关键词: 特大断面开切眼, 支护参数优化, 分次掘进, 联合支护, 矿压监测

Abstract: As more and more 5~7 m coal seam adopting gradually coal mining with all height at one time, the technology of large-section open-off cut is gradually adopted.So the study of large-section open-off cut supporting and driving technology is the key of the implementation of this technology.According to the specific geological characteristics of large-section open-off cut on the working face of Luan group coal mine, a support scheme using the bolt-steel mesh-anchor combined support was proposed.With the three-dimensional numerical calculation method, the rational supporting parameters are determined.In order to verify the rationality of supporting scheme, the actual monitoring was conducted.The results show that the supporting scheme is reasonable and reliable.It can fully meet the need of safe production, and it also provides reference for the similar conditions

Key words: .Large-section open-off cut, Support parameter optimization, Secondary tunneling, Combined support, The rock pressure monitoring