关键词: 断层, 渗流, Visual Modflow软件, 数值模拟

Abstract: The transportation and distribution of groundwater are affected by the existence of faults. In this article, by applying Visual Modflow, and modeling environment for practical applications in three-dimensional groundwater flow, we build the mathematical model of a conceptual region's groundwater system and research the groundwater seepage under the influence of faults with different dips, strikes and permeability. According to the results made by the identification and analysis with the model, we draw the conclusions as follows: ① Faults with different dips have a different role on the flow field, among the faults with same strikes and other characteristics, vertical fault is the most significant one. ② The impacts of faults on the entire region flow field of faults depend on the angles between the strike and the flow lines of the entire region flow field. The bigger the angle is, the more significant the impact is. ③ Different permeability is also an important factor that affects the distribution of the region flow field. Whatever the fault is considered as a conduit or a barrier, it depends on the differences of the conductivities between fault and protolith. ④ The distance from the fault is also one of the factors that affects the trends of water wells. The closer the distance is, the more obvious the change of water level is. As the distance becomes farther, the impact is not significant. This study will help us to further understand the dynamic effect interaction between fault activity and the migration of underground fluid, and also help us to deepen understanding of the mechanism of precursors during the process of earthquake generation.

Key words: Fault, Seepage, Visual Modflow, Numerical simulation