关键词: 巷道支护, 围岩变形, 共同作用, 破碎断层

Abstract: 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.

Key words: Roadway support, Surrounding rock deformation, Combined action, Broken fault