反底拱与砌碹联合支护技术在马城铁矿富水软弱破碎围岩掘进工程中的研究与应用

Study and Application of Combined Support Technology of Inverted Arch and Masonry-lining in Excavation Project of Water-rich Weak and Broken Surrounding Rock in Macheng Iron Mine

马城铁矿属于大水矿山,在矿山建设过程中,随着矿井向深部延伸,巷道围岩的特征复杂多变,尤其当巷道布置在构造应力大、围岩软弱、含有泥化膨胀成分、水害严重等复杂工程环境时,巷道掘进与支护困难。本文分析了马城铁矿3#副井-570 m水平下盘沿脉运输巷(南)376.0~391.0 m掘进段的富水区软弱破碎施工环境,在对工作面冒顶区进行了注浆充填和管棚加固后,为确保施工安全,在地质岩性勘探的基础上,设计采用反底拱与砌碹联合支护技术。通过现场研究与实践表明,反底拱与砌碹联合支护技术针对马城铁矿地质条件是可行的,为马城铁矿富水软岩支护提供了丰富的技术经验。

Macheng Iron Mine is a big water mine.In the process of mine construction,with the extension of the mine to the deep,the characteristics of surrounding rock of roadway are complex and changeable,especially when the roadway is arranged in complex engineering environment such as high horizontal force such as tectonic stress,weak surrounding rock,muddy expansion component and serious water disaster,it is difficult to excavating and lining the roadway.This paper analyzes the weak and broken construction environment in the water-rich area of the 376.0~391.0 m driving section of the-570m horizontal footwall along the vein transport roadway(south)of 3#auxiliary shaft in Macheng Iron Mine.After the goaf area of the working face is reinforced by grouting and filling pipe shed,in order to ensure the construction safety,on the basis of geological and lithological exploration,the combined support technology of inverted arch and masonry-lining was adopted in the design.Through field study and practice,it is shown that the combined support technology of inverted arch and masonry-lining is feasible for the geological conditions of Macheng Iron Mine,which provides rich technical experience for the support technology of water-rich soft rock in Macheng Iron Mine.