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Effects of Strain Rate and Temperature on Bending Point Stress in Tangent Modulus Method

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タイトル: Effects of Strain Rate and Temperature on Bending Point Stress in Tangent Modulus Method
著者: Makasi, Masline 著作を一覧する
Fujii, Yoshiaki 著作を一覧する
キーワード: Tangent Modulus Method
Bending point
Strain rate
Temperature
発行日: 2009年 5月13日
出版者: Graduate School of Engineering, Hokkaido University
誌名: Proceedings of the 3rd International Workshop and Conference on Earth Resources Technology
開始ページ: 116
終了ページ: 123
抄録: Precise measurement of in-situ stress is important in design of underground excavations. Tangent Modulus Method (TMM) is an oriented core based method for measurement of rock stress. Two cycles of uniaxial compressive loading are carried out for rock specimen. The stress-tangent modulus curve, based on the local slope of stress-axial strain curve in the first cycle, shows a bending point. Stress value at the bending point is regarded as the normal stress component of in-situ rock stress in the direction of rock specimen. Experiments were done to clarify the strain rate to be used in TMM and the effects of in-situ rock temperature on TMM. Kimachi sandstone specimens of length 60 mm were preloaded for one hour, simulating in-situ stress. The preloaded stress was then estimated by TMM. This experiment was repeated over a range of strain rates in both dry and saturated specimens. It was clarified that any strain rate between 0.0036 mm/min and 3.6 mm/min can be used. For investigating the effects of temperature, preloading was done in temperature controlled pure water for one hour, followed by TMM in air at room temperature. Between 40℃ and 80℃, temperature at preloading had no significant effect on the TMM stress.
記述: 3rd International Workshop and Conference on Earth Resources Technology "Stepping towards sustainable geo-resources utilization and development". 13-14 May 2009. Hokkaido University Conference Hall, Sapporo, Japan.
資料タイプ: proceedings
URI: http://hdl.handle.net/2115/40223
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 藤井 義明

 

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