ABSTRACT
The size of aggregate particle size, the way of pouring, and its accumulation form in the channel are the key factors affecting the cut-off speed and subsequent grouting effect of the mine water inrush channel. In this paper, a visual water inrush channel test platform is built to carry out different particle size aggregate perfusion simulation experiments, and the blocking effect is judged by the aggregate retention rate. The aggregate perfusion methods of ‘fine first and then coarse’ and ‘coarse first and then fine’ are compared with the ‘mixed perfusion’ method, and the law of aggregate accumulation morphology under different methods is summarized. Through the coupling of FLUENT and EDEM software, the test results are further improved by adding feeding ports. The results show that the difference in the aggregate retention rate of different aggregate perfusion methods can reach 18.92%, and the aggregate retention rate of ‘fine first and coarse second’ is the highest. The large difference in aggregate particle size range is not conducive to the rapid formation of water blocking section, the numerical simulation is consistent with the experimental conclusion. Based on the test results, this paper puts forward optimization suggestions for the closure project of a water inrush channel with a high flow rate and a small flow rate.
