Abstract:

Aiming at the roof collapse problem of the coal roadway with compound mudstone strata in the period of the roadway excavation or working face mining, firstly, the roadway is classified in combination with thickness value of the compound mudstone and concrete location in the roof strata. On the basis of the above classification results, a mechanical model is built, which is used to obtain the source of the large roof deformation or the roof caving to this type of roadway, and then a combining controlling technology including bolt, cable and cable truss support with high pre-tightening force is proposed. Finally, this type of support technology is applied to the field roadway and the trial results show that the roof deformation is controlled effectively and ensure the supported roof stability.