Experimental investigation of the seepage characteristics of a single fracture in limestone with different roughness and seepage fluids

地质学 磁导率 岩土工程 表面光洁度 断裂(地质) 表面粗糙度 溶解 含水层 材料科学 复合材料 地下水 遗传学 生物 物理化学 化学
作者
Lei Gan,Yu Liu,Teng Xu,Lei Xu,Hongying Ma,Weichao Xu
出处
期刊:Journal of Hydrology [Elsevier BV]
卷期号:622: 129699-129699 被引量:13
标识
DOI:10.1016/j.jhydrol.2023.129699
摘要

To investigate the effects of roughness and seepage fluids on the seepage characteristics of limestone with rough fractures, five sets of limestone fracture specimens are obtained using 3D scanning and sculpting techniques, in which each set has the same fracture surface morphology. Both distilled water and sodium sulfate solutions were employed to implement seepage dissolution tests on the five sets of limestone specimens with different joint roughness coefficients (JRC). A novel method for characterizing the fracture surface morphology has been proposed, and the seepage characteristics of individual fractures have been investigated. Also, we analyzed the effects of different JRC and seepage solutions on the seepage parameters including seepage flow, equivalent hydraulic aperture, and permeability. Moreover, we presented a quantitative relationship between JRC and permeability. The results reveal that the seepage flow, equivalent hydraulic aperture, and permeability of each rough specimen under different seepage fluids decrease rapidly in the early stages and stabilize later. The dissolution can enhance the erosion of surface particles in the fracture and promote the seepage flow. The permeability and JRC follow a quadratic function in which the empirical parameters can be expressed as a quadratic function and an exponential function of time. This study can provide a theoretical basis for estimating the permeability of fracture with different roughness under different water environments.
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