Tunnel blasting hole arrangement structure

The utility model discloses a tunnel blasting hole arrangement structure, include and offered marginal close hole curtain along the even circumference in excavation wheel profile edge of the face thatis blown up, hole groove crowd that semicircle arcuation gathering that marginal close hole curtain formed for drilling formed, seted up outer keyhole of a plurality of and a plurality of inlayer keyhole in the face, outer keyhole and inlayer keyhole all are located the inboard of marginal close hole curtain, outer keyhole and inlayer keyhole be perpendicular face setting all, is equipped with the blown -out shot hole between outer keyhole and the inlayer keyhole, the utility model discloses a two adjacent inlayer keyholes and neighbouring outer keyhole form equilateral triangle's settings ofarranging, and the follow interior and explode outward in proper order for the effect of blasting is better, and the blown -out shot hole site is between inlayer keyhole and outer keyhole, and the produced impact of weakening