Geometric parameters and REV of a crack network in soil

Li, J.H.; Zhang, Li Min

doi:10.1016/j.compgeo.2010.01.006

Cited by 115 publications

(53 citation statements)

References 18 publications

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“…The fracture aperture has been observed to follow lognormal distributions [136][137][138] and incorporated into the theoretical models [32,[139][140][141][142]. Some previous works show that fracture aperture exhibits a power law relationship with fracture length with the exponent varying from 0.5 to 2.0 [66,[143][144][145][146][147].…”

Section: Effect Of Fracture Aperturementioning

confidence: 99%

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 Aperturementioning

confidence: 99%

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

Jiang

2017

Geofluids

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“…In-situ hydraulic tests showed that the fracture aperture (or the permeability per fracture) follows lognormal distributions (Dverstorp and Andersson 1989;Cacas et al 1990;Li JH and Zhang 2010), which were utilized to accommodate the results of field experiments and theoretical models (Long and Billaux 1987;Charlaix et al 1987;Margolin et al 1998). By assuming that the aperture in fracture networks follows a lognormal distribution, De Dreuzy et al (2001bDreuzy et al ( , 2002 studied the hydraulic properties of 2-D random fracture networks, and established a mathematical expression for network permeability as:…”

Section: Permeability and Aperture Distributionmentioning

confidence: 99%

Review: Mathematical expressions for estimating equivalent permeability of rock fracture networks

et al. 2016

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Fracture networks play a more significant role in conducting fluid flow and solute transport in fractured rock masses, comparing with that of the rock matrix. Accurate estimation of the permeability of fracture networks would help researchers and engineers better assess the performance of projects associated with fluid flow in fractured rock masses. This study provides a review of previous works that have focused on the estimation of equivalent permeability of twodimensional (2-D) discrete fracture networks (DFNs) considering the influences of geometric properties of fractured rock masses. Mathematical expressions for the effects of nine important parameters that significantly impact on the equivalent permeability of DFNs are summarized, including (1) fracturelength distribution, (2) aperture distribution, (3) fracture surface roughness, (4) fracture dead-end, (5) number of intersections, (6) hydraulic gradient, (7) boundary stress, (8) anisotropy, and (9) scale. Recent developments of 3-D fracture networks are briefly reviewed to underline the importance of utilizing 3-D models in future research.

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“…Therefore cracks have an important influence on slope stability, and analysis of the stability of slopes with cracks can help in understanding the mechanisms of rainfall-induced landslides. Existing research studies on basic properties of cracks, the formation of cracks in soils, and flow in fractured media (Li et al, 2009a;Li and Zhang, 2010;Morris et al, 1992;Novak et al, 2000;Peron et al, 2009) provide a basis for analysing the influence of cracks on slope stability. Further studies are needed on the influence on slope stability of the characteristics of the crack, such as type, location, density, aperture, length and depth.…”

Section: Role Of Cracks In Rain-induced Slope Instabilitymentioning

confidence: 99%

Stability analysis of rainfall-induced slope failure: a review

Zhang

et al. 2011

Proceedings of the Institution of Civil Engineers - Geotechnica

263

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Rainfall is one of the most significant triggering factors for slope failures in many regions around the world.Numerous research studies have been conducted to investigate infiltration of rainwater into a slope, and the effect of water infiltration on slope stability. In this paper, a review of existing research on infiltration analysis and slope stability analysis under rainfall infiltration is presented. Studies on infiltration analysis with conceptual models, analytical analysis and numerical modelling are first reviewed. The typical pore water pressure profiles in the slope are then discussed. Subsequently, recent developments in analyses of slope instabilities under rainfall conditions using the limit equilibrium method and coupled hydro-mechanical modelling are summarised, and major findings on critical hydrological factors related to rainfall-induced landslides are summarised and discussed. Finally, several research topics are suggested for further study.

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Geometric parameters and REV of a crack network in soil

Cited by 115 publications

References 18 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

Review: Mathematical expressions for estimating equivalent permeability of rock fracture networks

Stability analysis of rainfall-induced slope failure: a review

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