Study on the effect of rock stratum structure on the stability of weakly cemented layered floor and the floor control measures: A case study of Meihuajing Mine

Given the deformation and instability of layered floor weakly cemented soft rock roadway, taking mining roadway Meihuajing Mine as engineering background, mechanism control measures surrounding under different stratum combination conditions are studied by using methods field investigation, numerical calculation test. The results show that: (1) characteristics in roadways significant, structure strata is complex changeable. Under influence disturbance, has a tendency large deformation, especially heave. (2) buckling caused weakening effect, unstable zone, substable zone stable formed successively from shallow to deep. With increase layer thickness, integrity improved, effect reduced, overall stability improved. (3) existence weak interlayer further degrades floor, progressive failure mass more significant effect. (4) relatively hard composite plays an important role controlling playing “local key stratum.” (5) Based on cooperative countermeasure roof–rib–floor rock, support technology roof ribs supported blots mesh beam cable + bolts grouting hardening full section shotcrete proposed. test that scheme greatly improves floor.