PERMEABILITY CHANGES IN A ROCK FRACTURE DURING COUPLED FLUID FLOW AND CHEMICAL DISSOLUTION PROCESSES
A coupled fluid flow and chemical dissolution model in rock fracture is developed in this paper and applied to explain spontaneous changes in permeability that develop within a fracture in limestone under invariant water flow-through condition. This model is solved by using COMSOL Multiphysics and validated through comparing our numerical results with the known experimental measurements in salt rock, which shows our model is credible. The simulated results of coupled fluid flow and chemical dissolution processes of a rough fracture in limestone indicate that: (1) The solute concentration plays an important role on the dissolution process, this causes that the dissolved thickness at inlet is bigger than that at outlet. (2) Flow paths in fracture have no obvious dynamic change but become larger with time during chemical dissolution process. (3) The flux through fracture increases exponentially with time during the dissolution process, which means that related permeability of fracture increases exponentially with time during the dissolution process.
permeability rock fracture eoupled fluid flow and chemical dissolution processes fractal theory numerical model
Jinchang Sheng Xiaochen Xu Meili Zhan Shuyuan He Baoyu Su Jishan Liu
College of Water Conservancy and Hydropower Engineering, Hohai University,Nanjin, Jiangsu 210098, Ch School of Mechanical Engineering, The University of Western Australia,39 Stirring Highway, Crawley W
国际会议
第16届亚太地区国际水利学大会暨第3届水工水力学国际研讨会(16th IAHR-APD Congress and 3rd Symoposium of IAHR-ISHS)
南京
英文
257-262
2008-10-20（万方平台首次上网日期，不代表论文的发表时间）