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Tangent modulus method : An original method to measure in-situ rock stress

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Title: Tangent modulus method : An original method to measure in-situ rock stress
Authors: Fujii, Yoshiaki Browse this author →KAKEN DB
Makasi, M. Browse this author
Kodama, Jun-ichi Browse this author →KAKEN DB
Fukuda, Daisuke Browse this author →KAKEN DB
Goto, K. Browse this author
Kumakura, S. Browse this author
Kanaoka, M. Browse this author
Dassanayake, A.B.N. Browse this author
Keywords: Tangent modulus method
In-situ rock stress
Strain rate
Confining pressure
Issue Date: Dec-2018
Publisher: Elsevier
Journal Title: Tunnelling and Underground Space Technology
Volume: 82
Start Page: 148
End Page: 155
Publisher DOI: 10.1016/j.tust.2018.08.005
Abstract: This paper proposed Tangent Modulus Method (TMM) which is an improved oriented core method to determine in-situ rock stresses. In this approach, the cylindrical specimens prepared along different directions from thick core samples were uniaxially compressed twice to a given stress level. The stress value of the bending point in the first loading cycle of the stress-tangent modulus curve is considered as the normal component of the in-situ rock stress along the drilled direction of the specimen. Four types of rocks from soft porous tuff and sandstone to hard crystalline granite was investigated to evaluate the potential of this method. The effects of changes in strain rate, temperature, water content, confining and pore pressure, and stresses larger than the preload on the stress value of the bending point were experimentally investigated on preload specimens to investigate their influence on TMM. Comparison of the stress measurement results by TMM and an overcoring method at AK tunnel in Hokkaido, Japan was also performed to validate the TMM.
Rights: © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 藤井 義明

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