Research on Deformation and Failure Law of the Gob-Side Roadway in Close Extra-Thick Coal Seams

To reveal the deformation and failure law of gob-side roadway (GSR) main influencing factors in close extra-thick coal seams, research methods field monitoring, theoretical analysis, numerical simulation are adopted this paper. Field monitoring data shows that microseismic events occur accumulate frequently surrounding rock some overlying key layers GSR. Large is experienced middle part near solid side, upper parts pillar floor. The strata GSR fractured to form a composite structure as “low-level cantilever beam high-level masonry beam”. squeezed effected by rotation moment M, causing serious bulge side. stability side affected stress transferred from gangue contact point. Numerical immediate roof layer breakage induced mining 30,501 working face. Shear tension failures happen due overburden subsidence rotary extrusion. displacement at on larger than other area. Compared with obviously more fractured, lower bearing capacity. peak up 2 m away roadway, which length bolt support. mining-induced point direct reasons for beside roadway. located 7 where fractures. loads sides Their coupling effect situ horizontal acts force source plastic floor heave.