文献类型：期刊文献

英文题名：A nonlinear flow model and criterion for 3D natural fracture intersections: Effects of surface roughness and mechanical aperture

作者：Wang, Xiao-Yu[1,2];Zhong, Zhen[2,3];Xie, Xinghua[1,2];Hu, Yunjin[3];Han, Changhai[1,2];Lu, Bin[1,4]

机构：[1]Nanjing Hydraul Res Inst, Natl Key Lab Water Disaster Prevent, Nanjing, Peoples R China;[2]Minist Water Resources, Key Lab Water Sci & Water Engn, Nanjing 210029, Peoples R China;[3]Shaoxing Univ, Sch Civil Engn, Shaoxing, Peoples R China;[4]Minist Water Resources, Res Ctr Levee Safety & Disaster Prevent, Zhengzhou, Peoples R China

年份：2025

卷号：193

外文期刊名：INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES

收录：SCI-EXPANDED(收录号：WOS:001503809100001)、、EI(收录号：20252218532589)、Scopus(收录号：2-s2.0-105006879688)、WOS

基金：This work was financially funded by the National Natural Science Foundation of China (Grant Nos. 42177079 and 42477216) , the Open Fund of Key Laboratory of Flood & Drought Disaster Defense of the Ministry of Water Resources (Grant No. KYFB202308140254) , the Open Fund of Research Center on Levee Safety & Disaster Prevention of the Ministry of Water Resources (Grant No. LSDP202203) , the Science and Technology Department of Jiangxi Province (Grant No. 2023KSG003) , and the Thesis Fund of Nanjing Hydraulic Research Institute (Grant No. Yy124011) . All the supports are gratefully acknowledged.

语种：英文

外文关键词：Fracture intersection; Nonlinear flow behavior; Mechanical aperture; Surface roughness; Inertial permeability; Nonlinear flow model; Critical hydraulic gradient

外文摘要：Characterization of hydraulic behavior of intersected fractures is of great importance for evaluating flow properties within fractured rock masses. Nevertheless, existing flow models that correlate fracture geometries with nonlinear flow behaviors remain limited in predictive accuracy. To develop a nonlinear flow model and criterion based on fracture geometries that accurately represent real-world conditions, a series of threedimensional (3D) intersected fracture models were created using surface morphology extracted from split granite blocks. Then, water flow-through simulations were performed on the generated fracture intersections subjected to varying hydraulic gradient conditions. The results demonstrate complex streamline patterns and significant nonlinear flow processes at fracture intersections with complex geometries. With increased roughness coefficient (JRC), decreased mechanical aperture (em) and reduced aperture ratio (e'), the nonlinearity of flow increases, and the intrinsicpermeability (k) decreases. The critical hydraulic gradient (Jc) associated with the onset of nonlinear flow decreases with increasing JRC, em, and e'. Furthermore, a notable coupling effect of surface roughness and mechanical aperture on the nonlinear flow behaviors of fracture intersections has been revealed. Based on the established relationships between hydraulic properties (Jcand inertial permeability ki) and geometric parameters (JRC and em), a nonlinear flow model and a criterion were proposed to quantitatively determine the fracture permeability under nonlinear flow regimes. This study provides insights into the nonlinear flow behaviors within 3D natural fracture intersections, allowing quantitative identifications of flow regimes and evaluations on the nonlinear permeability. These findings contribute to a more accurate characterization of the hydraulic properties in fractured rock masses.