Regional distribution structure of mixed hard rock tunnel blasting clinging to existing underground construction objects

The utility model discloses a regional distribution structure of mixed hard rock tunnel blasting clinging to existing underground construction objects in hard rock tunnels. The regional distribution structure is characterized in that a metal expansion blasting area, an emulsion explosive slotting area and an emulsion explosive blasting area are sequentially distributed on a blasting operation surface toward the depth direction and under a structural bottom plate of the existing construction objects. Regional revision is performed, comprehensive damping of mixed hard rock tunnel blasting clinging to the existing underground construction objects is realized, blasting vibration velocity can be ensured to meet requirements and blasting shock wave can be ensured not to cause damage when digging is performed cleaning to the existing underground construction objects in the hard rock layer, and progress of works is guaranteed.