文献类型：期刊文献

英文题名：A novel three-dimensional discrete fracture network model for investigating the role of aperture heterogeneity on fluid flow through fractured rock masses

作者：Huang, Na[1];Jian, Yujing[2];Liu, Richeng[2,3];Li, Bo[4];Sugimoto, Satoshi[2]

机构：[1]China Univ Petr East China, Sch Petr Engn, Qingdao 266580, Shandong, Peoples R China;[2]Nagasaki Univ, Sch Engn, 1-14 Bunkyo Machi, Nagasaki 8528521, Japan;[3]China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, Xuzhou 221116, Jiangsu, Peoples R China;[4]Shaoxing Univ, Ctr Rock Mech & Geohazards, Shaoxing 312000, Peoples R China

年份：2019

卷号：116

起止页码：25

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

收录：SCI-EXPANDED(收录号：WOS:000464359500003)、、EI(收录号：20191206658414)、Scopus(收录号：2-s2.0-85063030053)、WOS

基金：This study has been partially funded by National Natural Science Foundation of China, China (Grant Nos. 51709260, 51609136), the Fundamental Research Funds for the Central Universities, Japan Society for the Promotion of Science (No. P17382), and JSPS Grant-in-Aid for Scientific Research (Number 17H03506). These supports are gratefully acknowledged.

语种：英文

外文关键词：Fracture network; Aperture heterogeneity; Channeling flow; Permeability

外文摘要：Effect of anisotropic aperture on the hydraulic properties of single rock fractures has been systematically investigated, yet the aperture variability of individual fractures in 3D discrete fracture networks (DFNs) is commonly negligible by using parallel-plate fractures. The present study proposed a 3D DFN model with fractures having heterogeneous apertures to estimate the influence of fracture variability on fluid flow. In total, a set of 1280 3D models with increasing fracture densities and fracture lengths are generated and the fluid flow through the models is simulated using a developed numerical code. The influences of aperture heterogeneity and network topology on the flow pattern and permeability of 3D DFNs are estimated. The results show that the network topology provides a first-order frame of geometrical connectivity, and the heterogeneous aperture further allows the flow to select some most transmissive channels within these connected fractures. The DFN model with identical apertures generates a large number of medium-flow rate regions whereas the DFN model with fractures having heterogeneous apertures results in extremely low- and high-flow rate regions. The permeability ratio of the two models is widely spread in terms of a small variation in the average mechanical aperture as a result of strong dependence on the aperture distribution. The average permeability ratio increases significantly first and then approaches to 1.0 with increasing the average mechanical aperture. This allows for the definition of a critical mechanical aperture, above which the permeability can be properly predicted using the DFN model with fractures having identical apertures and below which the permeability is much altered by the aperture variability and the DFN model with fractures having heterogeneous apertures should be employed.