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True triaxial tests – using permeability and extensional stress parameters to simulate geological history in rocks
In most underground facilities, the existence of water and anisotropic stress can create serious problems when excavating and maintaining the underground cavities. In this article, we performed laboratory experiment of true triaxial tests on Shirahama sandstone to investigate the effect of the intermediate principal stress on rock permeability. In the brittle failure regime (low minimum principal stress), the specimen showed a rapid increase in permeability after brittle fracture. At higher minimum principal stress, the permeability decreased with increasing axial strain, but after yield stress, the permeability recovered gradually small. As a result, the final permeability in the specimen after failure was less than the initial value. We focus on the importance of the intermediate principal stress and introduce the observations related to the mechanical characteristics on a wide range of stress states from confined triaxial compression to confined triaxial extension. The true triaxial test is superior in obtaining continuous deformation behaviors from ductile under a compression regime to brittle under an extension regime. The maximum principal stress increased by a finite amount in changing from a compression state to an extension state.
True triaxial tests – using permeability and extensional stress parameters to simulate geological history in rocks
In most underground facilities, the existence of water and anisotropic stress can create serious problems when excavating and maintaining the underground cavities. In this article, we performed laboratory experiment of true triaxial tests on Shirahama sandstone to investigate the effect of the intermediate principal stress on rock permeability. In the brittle failure regime (low minimum principal stress), the specimen showed a rapid increase in permeability after brittle fracture. At higher minimum principal stress, the permeability decreased with increasing axial strain, but after yield stress, the permeability recovered gradually small. As a result, the final permeability in the specimen after failure was less than the initial value. We focus on the importance of the intermediate principal stress and introduce the observations related to the mechanical characteristics on a wide range of stress states from confined triaxial compression to confined triaxial extension. The true triaxial test is superior in obtaining continuous deformation behaviors from ductile under a compression regime to brittle under an extension regime. The maximum principal stress increased by a finite amount in changing from a compression state to an extension state.
True triaxial tests – using permeability and extensional stress parameters to simulate geological history in rocks
Takahashi, Manabu (author) / Park, Hyuck (author) / Takahashi, Naoki (author) / Fujii, Yukiyasu (author)
Geosystem Engineering ; 16 ; 75-82
2013-03-01
8 pages
Article (Journal)
Electronic Resource
English
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