Effect of contact surface area on frictional behaviour of dry and saturated rock joints

Pirzada, Muhammad Asad; Roshan, Hamid; Sun, Hanqing; Oh, Joung; Andersen, Martin S.; Hedayat, Ahmadreza; Bahaaddini, M.

doi:10.1016/j.jsg.2020.104044

Cited by 30 publications

(11 citation statements)

References 39 publications

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“…Furthermore, the temperature condition is controlled by a temperature control system, where a thermocouple is used to control and measure the sample's temperature during laboratory test. By using an automatic coring machine [26], the standard cylindrical samples with a diameter of 50 mm and a height of 100 mm are taken from the core of a large rock block located at the depth about 862 meters. Therefore, the samples can be considered to be initially saturated/quasisaturated and possess the same characteristics of material.…”

Section: Methodsmentioning

confidence: 99%

Experimental Study on the Permeability of Quartz Sandstone under Coupled Thermo-Hydromechanical Loading

Jia

et al. 2021

Lithosphere

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This paper focuses on the influence of coupled thermo-hydromechanical processes on the permeability of quartz sandstone. The permeability has been studied under five different confining pressures, three different temperatures, and three fluid pressures. The experimental results exhibit that the permeability of quartz sandstone decreases with the increase of confining pressure while it increases with temperature and fluid pressure. The identification of permeability under fully coupled thermo-hydromechanical conditions is also studied via the realization of four coupled tests. One observes that the temperature plays a more important role on the permeability with respect to the fluid pressure. Moreover, the influence of fluid pressure on the permeability of studied sandstone has been amplified by the temperature. The obtained experimental results allow us to get a good understanding of the permeability of quartz sandstone in petroleum engineering and can help us to guarantee the long-term structural stability.

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Section: Methodsmentioning

confidence: 99%

Experimental Study on the Permeability of Quartz Sandstone under Coupled Thermo-Hydromechanical Loading

Jia

et al. 2021

Lithosphere

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“…The effect of dilation and compression on hydro-mechanical behaviour of rock discontinuities are of significant importance in various geotechnical applications such as hydraulic fracturing design, earthquake and seismic analysis, dams and slope stability analysis, CO 2 geo-sequestration operations, contaminant transport modelling, and disposal of nuclear wastes, amongst others (Pirzada et al 2020;Rutqvist and Stephansson 2003;Tsang 1991). A great number of studies have been conducted to understand the hydro-mechanical behaviour of rock joints (Berkowitz 2002;Pirzada et al 2018;Pyrak-Nolte et al 1987;Zimmerman and Bodvarsson 1996).…”

Section: Introductionmentioning

confidence: 99%

Coupled Hydro-Mechanical Behaviour of Rock Joints During Normal and Shear Loading

et al. 2022

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The hydraulic conductivity of rock joints is an important parameter controlling fluid flow in various rock engineering applications. The shearing and normal loading have significant effects on hydraulic conductivity of rock joints, the property of which is mainly controlled by hydraulic aperture. Despite the importance of hydro-mechanical behaviour of rock joints, the fundamental micro-scale processes leading to macro-scale observations remain unexplored partly due to difficulties with in situ measurement of hydraulic aperture and its complex relation to roughness and contact area. Therefore, in this study, a series of experiments coupling fluid flow with normal deformability and direct shear are performed on joints with varying controlled roughness at different normal stresses. Along with measuring stress and flow rate, the time-lapse X-ray micro-computed tomography is carried out to explore the evolution of joint aperture and contact area during the experiments. The results of the normal deformability experiments show that the joint conductivity is well correlated to the mean hydraulic aperture of joint profiles. Such correlation, however, is not apparent for the shearing experiment where under high normal stresses, the flow rate decreases continually indicating that damaged asperities hinder the fluid flow. Despite the trend in the average mechanical aperture not following the flow rate in some cases, the trend in the contact area follows the flow rate very closely throughout the shearing process. In addition, the results reveal that despite an increase in contact area with increase in normal stress, it is not physically possible to reach full contact even for the artificially well-mated samples at a high normal stress of 10 MPa. Finally, a new correlation is proposed to relate the hydraulic aperture to joint average mechanical aperture, contact area and roughness. The correlation estimates the experimental flow rates at both normal and shear loading conditions with good accuracy.

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“…In addition, water flow or fluid flow in general may change along joints, cleavages or fractures (Köppel et al 2019); or fluid flow may generate even new cracks (Mentes 2019). A number parameters of any rock joint can affect shear resistance to a great degree: water content, the filler material between the sides of a joint, exposure to weather (Barton 1973(Barton , 1976Miščević and Vlastelica 2009), length of joint (Barton and Bandis 1982), surface roughness (Barton 1973;Haberfield and Seidel 1999;Grasselli and Egger 2003;Lee et al 2014), the morphology of surface asperities (Patton 1966;Yang et al 2016;Niktabar et al 2017), the dilation angle (Barton 1973;Kumar and Verma 2016), the contact surface (Zhao 1997;Grasselli and Egger 2003;Pirzada et al 2020), inclination of the joint (Buocz et al 2017), and the compressive strength of the joint (Barton 1973; Barton and Choubey 1977;Lee et al 2014).…”

Section: Introductionmentioning

confidence: 99%

“…Buocz et al (2017) also adopted a bilinear criterion for the study of the effect of discontinuity inclination on Opalinus Claystone samples. Pirzada et al (2020) applied an M-C failure criterion based on the results of different natural rock types with different normal strengths (σ c 6.3-143.2 MPa) and artificial rock samples (σ c 27.0 MPa). Tests were performed at σ n 0.5-3.0 MPa.…”

Section: Introductionmentioning

confidence: 99%

The effects of grain size and different multi-stage shearing techniques on shear strength along rock discontinuities

Vattai

Rozgonyi-Boissinot

2020

Int J Geomath

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The effects of grain size and different multi-stage shearing techniques on shear strength along discontinuities were analyzed in this study. Laboratory direct shear tests were carried out on plaster mortar with maximum grain sizes of 0.5 mm and 1.0 mm. All specimen surfaces were essentially similar, copied from the same natural, Hungarian coarse-grained sandstone joint with a low joint roughness coefficient (JRC = 8). Tests within two different normal stress ranges (σn = 0.25–0.5 and 0.5–1.5 MPa) were performed simultaneously. Specimens tested using the technique involving modified shearing with repositioning were sheared three times while being subjected to the same degree of normal stress (shearing sequence n = 1, 2, 3) and those with multi-stage technique without repositioning were subjected to shearing once at three different degrees of normal stress. The changing values of the peak friction angle calculated from the resulting peak shear strength-normal stress data pairs (τp − σn) were examined. Failure curves were estimated using linear regression, according to the Mohr–Coulomb failure criterion. The differences between the various peak friction angles obtained from experiments in which different multi-stage shearing techniques were used tend to increase in significance with the increasing number of shearing sequences. Peak friction angle values vary according to grain size of the material, though further investigations using more grain sizes are required to establish the extent of the effect on shear strength along discontinuities.

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Effect of contact surface area on frictional behaviour of dry and saturated rock joints

Cited by 30 publications

References 39 publications

Experimental Study on the Permeability of Quartz Sandstone under Coupled Thermo-Hydromechanical Loading

Experimental Study on the Permeability of Quartz Sandstone under Coupled Thermo-Hydromechanical Loading

Coupled Hydro-Mechanical Behaviour of Rock Joints During Normal and Shear Loading

The effects of grain size and different multi-stage shearing techniques on shear strength along rock discontinuities

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