Study on the <em>RQD</em> value of the height of the ground grouting section of vertical shaft and its correlation with surrounding rock permeability and grouting volume

Study on the RQD value of the height of the ground grouting section of vertical shaft and its correlation with surrounding rock permeability and grouting volume Journal of Mining and Safety Engineering . 2025, (4): 904 -914 . DOI: 10.13545/j.cnki.jmse.2024.0085