The Stability Factors’ Sensitivity Analysis of Key Rock B and Its Engineering Application of Gob-Side Entry Driving in Fully-Mechanized Caving Faces

To reveal the critical factors of main roof influencing stability surrounding rocks roadways driven along goaf in fully-mechanized top-coal caving faces, this paper builds a structural mechanics model for based on geological conditions 8105 face Yanjiahe Coal Mine, and stress equilibrium key rock block B are analyzed, focus is analyzing rules goaf. Then, orthogonal experiment range method used to confirm sensitivity numerical simulation, which basic height fracture location, length B, hardness turn. It revealed that its location have greater influence god-side entry driving. On one hand, coal wall damaged, deformation vertical narrow pillars tend stabilize with increase height. other when gob-side located below line roof, damage caused by most serious. Therefore, on-site driving should avoid being roof. At last, industrial tests successfully conducted 8215, Mine.