基于MSJ工法立井钻井过深厚流沙层的应用研究

Research on the Application of MSJ in the Shafts Across Deep Thick Drift-sand Formation

可可盖煤矿位于陕西榆横矿区北区,处于毛乌素沙漠南缘,在我国黄河以北地区首次引进钻井法施工立井井筒。井筒检查孔揭露第四系流砂层达61 m,为保证井孔安全顺利施工,避免塌孔事故发生,常规处理工法一般采用冻结法或深孔预注浆,本工程创造性地将土建施工中的MJS高压旋喷桩地基处理技术应用到井筒施工中的第四系松散层加固治理中,达到了快速加固流砂层的目的,保证了井孔施工安全,取得了良好的安全技术效果,也为陕北地处毛乌素沙漠的矿井建设采用钻井法施工立井消除松散层塌孔隐患提供了参考;同时,煤矿建设工程是一项综合技术,应结合或借鉴国内外最新科技发展成果来推动本行业技术进步。本工程实践提供了跨界技术合作的成功范例,为广大从事煤矿建设的安全技术管理人员解决本专业遇到的技术难题拓展了思路。

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 61 m 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.