DOI: 10.1016/j.compgeo.2020.103452
论文题名: Modeling linear and nonlinear fluid flow through sheared rough-walled joints taking into account boundary stiffness
作者: Liu R. ; Wang C. ; Li B. ; Jiang Y. ; Jing H.
刊名: Computers and Geotechnics
ISSN: 0266352X
出版年: 2020
卷: 120 语种: 英语
英文关键词: Fluid flow
; Nonlinear flow
; Permeability
; Rock joint
; Shear
; Stiffness
Scopus关键词: Compressive strength
; Mechanical permeability
; Navier Stokes equations
; Reynolds number
; Shear flow
; Shearing
; Stiffness
; Surface roughness
; Distribution character
; Hydraulic gradients
; Mechanical boundaries
; Non-linear regimes
; Nonlinear flow
; Rock joint
; Self-affine surfaces
; Stiffness conditions
; Flow of fluids
; fluid flow
; joint
; Navier-Stokes equations
; nonlinearity
; permeability
; Reynolds number
; roughness
; shear flow
; stiffness
英文摘要: This study modeled four hundred fluid flow cases through shear-induced aperture fields of a rough-walled joint with self-affine surface characteristics under different boundary stress and stiffness conditions by solving the Navier-Stokes equations. The results show that as the hydraulic gradient increases from 10−8 to 101, the fluid flow experiences changes characterized by a linear regime, a weak nonlinear regime and a strong nonlinear regime. The permeability is a constant in the linear regime and starts to decline when entering the weak nonlinear regime, and the declining rate gradually converges when reaching the strong nonlinear regime. Such transition is poorly indicated by the global Reynolds number alone; it is instead primarily governed by the magnitudes and distribution characters of local Reynolds numbers. The boundary stiffness has linear/nonlinear relations with the permeability, depending on the magnitude of the joint aperture, which is governed by surface roughness, joint compressive strength and mechanical boundary conditions. With increasing boundary stiffness from 0 to 2.0 GPa/m, the ratio of permeability in y-direction to that in x-direction increases from 2.49 to 26.49 by approximately a factor of 10, suggesting that anomalous flow may prevail in sheared zones with stiff surrounding confinements. © 2020 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/158613
Appears in Collections: 气候变化与战略
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作者单位: State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, 221116, China; School of Engineering, Nagasaki University, Nagasaki, 852-8521, Japan; Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province, Shaoxing University, Shaoxing, 312000, China
Recommended Citation:
Liu R.,Wang C.,Li B.,et al. Modeling linear and nonlinear fluid flow through sheared rough-walled joints taking into account boundary stiffness[J]. Computers and Geotechnics,2020-01-01,120