Instability Mode and Control Technology of Surrounding Rock in Composite Roof Coal Roadway under Multiple Dynamic Pressure Disturbances

In view of the problems composite roof coal roadway under multiple dynamic pressure disturbances such as strong stratification, large deformation surrounding rock, and poor safety reliability, this paper analyzed instability characteristics different influencing factors using numerical simulation expounded stress distribution pattern disturbances. The geological conditions gas control in 22301 working face Tunlan mine are taken examples, study is carried out based on analysis roadway. progressive crack development failure mode rock were revealed, mechanism support scheme put forward. According to result, it difficult form a stable bearing beam due occurrence weak interlayer roof. deflection extent plastic zone negatively correlated with distance from soft layer but positively thickness layer. As lateral coefficient λ increases, first decreases then increases. With increasing influence pressure, suffers greater damage superposition high ground stress, abutment advance which characterized by significant zonal asymmetric rock. method high-strength thick id="M2"> anchorage + differential support can construct equivalent side, realizing continuous transfer geometrically coordinated deformation. was finally applied on-site industrial test, monitoring results showed that effectively controlled new scheme.