In view of the problems of large rock burst risk and high difficulty of surrounding rock control in coal seam mining roadway passing through the structure zone,a comprehensive method of pressure relief+advance reinforcement is proposed to ensure the safety of roadway excavation,and the engineering application is carried out in 11303 transport lane.According to the production plan,the roof of 11301 fully-mechanized mining face was weakened by hydraulic pressure relief during the mining of geological structure belt,and the stress concentration of surrounding rock of 11303 transport lane was reduced.Before passing through the geological structure belt,the transport lane 11303 is relieved through large-diameter drilling hole and floor pressure relief trough.At the same time,the broken sur-rounding rock is reinforced by advance grouting when passing through the structure belt,so as to reduce the impact of roof fall and sur-rounding rock instability caused by vibration and shock.After engineering application,the surrounding rock of 11303 transportation lane remained stable and the deformation of the roadway was small during the period when it was driven through the geological structure belt,indicating that the technical measures of pressure relief and reinforcement used on site were effective.
关键词
冲击地压/巷道掘进/地质构造/卸压/注浆加固
Key words
rock burst/roadway driving/geological structure/pressure relief/grouting reinforcement
维普
万方数据