Examining fluid flow and solute transport through intersected rock fractures with stress-induced void heterogeneity

Wang, Zhihe; Xie, Heping; Li, Cunbao; Wen, Xiangyue

doi:10.1016/j.enggeo.2022.106897

Cited by 10 publications

(3 citation statements)

References 54 publications

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“…With the exhaustion of shallow energy resources and sustainable utilization of underground space, human endeavors have inevitably extended into deeper regions of the Earth. − The rock masses in deep underground engineering are characterized by inherent heterogeneity, often containing an abundance of structural planes such as joints, fissures, and faults. , Meanwhile, the intricate geological structures typically subject the fractured rock underground to true three-dimensional stress with high geostress and elevated pore pressure . The presence of pore pressure in the cracked causes a decrease in the strength of the rock masses, reducing its stability and increasing its susceptibility to failure under stress perturbations. , During the rock failure process, the water diffusion volume change (i.e., Δ V ) can potentially lead to water inrush disaster, significantly jeopardizing the safe construction of underground engineering.…”

Section: Introductionmentioning

confidence: 99%

“… 1 − 3 The rock masses in deep underground engineering are characterized by inherent heterogeneity, often containing an abundance of structural planes such as joints, fissures, and faults. 4 , 5 Meanwhile, the intricate geological structures typically subject the fractured rock underground to true three-dimensional stress with high geostress and elevated pore pressure. 2 The presence of pore pressure in the cracked causes a decrease in the strength of the rock masses, reducing its stability and increasing its susceptibility to failure under stress perturbations.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study on the Response of Cracked Sandstone to the Intermediate Principal Stress Coupled with Pore Pressure

Liang,

Huang,

Zheng

et al. 2024

ACS Omega

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Underground fractured rock masses are susceptible to failure under the combined influence of true triaxial stresses and pore pressure, posing severe threats to personnel and production safety of underground engineering. To investigate the influence of intermediate principal stress (σ 2 ) on the mechanical and water diffusion volume change (ΔV) characteristics during the failure process of cracked rocks under stable pore pressure, this study conducted true triaxial strength experiments on cracked sandstone with stable pore pressure. The results demonstrated that with the increase of σ 2 , crack initiation stress (σ ci ), crack damage stress (σ cd ) and the peak stress (σ 1,peak ) of cracked sandstone initially increase and then decrease. Conversely, ΔV tends to decrease first and then increase with the increase of σ 2 . This inverse relationship indicates that under elevated σ 2 , the decreased strength of cracked rock could lead to an increase in ΔV, which may increase the probability of water inrush disasters. The findings of this study provide a theoretical reference for the stability of rock mass engineering and the prevention of water inrush disasters.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Response of Cracked Sandstone to the Intermediate Principal Stress Coupled with Pore Pressure

Liang,

Huang,

Zheng

et al. 2024

ACS Omega

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“…As fluid flow in fractured rocks is usually dominated by pre-existing fractures or fracture networks, it is therefore essential to evaluate the hydraulic properties of rock fractures, the accurate characterization of which is of great interest for a wide range of engineering applications. These include the extraction and storage of natural resources (oil, gas, and groundwater) (Gale and Raven 1980;Nelson 2001;Schembre et al 2006;Babadagli et al 2015;Ishibashi et al 2020;Guo et al 2022;Wang et al 2022), enhanced geothermal production (Gringarten et al 1975;Bächler and Kohl 2005;Huenges 2010;Grant 2013;Zhao 2016;Sawayama et al 2021), the geological disposal of nuclear waste (Cvetkovic et al 1999;Bodin et al 2003;Neuman 2005;Tsang et al 2015;Thatcher et al 2021), and the geological sequestration of carbon dioxide (Saidi 1987;Nelson 2001;Ringrose et al 2013;March et al 2018; Lee and Babadagli 2021;Pirzada et al 2022). However, the capacity to accurately estimate the hydraulic properties of fractures is hindered by complex influencing factors such as stress conditions (Gale and Raven 1980;Raven and Gale 1985;Yeo et al 1998;Olsson and Barton 2001;Baghbanan and Jing 2008;Rutqvist 2014;, geometric properties (e.g., roughness, aperture dimensions), and fracture stiffness (Zimmerman and Bodvarsson 1996;Konzuk and Kueper 2004;Li et al 2020;He et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Size effect on hydraulic properties of rough-walled fractures upscaled from meter-scale granite fractures

Zhong

Zhang

et al. 2023

Geomech. Geophys. Geo-energ. Geo-resour.

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To better bridge the gap between lab-scale data and larger-scale applications. In this study, an integrated method was developed to investigate the size dependence of fluid flow through rough-walled fractures. Granite fracture surfaces of up to 1 m in size were first scanned to acquire data on their morphology and corresponding surface distribution, the asperity height of which was found to follow a normal distribution. Digital fracture surfaces were then created on the basis of the scanned data and upscaled to 20 m by a statistical method, and individual rough-walled fractures were constructed by superimposing two statistically generated surfaces. Fluid flow through the fractures was subsequently simulated by solving the Reynolds’ equation. The simulated results showed evident links between the hydraulic properties and sample sizes. Specifically, both hydraulic aperture and transmissivity of the fracture varied as sample sizes increased until a threshold ranging from 2 to 5 m, beyond which an invariant transmissivity was attained. Thus, the sample size corresponding to invariant transmissivity could be defined as the representative size, the value of which was found to depend on the fracture aperture and roughness. In particular, whereas the augmentation of the fracture aperture appeared to suppress the size dependence on hydraulic properties, increased roughness tended to increase size dependence. The data and modelling presented herein provide insights into the scale dependence of fluid flow through a single fracture. It is concluded that even samples as large as 1 m may not be sufficient to characterize the hydraulic properties of fractures according to the representative sizes obtained, which usually exceeded 2 m under the conditions specified in the present study.

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Impact of angle patterns at fracture intersections on nonlinear flow behavior and local flow field: a visualization experiment

Wang,

Guo,

Fang

et al. 2024

Hydrogeol J

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Examining fluid flow and solute transport through intersected rock fractures with stress-induced void heterogeneity

Cited by 10 publications

References 54 publications

Experimental Study on the Response of Cracked Sandstone to the Intermediate Principal Stress Coupled with Pore Pressure

Experimental Study on the Response of Cracked Sandstone to the Intermediate Principal Stress Coupled with Pore Pressure

Size effect on hydraulic properties of rough-walled fractures upscaled from meter-scale granite fractures

Impact of angle patterns at fracture intersections on nonlinear flow behavior and local flow field: a visualization experiment

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