Expressway tunnel deformation detection method and system

The invention provides an expressway tunnel deformation detection method and system, and belongs to the technical field of expressway tunnel deformation detection.The method comprises the steps that tunnel wall face horizontal displacement, tunnel top vertical displacement, tunnel bottom vertical displacement and tunnel wall face convergence degree are obtained; and respectively performing curved surface fitting on the reference points of the tunnel wall surface, the tunnel top and the tunnel bottom and the inclination angle mean values of the reference points of the tunnel wall surface, the tunnel top and the tunnel bottom to obtain a first reference domain, a second reference domain and a third reference domain, and judging whether the tunnel is deformed or not based on the first reference domain, the second reference domain and the third reference domain. According to the method, the deformation condition of the tunnel is considered from multiple dimensions through curved surface fitting, so that the detec