Practice of Advanced Deep Hole Pre-grouting Technology in Structural Area of Large Mining Height Working Face
In the 3105 working face of Shanxi Huoerxinhe Coal Industry Co.,Ltd.,advanced deep hole pre-grouting technology was implemented to address the instability of overlying mudstone layers and abnormal mining height caused by local upward mining.Through seismic exploration and on-site evaluation,7 geological anomaly areas were identified,and precise drilling layout strategies were developed,the techniques of staged drilling and deep hole sealing were applied.Industrial tests showed that a total of 805.12 t of grouting material were used in 154 boreholes,with an average of 5.92 t per hole,successfully reducing the roof caving rate by over 86%,significantly improving the safety and stability of the mine,and proving the effectiveness of this technology in high mining face.
large mining height working facestructural areaadvanced deep holepre-grouting
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