Method for measuring deformation of large-scale tunnel

The invention discloses a method for measuring the deformation of a large-scale tunnel. The method adopts non-contact optical measurement and comprises the following steps of: projecting a plurality of laser mark points serving as measurement datum points to the wall of the tunnel; synchronously acquiring high-resolution digital images of the laser mark points on the wall of the tunnel by using two cameras; calculating three-dimensional data of measured positions through methods of image recognition, machine vision and the like; and detecting the deformation of the tunnel at different times by comparing the measured data of different times. According to the method, the deformation of the tunnel in a three-dimensional space can be accurately measured, and engineering staffs are guided to prevent hidden troubles of the tunnel in advance and reinforce tunnel foundation bodies; moreover, according to the method, measurement can be conveniently and quickly performed, the measured data has high integrity, and the stability and the reliability of deformation data of the tunnel are improved.