TUNNEL BLASTING PATTERN AND TUNNEL BLASTING METHOD USING LARGE-CALIBER AND SMALL-CALIBER CHARGE HOLES

摘要

The present invention relates to a tunnel blasting pattern and a tunnel blasting method using large-caliber and small-caliber charge holes. The purpose of the present invention is to reduce a drilling work and construction costs. According to the present invention, the tunnel blasting pattern using large-caliber and small-caliber charge holes comprises: a plurality of auxiliary center blasting holes (10) formed in a center portion of a tunnel; a plurality of center blasting holes symmetrically arranged; a plurality of center blasting expansion holes (30) formed in an upper portion of the auxiliary center blasting hole; a plurality of outer circumference holes (40) formed in a circumference portion of the center blasting expansion hole and the center blasting hole; an out most outer circumference hole (60) formed along a tunnel proposed line; and a plurality of floor holes (70).;COPYRIGHT KIPO 2015