Abstract:Kekegai Coal Mine, located in northern Yuheng mining area and on the southern fringe of the Mu Us Desert, introduced drilling method in vertical shaft construction for the first time in the north of the Yellow River. The pilot hole of the shaft reveals that the Quaternary drift-sand formation is up to 61m thick. To ensure safe and smooth construction of the shaft and avoid borehole collapse, freezing method or deep-hole pre-grouting method is generally used, while in this project, the MJS jet grouting method was creatively adopted in the shaft construction, achieving the goal of fast reinforcement of the unconsolidated formation, guaranteeing the construction safety and obtaining good safety and technical effects. The innovative practice has also provided reference for eliminating the hidden danger of collapse in shaft construction using drilling method in Mu Us Desert area. Meanwhile, coal mine construction is an integration of multiple technologies, thus, the latest scientific and technological achievements at home and abroad shall be combined or learned to drive the technological progress of the industry. This practice is a model of cross-industry technical cooperation, it has provided ideas to those safety and technical management personnel committed to coal mine construction for solving the technical difficulties they encountered.
