文献类型：期刊文献

英文题名：A PREDICTIVE MODEL OF PERMEABILITY FOR FRACTAL-BASED ROUGH ROCK FRACTURES DURING SHEAR

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

机构：[1]Shandong Univ Sci & Technol, State Key Lab Min Disaster Prevent & Control, Shandong Prov & Minist Sci & Technol, Qingdao 266510, 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, Peoples R China;[4]Shaoxing Univ, Rock Mech & Geohazards Ctr, Shaoxing 312000, Peoples R China;[5]Chongqing Univ, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing 400044, Peoples R China

年份：2017

卷号：25

期号：5

外文期刊名：FRACTALS-COMPLEX GEOMETRY PATTERNS AND SCALING IN NATURE AND SOCIETY

收录：SCI-EXPANDED(收录号：WOS:000409223800014)、、EI(收录号：20173704143466)、Scopus(收录号：2-s2.0-85028804962)、WOS

基金：This study has been partially funded by National Natural Science Foundation of China (Grant Nos. 51379117, 51609136 and 51323004), JSPS-NSFC Bilateral Joint Research Project and China Scholarship Council. These supports are gratefully acknowledged.

语种：英文

外文关键词：Fractal; Surface Roughness; Permeability; Shear

外文摘要：This study investigates the roles of fracture roughness, normal stress and shear displacement on the fluid flow characteristics through three-dimensional (3D) self-affine fractal rock fractures, whose surfaces are generated using the modified successive random additions (SRA) algorithm. A series of numerical shear-flow tests under different normal stresses were conducted on rough rock fractures to calculate the evolutions of fracture aperture and permeability. The results show that the rough surfaces of fractal-based fractures can be described using the scaling parameter Hurst exponent (H), in which H = 3 - D-f, where Df is the fractal dimension of 3D single fractures. The joint roughness coefficient (JRC) distribution of fracture profiles follows a Gauss function with a negative linear relationship between H and average JRC. The frequency curves of aperture distributions change from sharp to flat with increasing shear displacement, indicating a more anisotropic and heterogeneous flow pattern. Both the mean aperture and permeability of fracture increase with the increment of surface roughness and decrement of normal stress. At the beginning of shear, the permeability increases remarkably and then gradually becomes steady. A predictive model of permeability using the mean mechanical aperture is proposed and the validity is verified by comparisons with the experimental results reported in literature. The proposed model provides a simple method to approximate permeability of fractal-based rough rock fractures during shear using fracture aperture distribution that can be easily obtained from digitized fracture surface information.