Analysis of Fracture Surface Morphology and Study of Seepage Diffusion Characteristics: Fid-Bau Portal

Analysis of Fracture Surface Morphology and Study of Seepage Diffusion Characteristics

Li, Zheng / Mao, Kun / Liu, Jie / Zhang, Kexin

There are a large number of rough and irregular fractures in underground engineering rock mass, which makes the movement of fracture fluid very complex. To address the issues of non-visibility of physical model tests and non-repeatability of joint surfaces in natural rock fractures, a method was proposed to accurately depict the impact of rough fracture morphology on rock seepage. This method involved using natural rock fractures as a prototype and creating secondary molds using gypsum and silica gel to precisely replicate the rough fracture surface morphology. The three-dimensional morphology scanning technology was used to accurately obtain the surface morphology information of rough fractures, and the anisotropy of rough fracture morphology parameters was analyzed. Additionally, the study investigated the characteristics of seepage area and frontal flow line morphology through the use of a visual transparent fracture model. The obtained results provided an intuitive understanding of the distribution law of the seepage field. The evolution law of flow velocity with roughness was analyzed by layer superposition technique. The point of maximum flow velocity corresponded to the point of abrupt change in elevation, which occurred in the region with the greatest fluctuation height of the fracture surface. The accurate description of flow patterns in various rough fractures offers theoretical guidance for seepage in rock fractures in practical engineering applications.