Influences of Roughness Sampling Interval and Anisotropy on Shear Failure Mechanism of Rock Joint Surface

Fan, Chun‐An; Yu, Hongming; Yang, Yilin; Wu, Daoyong

doi:10.3390/en14216902

Cited by 4 publications

(2 citation statements)

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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%

“…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). However, the anisotropic of rough-walled rock fracture during shearing has not been studied in the previous studies.…”

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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