Mechanics calculation on beam-arch compound structure of roof anchoring

Through similar model test and theoretical analysis, the beam-arch compound structure was put forward based on the theory on anchorage body strengthening and the theory on arch. In view of compound structure´s characteristic of bearing capacity and self-supporting ability, the anchoring parameters were determined according to the structure´s stability. According to Coulomb criterion, the roof bolt length was decided based on the anchored beam´s shear failure. The side blot length was determined according to the arch foot position into the roadway wall. The bolt space was chosen according to the relation between the bolt´s length and anchoring superposition area. The anchored cable length was determined according to the arch height. The conclusions were applied to the anchorage supporting of Laoshidan Coal Mine´s rectangle section roadway.