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岩体的天然裂隙结构与渗流行为异常复杂,岩体裂隙渗流机制与定量描述一直是岩土、矿业、地质、石油及天然气工程高度关注的难点问题.为了探究岩体粗糙裂隙的渗流机制和粗糙结构的影响,本文通过岩体单裂隙物理模型的水渗流实验,利用Weierstrass-Mandelbrot分形函数和PMMA材料制作了不同分形维数粗糙单裂隙的物理模型,利用高速摄相机记录了粗糙裂隙水渗流的全过程,分析了水渗流性质随裂隙粗糙性的变化规律及粗糙结构对渗流机制的影响,阐述了粗糙结构中水渗流的流动阻力构成,建立了水流阻力与裂隙粗糙性关系的分形模型,提出了粗糙单裂隙分形等效渗透系数和计算公式,为理解和定量描述岩体粗糙单裂隙渗流性质及其与裂隙结构之间的关系提供了实验依据和参考.
The natural fracture structure and seepage behavior of rock mass are very complicated, and the percolation mechanism and quantitative description of rock mass fracture have been the most difficult problems that are of great concern in geotechnical, mining, geological, petroleum and natural gas engineering.In order to explore the seepage mechanism and roughness In this paper, the physical model of rough single fractures with different fractal dimensions is made by using the Weierstrass-Mandelbrot fractal function and the water-percolation experiment of the single fracture physical model of rock mass. In the whole process, the variation law of water seepage property with crack roughness and the influence of rough structure on seepage mechanism are analyzed. The flow resistance of water seepage flow in rough structure is expounded, and the fractal model of water flow resistance and crack roughness is established. The fractal equivalent permeability coefficient and calculation formula of rough single fracture are provided, which provide experimental evidence and reference for understanding and quantitatively describing the seepage property of coarse single fracture of rock mass and its relationship with fracture structure.