A method to obtain artificial sandstone joint specimens for the description of permeability anisotropy-based joint shear deformation

Song, Yu; Liu, Baoguo; Líu, Hao; Shi, Xiaomeng; Ren, Darui; Yu, Mingyuan

doi:10.1007/s40948-021-00245-6

Cited by 2 publications

(2 citation statements)

References 35 publications

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“…Many studies have focused on the effect of shareinduced deformation [17][18][19][20][21][22][23][24]. Kim et al [24] developed analytical and numerical techniques, which combined micromechanics-based continuum (MBC) model analysis and FracMan/Mafic package, for calculating fluid flow through a single rock joint and the transmissivities due to shearing.…”

Section: Introductionmentioning

confidence: 99%

“…Cardona et al created synthetic fractal surfaces using the power law, contact mechanics, and kinematic constraints to explore the evolution of aperture distribution during shear displacement and normal loading. Song et al [23] performed direct shear tests to study the description of permeability anisotropy-based joint shear deformation of natural sandstone replicated by artificial materials. Chen et al [19] carried out direct shear test conditions to study the influence of anisotropy of roughness on the shear failure mechanism of fracture surfaces under constant normal load (CNL).…”

Section: Introductionmentioning

confidence: 99%

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Evolutions of Anisotropic Hydraulic Properties of Rough-Walled Rock Fractures under Different Shear Displacements

2023

Geofluids

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Four cylindrical sandstone samples were extracted from the original rectangular sample with a rough-walled fracture. Each drilling angle (θ) of cylindrical sandstone samples is different to consider the anisotropies of rough-walled rock fractures. For each sample, different flow velocities ranging from 0 m/s to 13 m/s were designed. For a given flow velocity, a series of different confining pressures ( σ n ), including 1.5 MPa, 2.5 MPa, and 3.5 MPa, were applied on the fractured samples. The hydraulic properties of each cylindrical sandstone sample were tested under different shear displacements ( u s ) and σ n . The results show that the hydraulic gradient ( J ) shows an increasing trend with the increment of σ n . With the increment of the Reynolds number ( Re ), the transmissivity ( T ) decreases in the form of the quadratic function. The normalized transmissivity ( T / T 0 ) decreases with the increment of J . The variations in T / T 0 with J can be divided into three stages. The first stage is that T / T 0 approximately holds a constant value of 1.0 when J is small indicating that the fluid flow is in the linear regime. The last two stages are that T / T 0 decreases with the continuous increase of J , and the reduction rate first increases and then decreases. The critical Reynolds’ number ( Re c ) of the sample angle with a drilling angle of 90° is different from that of other samples. The corresponding Re c is 6.52, 28.73, and 32.1 when the shear displacement u s = 2 mm , 3 mm, and 4 mm, respectively. The variations in Re c and J along different drilling angles are significantly obvious. When the confining pressure is large, the effect of anisotropy on Rec is much greater than that of confining pressure.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evolutions of Anisotropic Hydraulic Properties of Rough-Walled Rock Fractures under Different Shear Displacements

2023

Geofluids

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Study on the Influence of Shear Indenter Parameters on the In Situ Shear Strength Test

Xiang

Wen

et al. 2022

Minerals

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Cohesion and friction angle are important indicators of shear strength in mining engineering. Indoor testing methods are detached from the actual state of the rock mass and affected by disturbances and significant dimensional effects that do not fully reflect the shear strength of the rock mass itself. In situ borehole shear testing is of great practical importance because of its low disturbance and high speed. In this paper, a new testing device based on the principle of a rock borehole shear tester was designed to simulate the shear test in the laboratory. Seven shear indenters were designed to test the effect of different tooth heights, spacing, and angles on the shear strength of rock-like specimens, and the damage surface was scanned in three dimensions and compared with conventional triaxial tests and compression shear tests. The results show that as the tooth height increases, the flatness of the press-in damage surface increases, and the results will be closer to the press-shear test. As the spacing increases, the maximum damage angle and the damage surface between the grooves gradually decrease. The tooth angle has little effect on the friction angle, but cohesion decreases significantly when exceeds 60°.

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A method to obtain artificial sandstone joint specimens for the description of permeability anisotropy-based joint shear deformation

Cited by 2 publications

References 35 publications

Evolutions of Anisotropic Hydraulic Properties of Rough-Walled Rock Fractures under Different Shear Displacements

Evolutions of Anisotropic Hydraulic Properties of Rough-Walled Rock Fractures under Different Shear Displacements

Study on the Influence of Shear Indenter Parameters on the In Situ Shear Strength Test

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