Abstract: According to the rock burst prevention problem of fully mechanized caving face under deep alluvium in Xinjulong coal mine, field research was conducted to study connected effect between surface subsidence and rock burst. The results show that the starting distance of surface subsidence in fully mechanized caving face under deep alluvium is about 114 m, which is merely 1/7 of the mining depth and much lower than the starting distance of mining depth in general mining conditions. When the surface is in the full-mining stage, an obvious connected effect is observed between the surface subsidence velocity and rock burst. When the surface subsidence velocity increases rapidly, the dynamic pressure manifestation can occur strongly in working face, and the rapid increase of surface subsidence velocity is generally ahead of dynamic pressure manifestation. Based on a comprehensive analysis of seismic and surface subsidence data, a certain correlation is verified between the occurrence of rock burst, surface subsidence and strata movement , which can be used as an auxiliary reference for rock burst pre-warning.

Key words: deep shaft, deep alluvium, thin bedrock, surface subsidence, rock burst, connected effect