The present invention relates to an open-cut blasting method using six free surfaces capable of increasing blasting efficiency by finally blasting while having six free surfaces after forming the free surfaces by forming horizontal and vertical free surfaces through proceeding blasting. According to the present invention, the open-cut blasting method using six free surfaces comprises: a first step of ensuring a free surface along a lateral direction by blasting laterally inside a blasted material having at least two free surfaces which are a free surface facing the front and a free surface facing an upper part, and ensuring a free surface in a longitudinal direction by blasting in a longitudinal direction in the rear from the front side of the blasted material; a second step of forming a plurality of succeeding parts having six free surfaces by ensuring a free surface by blasting the blasted material having free surfaces formed through the first step along a lateral direction at a predetermined distance; and a third step of completing blasting of the blasted material by blasting the succeeding part having the six free surfaces formed through the second step. In the second step, a blasted material having free surfaces formed through the first step is divided into an extension hole blasting part and a succeeding part with a constant width along a transverse direction, and an extension hole is formed by blasting the extension hole blasting part, thereby a plurality of succeeding parts having six free surfaces are formed. Moreover, in the second step, a blasted material between transverse and longitudinal free surfaces formed through the first step is divided into a plurality in a transverse direction at a predetermined distance, and a free surface is formed by blasting along a dividing line, thereby a plurality of succeeding parts are formed.
展开▼
