(1. College of Water Conservancy and Hydropower Engineering，Hohai University，Nanjing，Jiangsu 210098，China；2. Anhui Survey and Design Institute of Water Conservancy and Hydropower，Hefei，Anhui 230088，China)
Abstract：For the research of the permeability evolution of carbonate rocks under seepage corrosion effect of different solutions，Na2SO4 solution and distilled water were used to conduct rock permeation experiment for 15 d using the hydraulic-mechanical coupling permeability experimental system. The curves of carbonate permeability versus time and the variation of mineral ion concentration in leachate with time corresponding to the design conditions were obtained. The relationship between the law of permeability change，the law of mineral dissolution and various influencing factors was analyzed. The results indicate that the significant changes in the permeability of carbonate rocks in early stage are caused by stress conditions. With the development of experiment，the effect of stress decreases gradually. When the confining pressure and osmotic pressure increase equally，permeability is greatly influenced by confining pressure. The trend of permeability is less affected by minor changes of stress. In the stable stage，the change of rock permeability is the result of the joint action of the corrosion and mineral precipitation of the osmotic solution. The dissolution of Na2SO4 solution is relatively strong，CaCO3 dissolves strongly in the upstream of rock sample. After the concentration of Ca2+ reaches the maximum，the CaCO3 precipitates in the downstream，resulting in the heterogeneity of dissolution process，and finally the permeability decreased. The dissolution of distilled water to carbonate minerals is weak，a small amount of Ca2+ dissolves in the upstream and the dissolution rate of the downstream became lower. The Ca2+ concentration can't reach the supersaturated state along the path，that makes it difficult to precipitate，and the final permeability maintains stability.
盛金昌1，吴彦青1，2，白柯含1，2，杜昀宸1，张肖肖1，周 庆1，李柯雅1. 不同溶液渗透溶蚀作用下碳酸盐岩渗透特性研究[J]. 岩石力学与工程学报, 2019, 38(S2): 3279-3286.
SHENG Jinchang1，WU Yanqing1，2，BAI Kehan1，2，DU Yunchen1，ZHANG Xiaoxiao1，ZHOU Qing1，LI Keya1. Study on the permeability evolution of carbonate rocks under seepage corrosion effect of different solutions. , 2019, 38(S2): 3279-3286.
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2019, Vol. 38 
