Method for rapidly measuring springback value of tunnel primary support sprayed concrete

The invention discloses a method for rapidly measuring the springback value of tunnel primary support sprayed concrete, and the method comprises the following steps: carrying out the absolute position positioning scanning of an original surrounding rock, outputting the point cloud data of the original surrounding rock, importing the point cloud data of the original surrounding rock into BIM software, and building an actual surrounding rock curved surface; initial spraying is conducted on site, and the concrete spraying volume in actual production is recorded as V1; establishing a primary support surface, scanning the primary support surface after spraying is completed, outputting point cloud data of the primary support surface, importing the point cloud data of the primary support surface into BIM software to establish a primary support curved surface, and calculating a space volume V2 generated by superposition of the surrounding rock curved surface and the primary support curved surface; the springback rate