超深废石堆积层竖井井颈结构型式探讨

Discussion on the Structural Type of Shaft Collar in Ultra-deep Waste Rock Accumulations

国内某铁矿通风井受地形地貌、征地费用等实际建设条件的限制,井位被迫设置在废石堆积层内,这种不稳定的复杂地层给通风井井颈设计和施工均带来了极大的挑战。基于该井颈的工程地质和水文地质条件,分析了该通风井井颈设计和施工方面的难点。结合拟采用的新施工技术,对井颈的结构型式进行分析研究。按松散体理论确定井壁厚度后,利用地基承载能力理论,对壁座道数进行了计算,确定了井颈结构型式。针对该井颈地质条件的复杂性,对施工提出了一些建议,为施工组织编制提供参考。应用表明该通风井井颈结构设计合理可靠,实现了同现场条件及施工技术方案的紧密结合,为井颈段顺利施工提供了保证,对在类似围岩条件下进行竖井井颈设计和施工具有一定的借鉴意义和参考价值。

Subject to topography, land acquisition costs and other actual construction conditions, the ventilation shaft of an iron ore mine in China has to be positioned in waste rock accumulations. This unstable and complex stratum poses great challenge to the design and construction of the ventilation shaft collar. Based on engineering geological and hydrogeological conditions at the shaft collar, analysis was made on the difficulties in the design and construction of the shaft collar. Research on the structural type of the shaft collar was carried out by combining the proposed new construction technology. After the shaft wall thickness was confirmed according to the loose body theory, the foundation bearing capacity theory was applied to calculate the number of shaft cribs and determine the structural type of the shaft collar. Considering the complex geological conditions at the shaft collar, some construction suggestions were proposed to provide reference for the preparation of construction organization. The application indicates that the structural design of the ventilation shaft collar is reasonable, reliable and in close combination with site conditions and construction technical scheme, which has provided guarantee for the smooth construction of the shaft collar section, and has certain referential significance for the design and construction of shaft collar under similar wall rock conditions.