关键词:  , 深井；破碎围岩；变形机理；支护时机；适时注浆

Abstract: To solve the support problem of fractured surrounding rock roadway in deep mine，based on the geological conditions of west track haulage roadway in Xuehu coal mine，we established the mechanical model of roadway floor heave，and studied the failure characteristics and influence factors of the surrounding rock in this paper．The results show that the fractured surrounding rocks around two sides of the roadway have natural pressure relief effect which can delay the formation of floor heave．With the compaction of surrounding rocks in the two sides，the stress continues to transfer toward the floor which then initiates the floor heave．Hereby，the secondary support technology is proposed to control the roadway deformation with fractured surrounding rock in deep mine，that is to say，the U-steel yieldable support is adopt as the first support，while the bolt-grouting and bolt-beam-net-anchor cable support are adopt as the second support．The greatest characteristic of the technique is altered from the lagging grouting to timely grouting，which provides a platform for exerting the anchorage effect of bolt，and the support efficiency is improved greatly．The final support parameters are determined by numerical simulation optimization，and have applied to the field industrial test．The observation results show that the roadway deformation is controlled effectively，and has obtained great social and economic benefits．

Key words:  , deep mine；fractured surrounding rock；deformation mechanism；supporting time；timely grouting