关键词: 地下矿山, 主井工程, 变形破坏, 返修加固

Abstract: Considering the deformation failure of surrounding rock of main shaft，the optimal design and construction technology for repair and reinforcement of main shaft was studied.First，detailed investigation for the deformation and failure situation of shaft were finished，the steady situation of main shaft surrounding rock and the factors affecting stability of engineering were showed by investigation and statistical analysis on joint fissures of shaft surrounding rock.Then，considering the engineering characteristics and deformation failure characteristics of different rock segments，many different support schemes were put forward，such as combined bolting and shotcrete net，C60 reinforced concrete，channel steel，U-formed arched falsework，long or short anchor and bolt-grouting etc.At the same time of construction，according to the diverse engineering geological condition of main shaft，the design and process adjustment of supporting and construction technology is optimized.After reinforcement and repair of main shaft，the results show that the engineering keeps stable.It is proved that the repair and reinforcement scheme of main shaft is reasonable and effective.

Key words: Underground mine, Main shaft engineering, Deformation and failure, Repair and reinforcement