Failure Mechanism and Stability Control of Soft Roof in Advance Support Section of Mining Face

There is a great risk of roof falls in the advance support section mining face (ASSoMF), and it difficult to control roof. Based on soft Lijiahao coal mine, this paper studies stress distribution ASSoMF space-time evolution surrounding rock plastic zone by using theoretical analysis numerical simulation, reveals its failure mechanism. effect resistance zone, proposed that should mainly adapt roadway deformation. Advance equipment without repeated for mechanized movement has been developed, timing strength check have carried out. Results show at non-uniform field, confining pressure ratio reaches 1.5~7, forms asymmetric failure; principal direction deflects, angle between vertical about 10°~25°, also rotates The can characteristics an unsymmetrical large deformation roof, effectively bear load maintain stability roadway.