Mechanism of seepage-stress fault water inrush and grouting seal

Abstract

By constructing a coupling analysis numerical model of a Darcy-Forchheimer flow in aquifers, fault zones, and fracture zones after fault water inrush, the variations in porosity, permeability, and volumetric strain under fluid-solid coupling during coal seam mining were studied. The mechanism of fault water inrush was obtained. Grouting was carried out on the aquifer, fault fracture zone, and fracture zone. The mechanisms of flow velocity and pressure evolution in the cross-section during the grouting sealing process were obtained. The simulation results show that the Forchheimer equation can help to effectively simulate and calculate the flow process of current with high water pressure and high flow velocity. There were notable changes in the water pressure partition and porosity after the fault stretch, and the influence of stress-seepage coupling on the non-Darcy flow characteristics in the fault was significant. Through a simulation analysis of grouting at different grouting positions, the change law of flow velocity and pressure in the grouting process was obtained, which is of great significance for selecting appropriate grouting positions and optimizing grouting technology.