Modification of Subloading tij Model for Soft Rock


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by Maiko Iwata, Graduate Student; Department of Civil Engineering, Gifu University, Yanagido 1-1, Gifu, 501-1193, n3812101@edu.gifu-u.ac.jp,
Atsushi Yashima, Professor; Department of Civil Engineering, Gifu University, Yanagido 1-1, Gifu, 501-1193, yashima@gifu-u.ac.jp,
Kazuhide Sawada, Associate Professor; River Basin Research Center, Gifu University, Yanagido 1-1, Gifu, 501-1193, sawada@gifu-u.ac.jp,
Masaya Hinokio, Associate Professor; Department of Civil Engineering, Gifu University, Yanagido 1-1, Gifu, 501-1193, hinokio@gifu-u.ac.jp,
Ryota Otsu, Staff, Waterworks & Sewerage Bureau, Nagoya City Office, 2-45, Toyomae-cho, Higashi-ku, Nagoya, 461-0034,



Document Type: Proceeding Paper

Part of: Soil Behavior and Geo-Micromechanics:

Abstract: Soft rock ground is widely distributed in Japan and slope failure of soft rock occurs frequently. It is necessary to understand the mechanical behavior of soft rock and to develop a constitutive model which can appropriately express the mechanical behavior of soft rock. In this research, a series of drained triaxial compression tests were carried out to modify the original constitutive model proposed by Nakai and Hinokio (2004). Based on the experimental results, the change of the yield surface during the shearing process was proposed. As the result, the stress-strain behaviors under different confining stresses were reproduced quantitatively by a modified constitutive model.

Subject Headings: Rocks | Constitutive relations | Mechanical properties | Compression tests | Soft soils | Rock mechanics | Triaxial tests | Japan | Asia

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