Study on correlation between spatial fracturing of overlying strata and distribution of mining stress field in stope

Aiming at the problem that the elastic strain energy in the concentrated static load zone and fracturing shock of the overlying hard rock group is easily coupling to induce rockburst,method of on-site monitoring and statistical analysis is used to explore the overlying strata spatial fracturing law and the distribution characteristics of mining stress field.The correlation on both things to influencing rockbust is monitored and analyzed. Based on the research results, the advance support pattern of gob-side roadway was improved and verified in practice.This study showed that the severe overburden fracture zone in the No.31102 working face of Nalinhe No.2 Coal Mine is in the fine sandstone layer,30.3 m above the 3-1 coal roof and 14.85 m in thickness, and is ahead of the working face by 30～40 m.The influence of the lead bearing pressure is 254～280 m in front of the working face,and the peak point is less than 66 m from the working face.The result also shows that rockburst is likely to occur when the high stress zone is close to the severe overburden fracture zone.The raft type hydraulic supports were applied in gob-side roadway,ahead of the working face in 0～40 m and under the severe overburden fracture zone.Practice showed that it plays a key role in the process of rock burst control.