关键词: 大断面切眼, 迈步掘进, 一次成巷, 主动支护, 围岩控制

Abstract: Abstract: In order to ensure the installation of large mining equipment in fully mechanized mining face, large section cut roadway is needed. However, it is always difficult to solve the problem of how to quickly form and stably support large section cut roadway. The construction technology of one-time roadway formation by step excavation is proposed, that is, the roadway with the first construction width of 4000mm is constructed. After one shift, the remaining 2100mm width from step to the second construction is cycled back and forth, avoiding the cross operation of secondary wall expansion and installation and saving time. The active support parameters of steel belt and steel mesh support on anchor bolt (cable) are adopted to effectively control the deformation of surrounding rock. The maximum subsidence of roof is 130mm and the maximum displacement of two sides is 164mm. In the process of on-site excavation, there has never been a safety accident. The use of this technology improves the excavation efficiency and ensures the safety.