An improved shear-flow test apparatus and its application to deep underground construction

Jiang, Yujing; Tanabashi, Yoshihiko; Xiao, Jianfeng; Nagaie,

doi:10.1016/j.ijrmms.2004.03.037

Cited by 10 publications

(6 citation statements)

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“…The change in the normal stress, due to the application of normal stiffness (k n ) was calculated as follows [1]:…”

Section: Test Equipment and Proceduresmentioning

confidence: 99%

“…In this system, the CNS boundary condition was achieved by detecting the signal of normal displacement, during shearing, and servo-controlling the normal load applied to the specimen. The change in the normal stress, due to the application of normal stiffness ( ) was calculated as follows [1]:…”

Section: Of 12mentioning

confidence: 99%

“…Underground fracture rock masses consist of the intact rock matrix and various discontinuities. Discontinuities such as joints and fractures play a significant role in the hydro-mechanical behaviors of a host rock mass [1][2][3][4][5][6][7]. Hence, the analysis of the shear-flow behaviors of rock fractures is critical to many mass and energy transport engineering activities, such as nuclear waste disposal, oil, natural gas production, and geothermal energy extraction [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study on the Shear-Flow Coupled Behavior of Tension Fractures Under Constant Normal Stiffness Boundary Conditions

et al. 2019

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This study experimentally investigated the effects of fracture surface roughness, normal stiffness, and initial normal stress on the shear-flow behavior of rough-walled rock fractures. A series of shear-flow tests were performed on two rough fractures, under various constant normal stiffness (CNS) boundary conditions. The results showed that the CNS boundary conditions have a significant influence on the mechanical and hydraulic behaviors of fractures, during shearing. The peak shear stress shows an increasing trend with the increases in the initial normal stress and fracture roughness. The residual shear stress increases with increasing the surface roughness, normal stiffness, and initial normal stress. The dilation of fracture is restrained more significantly under high normal stiffness and initial normal stress conditions. The hydraulic tests show that the evolutions of transmissivity and hydraulic aperture exhibit a three-stage behavior, during the shear process—a slight decrease stage due to the shear contraction, a fast growth stage due to shear dilation, and a slow growth stage due to the reduction rate of the mechanical aperture increment. The transmissivity and hydraulic aperture decreased, gradually, as the normal stiffness and initial normal stress increase.

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“…The change in the normal stress, due to the application of normal stiffness (k n ) was calculated as follows [1]:…”

Section: Test Equipment and Proceduresmentioning

confidence: 99%

Section: Of 12mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental Study on the Shear-Flow Coupled Behavior of Tension Fractures Under Constant Normal Stiffness Boundary Conditions

et al. 2019

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“…The device was further modified to allow the inflow and measurement of tracers. The parts of the device used for shear-flow coupling testing and for permeability testing are called the 'Shearing device part' and 'Permeability mechanism part, ' respectively (Barla et al 2010;Esaki et al 1999;Jiang et al 2004;Giger et al 2011;Qian et al 2011b).…”

Section: Outline Of the Shear-flow Coupling Testsmentioning

confidence: 99%

Mechanical and hydraulic behavior of a rock fracture under shear deformation

et al. 2014

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With regard to crystalline rock that constitutes deep geology, attempts have been made to explore its hydraulic characteristics by focusing on the network of numerous fractures within. As the hydraulic characteristics of a rock are the accumulation of hydraulic characteristics of each fracture, it is necessary to develop the hydraulic model of a single fracture to predict the large-scale hydraulic behavior. To this end, a simultaneous permeability and shear test device is developed, and shear-flow coupling tests are conducted on specimens having fractures with varied levels of surface roughness in the constant normal stiffness conditions. The results show that the permeability characteristics in the relation between shear displacement and transmissivity change greatly at the point where the stress path reaches the Mohr-Coulomb failure curve. It is also found that there exists a range in which transmissivity is not proportional to the cube of mechanical aperture width, which seems to be because of the occurrence of channeling phenomenon at small mechanical aperture widths. This channeling flow disappears with increasing shear and is transformed into a uniform flow. We develop a simulation technique to evaluate the macroscopic permeability characteristics by the lattice gas cellular automaton method, considering the microstructure of fracture, namely the fracture surface roughness. With this technique, it is shown that the formation of the Hagen-Poiseuille flow is affected by the fracture microstructure under shear, which as a result determines the relationship between the mechanical aperture width and transmissivity.

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“…Therefore, accurate evaluation of the shear strength and flow behavior of rock joints is essential for the safe design of deep underground openings and performing underground waste disposal risk assessments (Jiang, Tanabashi, Xiao, & Nagaie, 2004).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the hydraulic aperture of a rock joint using wavelet theory

Mehrishal

Sharifzadeh

2013

Geosystem Engineering

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Both mechanical and hydraulic behaviors of rock joints are closely dependent on joint aperture. Understanding how fracture wall roughness affects the fluid flow is important when modeling many subsurface problems. In this paper, a new evaluation method of joint hydraulic aperture using surface asperities height was developed, and the value of hydraulic aperture under different shear displacements was determined using the multi-scale wave decomposition method based on the wavelet theory and some statistical indices. For this purpose, a high-resolution laser scanning system was applied. The numerical simulations were based on the experimental data obtained by Sharifzadeh, Mitani, Esaki, and Urakawa (2004. Development of evaluation method of rock joint aperture distribution. EUROCK & 53 Geomechanics Colloquium) from a series of hydromechanical shear tests on natural granite rock joints. Using this method, the hydraulic aperture of joint surfaces has been developed for different shear steps to model the fluid flow of rock joints. The modeling procedure of mechanical aperture (or dilation) was precise and reliable. In addition, the proposed procedure appropriately estimated both hydraulic aperture and fluid flow rate. The conformity in the results of modeling and laboratory tests satisfactorily indicated the success of the proposed procedure.

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An improved shear-flow test apparatus and its application to deep underground construction

Cited by 10 publications

References 0 publications

Experimental Study on the Shear-Flow Coupled Behavior of Tension Fractures Under Constant Normal Stiffness Boundary Conditions

Experimental Study on the Shear-Flow Coupled Behavior of Tension Fractures Under Constant Normal Stiffness Boundary Conditions

Mechanical and hydraulic behavior of a rock fracture under shear deformation

Evaluation of the hydraulic aperture of a rock joint using wavelet theory

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