大红山铁矿二道河矿段225 m回风平巷钢拱架超前管棚锚杆支护工艺

大红山铁矿二道河矿段225 m回风平巷掘进支护工程在3 a多时间内前后作出了3次支护施工方案变更，由于地质条件的特殊性以及前2次支护方案的缺陷，给施工带来较大安全风险。为了保证该段掘进支护工程安全顺利通过，对比分析前2次的支护方案，确定了采用钢拱架超前管棚锚杆支护。根据围岩与支护共同作用原理和现场实际巷道支护的难易程度，调整了各项支护参数，做到了从掘进后的混泥土浇筑或槽钢支架被动消极支护到掘进前的拱架超前管棚锚杆支护主动积极支护的转变，有效控制了围岩变形。该支护工艺实施后，保证了巷道掘进施工安全，加快了施工进度，顺利地通过了破碎断层带。此支护工艺可供同类工程施工作为参考。

Supporting Technology of Steel Arch Frame Leading Pipe Roof and Bolt in 225 m Return Roadway of Erdaohe Section of Dahongshan Iron Mine

The 225 m return airway excavation support project of the Erdaohe Mine Section of Dahongshan Iron Mine made three changes to the construction plan within 3 years.The particularity of the conditions and the defects of the previous two support schemes pose a greater safety risk to the construction.In order to ensure the safe and smooth passage of the excavation and support engineering,the first two support schemes were compared and analyzed,and the steel arched arch bolster support was determined.According to the principle of the interaction between surrounding rock and support and the difficulty of adjustment of the actual roadway support,the support is carried out from the concrete pouring after the excavation or the passive support of the channel steel bracket to the excavation before the excavation The transformation of the active support of the arched shack bolt support supports the deformation of the surrounding rock.After the implementation of the support technology,the roadway construction safety was ensured,the construction progress was accelerated,and the broken fault zone was smoothly passed.This support technology can be used as a reference for similar engineering construction.