Mizunami Construction Sites, Japan. Some of the depth variability
observed in the laboratory results can be indirectly attributed to the high fracture frequency of the “upper highly fractured
rock domain” from which some of the samples were taken. For samples taken from the “lower sparsely fractured rock domain,”
however, the uniaxial compressive strength of the granite seems to be very strongly correlated to the level of in situ rock
stress (i.e., maximum shear stress) determined by measurement results obtained from hydrofracturing tests. The correlation
between the laboratory results and the level of in situ stress is explained by the damage due to the complex stress path that
the cores undergo during drilling, besides the stress concentrations at the drill-bit/rock contact, which can also affect
the microcracking of the samples. An attempt to adjust laboratory test results to estimate the in situ intact rock strength
of Toki granite based on its correlation with in situ stresses was carried out. |
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Keywords: | Core damage Adjustment Conceptual model In situ stress Intact rock Uniaxial compressive strength Variability with depth |
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