Cutting expanding method adjacent to existing railway

The invention provides a cutting expansion method adjacent to an existing railway, which comprises the following steps of: dividing a cutting expansion area positioned at a side slope position of the existing railway into a main blasting area and a reserved protection area along a vertical direction from a direction far away from the existing railway to a direction close to the existing railway according to the excavation width of the cutting expansion area adjacent to the existing railway; blasting excavation is conducted on the main blasting area in a step blasting mode, and after blasting excavation of the main blasting area is completed, a reserved rock wall where the slope surface of the side slope of the existing railway is located is formed in the reserved protection area; and compared with a blasting excavation mode of a main blasting area, the reserved rock wall is excavated in an excavation mode with smaller disturbance. Based on the technical scheme, a blasting excavation mode of the reserved rock