Tunneling method for extrusion blasting of small-included-angle wedge-shaped underholing

The invention relates to a small-included-angle wedge-shaped underholing extrusion blasting tunneling method. The invention discloses a small-included-angle wedge-shaped underholing extrusion blasting tunneling method. The method comprises the steps that (1) a small-included-angle wedge-shaped underholing hole is constructed in the lower position or the upper position of the middle of a mining roadway; (2) auxiliary holes are constructed in the periphery of the small-included-angle wedge-shaped underholing hole; (3) normal rows of shot holes are constructed in the middle-upper position or the middle-lower position of the mining roadway; (4) constructing a top hole or a bottom hole in the mining roadway; (5) the top hole or the bottom hole is filled with an explosive cartridge and a primer detonator, and a hole opening is blocked with stemming; and (6) carrying out millisecond extrusion blasting by utilizing a compensation space between the surface of the mining roadway filling body and the surface of the ore