文献类型：期刊文献

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

作者：Li, Bo[1,2];Liu, Richeng[2,3];Jiang, Yujing[2,4,5]

机构：[1]Shaoxing Univ, Rock Mech & Geohazards Ctr, Shaoxing 312000, Peoples R China;[2]Nagasaki Univ, Sch Engn, Nagasaki 8528521, Japan;[3]China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, Xuzhou 221116, Jiangsu, Peoples R China;[4]Shandong Univ Sci & Technol, State Key Lab Min Disaster Prevent & Control Cofo, Qingdao 266590, Peoples R China;[5]Shandong Univ Sci & Technol, Minist Sci & Technol, Qingdao 266590, Peoples R China

年份：2016

卷号：538

起止页码：440

外文期刊名：JOURNAL OF HYDROLOGY

收录：SCI-EXPANDED(收录号：WOS:000378360600037)、、EI(收录号：20161902361608)、Scopus(收录号：2-s2.0-84964937709)、WOS

基金：This study has been partially funded by Grant-in-Aid for Young Scientists (B), Japan (Grant No. 15K18302), and National Natural Science Foundation of China, China (Grant No. 51379117). These supports are gratefully acknowledged.

语种：英文

外文关键词：Nonlinear flow; Fracture intersection; Hydraulic gradient; Surface roughness; Scale effect; Aperture

外文摘要：Fluid flow tests were conducted on two crossed fracture models for which the geometries of fracture segments and intersections were measured by utilizing a visualization technique using a CCD (charged coupled device) camera. Numerical simulations by solving the Navier-Stokes equations were performed to characterize the fluid flow at fracture intersections. The roles of hydraulic gradient, surface roughness, intersecting angle, and scale effect in the nonlinear fluid flow behavior through single fracture intersections were investigated. The simulation results of flow rate agreed well with the experimental results for both models. The experimental and simulation results showed that with the increment of the hydraulic gradient, the ratio of the flow rate to the hydraulic gradient, Q/J, decreases and the relative difference of QJJ between the calculation results employing the Navier-Stokes equations and the cubic law, 6, increases. When taking into account the fracture surface roughness quantified by Z(2) ranging 0-0.42 for J = 1, the value of delta would increase by 0-10.3%. The influences of the intersecting angle on the normalized flow rate that represents the ratio of the flow rate in a segment to the total flow rate, R-a, and the ratio of the hydraulic aperture to the mechanical aperture, e/E, are negligible when J < 10(-3), whereas their values change significantly when J > 10(-2). Based on the regression analysis on simulation results, a mathematical expression was proposed to quantify elE, involving variables off and R-r, where R-r is the radius of truncating circles centered at an intersection. For E/R-r > 10(-2), e/E varies significantly and the scale of model has large impacts on the nonlinear flow behavior through intersections, while for E/R-r < 10(-3), the scale effect is negligibly small. Finally, a necessary condition to apply the cubic law to fluid flow through fracture intersections is suggested as J < 10(-3), E/R-r<10(-3), and Z(2) = 0. (C) 2016 Elsevier B.V. All rights reserved.