Water Erosion and Extension of Ground Fissures in Weihe Basin Based on DEM-CFD Coupled Modeling

The Weihe Basin is one of the regions with highest concentrations ground fissure development and most serious disasters in China. Hidden fissures are formed shallow soil layer due to preexisting generated by tectonism, hidden suddenly exposed surface after heavy rainfall. Because details water erosion process cannot be replicated geological survey methods, extension mechanism has not fully developed discontinuous medium numerical simulation method well suited for simulating large deformations facilitates a microscopic perspective elucidating underlying causal mechanisms. This paper deploys discrete element (DEM)–computational fluid dynamics (CFD) fluid–solid coupled modeling growth containing different types (sand clay) under rainfall, revealing into fissures. findings include: (1) emergence rainfall can summarized four stages: subsurface holes, traction arches, collapse sinkholes, horizontal extension; (2) clay slower than that sand constraint cohesion; (3) shape bottom seepage point affects process, which an important factor macroscopic performance intuitive reproducible DEM-CFD used this possesses reference value study prevention