Method for identifying and extracting tunnel surrounding rock information based on three-dimensional laser scanning

The invention relates to the technical field of geotechnical engineering, and discloses a tunnel surrounding rock information identification and extraction method based on three-dimensional laser scanning, and the method comprises the following steps: S1, collecting the point cloud original data of tunnel surrounding rock; s2, preprocessing the point cloud original data to obtain point cloud preprocessing data; s3, establishing a tunnel surrounding rock point cloud model according to the point cloud preprocessing data; and S4, according to the tunnel surrounding rock point cloud model, extracting tunnel surrounding rock information by adopting a region growing algorithm based on a half-side structure. The technical problems that in the prior art, after a tunnel is excavated and before supporting, a large number of tunnel surrounding rocks are exposed, so that the arranged surrounding rock detection point positions are damaged, and data collection of the tunnel surrounding rocks and extraction of tunnel surrou