文献类型：期刊文献

英文题名：Modeling linear and nonlinear fluid flow through sheared rough-walled joints taking into account boundary stiffness

作者：Liu, Richeng[1,2];Wang, Changsheng[2];Li, Bo[3];Jiang, Yujing[2];Jing, Hongwen[1]

机构：[1]China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, Xuzhou 221116, Jiangsu, Peoples R China;[2]Nagasaki Univ, Sch Engn, Nagasaki 8528521, Japan;[3]Shaoxing Univ, Key Lab Rock Mech & Geohazards Zhejiang Prov, Shaoxing 312000, Japan

年份：2020

卷号：120

外文期刊名：COMPUTERS AND GEOTECHNICS

收录：SCI-EXPANDED(收录号：WOS:000517849500026)、、EI(收录号：20200308058204)、Scopus(收录号：2-s2.0-85077948368)、WOS

基金：This study has been partially funded by Natural Science Foundation of China, China (Grant Nos. 51734009, 51979272, 51609136), Natural Science Foundation of Jiangsu Province, China (No. BK20170276), and State Key Laboratory for GeoMechanics and Deep Underground Engineering, China University of Mining and Technology, China (No. SKLGDUEK1906). These supports are gratefully acknowledged.

语种：英文

外文关键词：Rock joint; Shear; Stiffness; Fluid flow; Permeability; Nonlinear flow

外文摘要：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 10(1), 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.