Blasting excavation method suitable for side wall pilot tunnel posterior hole construction

The invention belongs to the technical field of tunnel blasting excavation, and particularly relates to a blasting excavation method suitable for side wall pilot tunnel posterior hole construction. Comprising the steps of drilling peripheral smooth blasting holes, drilling bottom plate holes, drilling main blasting holes, filling explosives into the peripheral smooth blasting holes, filling the explosives into the bottom plate holes, filling the explosives into the main blasting holes, carrying out early support construction after warning detonation, danger elimination and slag removal operation, and repeating the steps to complete blasting excavation construction of the whole tunnel. According to the method, the position of the main blasting hole is adjusted, the free face of the rear hole is fully utilized, the influence of rear hole blasting construction on the middle partition wall is reduced, the number of the blast holes of the rear hole is reduced, the unit consumption of rear hole blasting is reduced,