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The effect of thermal–hydro–mechanical coupling on grouting in a single fracture under coal mine flowing water conditions
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The effect of thermal–hydro–mechanical coupling on grouting in a single fracture under coal mine flowing water conditions
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Journal Article
The effect of thermal–hydro–mechanical coupling on grouting in a single fracture under coal mine flowing water conditions
2025
Overview
Groundwater inrush is a hazard that always occurs during underground mining. Grouting is one of the most effective processes to seal underground water inflow for hazard prevention. In this study, grouting experiments are conducted by using a visualized transparent single‐fracture replica with plane roughness. Image processing and analysis are performed to investigate the thermo–hydro–mechanical coupling effect on the grouting diffusion under coal mine flowing water conditions. The results show that higher ambient temperature leads to shorter initial gel time of chemical grout and leads to a better relative sealing efficiency in the case of a lower flow rate. However, with a higher water flow rate, the relative sealing efficiency is gradually reduced under higher temperature conditions. The grouting pressure, the seepage pressure, and the temperature are measured. The results reveal that the seepage pressure shows a positive correlation with the grouting pressure, while the temperature change shows a negative correlation with the seepage pressure and the grouting pressure. The “equivalent grouting point offset” effect of grouting shows an eccentric elliptical diffusion with larger grouting distance and width under lower temperature conditions. Higher temperature leads to a better relative sealing efficiency with a slow flow rate. Temperature change shows a negative correlation with the seepage pressure and the grouting pressure. The “equivalent grouting point offset” effect of grouting shows an eccentric elliptical propagation. Highlights Higher temperature leads to a better relative sealing efficiency with a slow flow rate. Seepage pressure shows a positive correlation with grouting pressure. Temperature change shows a negative correlation with seepage pressure and grouting pressure. Small breakthrough holes are formed and the diffusion interface is shifted from the center, resulting in the “equivalent grouting point offset” effect.
Publisher
Wiley
