TUNNEL EXCAVATION METHOD USING FREE SURFACE AND TUNNEL EXCAVATION DEVICE FOR FORMATION OF FREE SURFACE

摘要

The present invention relates to a tunnel excavation method using a free surface and a tunnel excavation apparatus for forming a free surface. It relates to a tunnel excavation method using a free surface and a tunnel excavation apparatus for forming a free surface. To this end, the tunnel excavation method using a free surface according to the present invention comprises the steps of forming a free surface while drilling along a virtual excavation line, and excavating after blasting the space to be excavated surrounded by the free surface, the The forming of the free surface includes dividing the virtual excavation vessel into n unit areas (n is an integer greater than or equal to 2), and drilling so that the free surface is simultaneously formed in the unit area.