Study and application of high stress fractured surrounding rocks support-grouting cooperative control technology
In order to solve the problem of large deformation and strong mineral pressure during excavation and maintenance of the roadway in soft and broken surrounding rock under high stress environment,the 3211 isolated island face mining roadway in Wangpo Coal Mine was taken ad the research background,and the field research was conducted on the on-site geomechanical parameters of the roadway and the deformation condition of surrounding rock,and the causes of deformation and damage of the roadway in this area were analyzed.The syner-gistic control technology of"long and short full anchor cable supporting+deep and shallow hole grouting"was proposed,and industrial tests were carried out in the extended section of the 3211 return bypass.After the on-site industrial test,drilling peephole and continuous rock monitoring were carried out on the surrounding rocks after grouting reinforcement.The results showed that the use of long and short anchor cable layered joint supporting technology could effectively control the deformation of the surrounding rock in this area,the deep and shallow hole grouting reinforcement technology could make the slurry fully fill the fissures to form a stable structure and effectively improve the integrity of the surrounding rock.After the synergistic control,the displacement of the surrounding rock was reduced by 79％compared with that before grouting,which could well improve the stability of the surrounding rock of the roadway.
high stressfractured surrounding rockfull anchor cable supportinggrouting reinforcementsurrounding rock deformation monitoring
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