文献类型：期刊文献

英文题名：Effects of surface roughness and shear processes on solute transport through 3D crossed rock fractures

作者：Li, Bo[1];Xu, Jiujun[2];Zhong, Jie[2];Huang, Na[3];Zou, Liangchao[4]

机构：[1]Tongji Univ, Coll Civil Engn, Dept Geotech Engn, Shanghai 200092, Peoples R China;[2]Shaoxing Univ, Key Lab Rock Mech & Geohazards Zhejiang Prov, Shaoxing 312000, Peoples R China;[3]Shandong Univ Sci & Technol, Coll Civil Engn & Architecture, Qingdao 266590, Peoples R China;[4]Royal Inst Technol, Dept Sustainable Dev Environm Sci & Engn, S-10044 Stockholm, Sweden

年份：2023

卷号：170

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

收录：SCI-EXPANDED(收录号：WOS:001048108200001)、、EI(收录号：20233014441850)、Scopus(收录号：2-s2.0-85165541661)、WOS

基金：This study has been partially funded by National Natural Science Foundation of China (Grant Nos. 42077252, 42011530122, 51909269) , and Research Fund for Taishan Scholars Project. These supports are gratefully acknowledged.

语种：英文

外文关键词：Crossed rock fracture; Surface roughness; Shear process; Channeling flow; Mixing ratio; Peclet number

外文摘要：The influences of surface roughness and shear processes on fluid flow and solute transport through threedimensional (3D) crossed rock fractures, a vital element of fracture networks, were systematically investigated. Surfaces of tensile fractures created by splitting granite and sandstone samples along its two orthogonal central axes were optically scanned to generate rough-walled crossed fracture models. Shearing processes on the models were realized by assigning experimentally measured normal and shear displacements to one fracture while fixing the other. Fluid flow and solute transport through the models were numerically simulated taking into account different combinations of inlets and outlets, in which distilled water and solution are injected into the two inlets, respectively. The results show that compared to the parallel-plate model, the rough-walled crossed fracture model exhibits obvious flow channelization and fluid redistribution at the intersection, significantly promoting the mixing. The shear process affects the mixing at the intersection as it induces dilation and geometric change of the intersection. Increasing shear displacement can either enhance or reduce the mixing depending on combinations of the inlets and outlets, and the mixing ratio is controlled by the aperture difference between two outlet branches and the surface roughness. Effects of surface roughness, shear displacement and shear-induced dilation on the mixing ratio are quantified, upscaling of which can be potentially useful for fieldscale characterization of solute transport in fractured systems.