Development of Simulation Test System for the Migration of Slurry in the Horizontal Grouting Hole of the Fault Fracture Zone

Water inrush from coal seam floor is often caused by exposing the fault fracture zone in mining activities. The advance grouting by the horizontal directional drilling is a effective to reinforce the fault. Therefore, the primary problem at the current stage is how to scientifically and effectively study the movement law of grouting in the horizontal hole slurry in the fault fracture zone. Given the above issues, this paper develops and designs a variable inclination visual three-dimensional test system for the migration simulation of horizontal grouting hole in a fault fracture zone. The system consists of four parts: the simulation system of fault fracture zone, the grouting simulation system, the confined groundwater simulation system, and the data acquisition and measurement system. It can realize the simulation test of grouting slurry migration affected by different drilling spacing and combination, grouting pressure, hydrostatic pressure, fault medium type and inclination, grouting material, slurry water-cement ratio, and other factors. The experimental results show that the system is stable and reliable and can carry out empirical simulation research on the migration of horizontal hole grouting in fault fracture zone with different relevant parameters. It provides an essential experimental research platform for revealing the fault fracture zone's horizontal hole grouting migration law.