Study On The Strata Behavior Law And Collaborative Control Of Eob-side Entry Retaining Of Deep Backiflling With Large Mining Height

For the complicated environment of gob-side entry retaining in deep backfilling,this paper studies the collaborative control of surrounding rock in complex conditions.The main study content is as follows: study relationship between mechnical features ofhigh-water material with different ratio and strata behavior. The higher water fillingmaterial is determined to weaken the impact caused by the dynamic load to thegob-side entry retaining surrounding rock stability. The abutment pressure distributionlaw of mining stope and the different impace caused by different filling length to thesurrounding abutment pressure distribution are studied by using numerical simulation.This paper builds the structure mechanic model of gob-side entry retaining surroundingrock stability in collaborative support condition including non-uniformed loaded fillingbody and road-side brackets. Keeping stability and compensate effect produced byroad-side support to filling body in onverlying strata movement process is researched.Coal-side weak mechanical model of gob-side entry retaining is built. The effect fromweak structure failure process to roof stability is analyzed. The collaborative controlmechanism and technique system consist of changed filling body, steel concrete pipes,high prestress and strength, and truss cable is proposed, which promotes thedevelopment of deep roadway surrounding rock control technology.