Influences of hydraulic gradient, surface roughness, intersecting angle, and scale effect on nonlinear flow behavior at single fracture intersections

Li, Bo; Liu, Richeng; Jiang, Yujing

doi:10.1016/j.jhydrol.2016.04.053

Cited by 116 publications

(44 citation statements)

References 59 publications

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“…Fluid is redistributed at the intersections depending on the number and geometry of fracture segments connected to the intersection [78]. Wilson and Witherspoon [149] experimentally investigated the magnitude of laminar flow interference effects at sing fracture intersections.…”

Section: Effect Of Fracture Intersectionmentioning

confidence: 99%

“…To accurately simulate the nonlinear flow in fractures, the Navier-Stokes (NS) equations should be solved, which are composed of a set of coupled nonlinear partial derivatives of varying orders [21,75,76] and are more complex than solving the cubic law. When fluid flow is in the linear regime, each fracture in the two-dimensional DFNs is represented using a line segment [77], whereas when fluid flow enters the nonlinear regime and the NS equations are solved, the real geometry (void space) of each fracture that is formed with two walls should be incorporated, which to some extent increases the difficulty of establishing the models [40,78]. As a result, both the yearly published papers and yearly cited times with the keywords "nonlinear flow" and "rock mass" are much smaller than those with the keywords "linear flow" and "rock mass," as shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

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A Review of Critical Conditions for the Onset of Nonlinear Fluid Flow in Rock Fractures

Jiang

2017

Geofluids

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Selecting appropriate governing equations for fluid flow in fractured rock masses is of special importance for estimating the permeability of rock fracture networks. When the flow velocity is small, the flow is in the linear regime and obeys the cubic law, whereas when the flow velocity is large, the flow is in the nonlinear regime and should be simulated by solving the complex NavierStokes equations. The critical conditions such as critical Reynolds number and critical hydraulic gradient are commonly defined in the previous works to quantify the onset of nonlinear fluid flow. This study reviews the simplifications of governing equations from the Navier-Stokes equations, Stokes equation, and Reynold equation to the cubic law and reviews the evolutions of critical Reynolds number and critical hydraulic gradient for fluid flow in rock fractures and fracture networks, considering the influences of shear displacement, normal stress and/or confining pressure, fracture surface roughness, aperture, and number of intersections. This review provides a reference for the engineers and hydrogeologists especially the beginners to thoroughly understand the nonlinear flow regimes/mechanisms within complex fractured rock masses.

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Section: Effect Of Fracture Intersectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Review of Critical Conditions for the Onset of Nonlinear Fluid Flow in Rock Fractures

Jiang

2017

Geofluids

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“…Therefore, the development degree of cracks in the coal seam floor has an important influence on the prediction of floor water inrush, the guidance of the mining face, and the layout of the mining roadway [24,25].…”

Section: Fault-water Transmission Ability (C2)mentioning

confidence: 99%

Intelligent Evaluation System of Water Inrush in Roadway (Tunnel) and Its Application

Shi

Xie

Wen

et al. 2018

Water

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Abstract:The risk assessment of mine water inrush is a complicated theoretical and technical problem that concerns hydrogeology conditions, engineering geology, mining conditions, rock mechanics, etc. To address this problem, a software system for the risk assessment of mine water inrush was established. From the matter-element extension theory, combined with the entropy-weight method, a matter-element extension entropy-weight model was constructed to evaluate mine safety. Eleven indices were determined based on the principles of science, rationality, operability, and representation, and each index was quantitatively graded. This system had built-in abundant cases of typical mine water inrush so users could determine the value of the parameter according to the analogy of water inrush cases with similar conditions. Combined with the analysis of typical water inrush cases, a database of water control measures with a strong advisory function was established. Finally, through the case study of a typical mine, it was found that the results of this study agreed with the practical ones, indicating that this system could improve the accuracy and availability of the risk assessment of mine water inrush.

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“…The mechanical behaviors and hydraulic properties of rock masses are greatly influenced by the rock fractures including single fractures, fracture intersections and fracture networks (Berkowitz and Adler, 1998;Darcel et al, 2003;Wei and Xia, 2017). Among them, the single fracture and single fracture intersection are two basic building blocks to study the flow through rock fracture networks (Kosakowski and Berkowitz, 1999;Li et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Hydraulic properties of 3D crossed rock fractures by considering anisotropic aperture distributions

Liu

Jiang²,

Huang³

et al. 2018

Adv. Geo-Energy Res.

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Abstract:This study presents a numerical study on the geometrical and hydraulic properties of a three-dimensional intersected fracture model that is a fundamental element involved in complex fracture networks. A series of rough fracture surfaces were generated using the modified successive random additions (SRA) algorithm. Different shear displacements were applied to the fracture to obtain the anisotropic aperture fields that will be further assigned to the two fractures in the intersected fracture model. The flow was calculated using the Reynolds equation with the continuity conditions addressed at intersection part between the two fracture planes. The evolutions of the aperture distributions, flow channels and equivalent permeability were estimated. The simulation results reveal that as the shear displacement and joint roughness coefficient (JRC) increase, the aperture increases anisotropically, which causes significant fluid flow channeling effects. The main flow channels change from being concentrated in one fracture to the other fracture during the shear, accompanied by the change of the flow rate ratios between two flow planes at the inlet/outlet boundary. During the shear the average contact area accounts for approximately 4% to 15% of the fracture planes, and the actual calculated flow area is about 35% to 42% of the fracture planes, which is smaller than the noncontact area. As the shear displacement and JRC increase, the equivalent permeability of the intersected fracture increases. Therefore, the channeling flow should be considered to interpret the fluid flow through the rough fractures even in the simplest fracture networks.

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Influences of hydraulic gradient, surface roughness, intersecting angle, and scale effect on nonlinear flow behavior at single fracture intersections

Cited by 116 publications

References 59 publications

A Review of Critical Conditions for the Onset of Nonlinear Fluid Flow in Rock Fractures

A Review of Critical Conditions for the Onset of Nonlinear Fluid Flow in Rock Fractures

Intelligent Evaluation System of Water Inrush in Roadway (Tunnel) and Its Application

Hydraulic properties of 3D crossed rock fractures by considering anisotropic aperture distributions

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