Study on Key Parameters of Automatic Roadway Formation Without Pillar by Roof Cutting Based on Floor Failure

ABSTRACT

Floor water inrush threatens the safe mining of the mine. The automatic roadway formation without pillar by roof cutting (ARFPRC) method can reduce the floor water inrush risk. However, the key parameters for mining above confined aquifers are difficult to determine. In response, this study proposes a design method for determining the key parameters of ARFPRC based on floor failure. First, the unique advantages of ARFPRC in reducing floor water inrush risk is elucidated. Then, numerical simulation studies are conducted to analyze the characteristics of floor damage under different roof cutting parameters, leading to the determination of the optimal parameters. It is also clarified that grouting reinforcement to improve rock properties is beneficial for preventing water inrush. Subsequently, a field test of floor grouting reinforcement was conducted on site. After its effectiveness was confirmed through geophysical detection, the ARFPRC industrial test was carried out. Finally, based on the measured depth of floor failure, it was demonstrated that the designed parameters effectively controlled floor damage. The research findings provide a theoretical foundation and engineering guidance for the application of ARFPRC technology in mining areas with the risk of floor water inrush.