Roof grouting reinforcement technology of gob-side entry retaining with 110 construction method
Under the influence of mining dynamic pressure in the next stage of mining face,it is difficult to control the roof subsidence of roadway with conventional anchor mesh and cable support.Taking the surrounding rock control of gob side en-try in 214202 working face of Hanjiawan Coal Mine as the research object,we analyze the change characteristics of the road-way roof rock structure under the influence of two mining disturbances,propose to stabilize the roadway surrounding rock by grouting before the second mining disturbance,and analyze the measured data of roadway roof subsidence and surrounding rock change before and after reinforcement by using on-site construction measurement technology.The results show that after the grouting reinforcement off gob-size entry,the spalling layer of roadway roof was reduced by 300～400 mm when the entry was affected by the second mining disturbance.Through the grouting reinforcement of the roof,the fractured roof was solidi-fied,thus improving the internal cohesion force and internal friction,enhancing the overall bearing capacity of the roof,and ensuring the safe and efficient mining of the working face.
110 construction methodgob-side entry retaininggrouting reinforcementroadway roofroof-cutting pressure re-lief
万方数据
维普
