This paper presents a high-precision 3D method for non-contact measurement of the deformation of rock surrounding a tunnel. The method uses a 2D high-resolution photograph taken with a monocular camera and a 3D reconstruction technique to obtain a 3D image of rocks surrounding a tunnel. First, we analyze the basic principles of 3D-image-reconstruction technology. Next, we discuss methods for calculating the 3D shape of the known and unknown 2D key points and conclude that the use of deep convolutional neural network is an effective method and a new idea. Finally, we present findings that demonstrate that the 3D reconstruction method proposed in this paper can be used to obtain tri-dimensional models and deformation variables for the rock surrounding a tunnel that are superior to results obtained using traditional methods. The method is simple, provides good visibility, has a high degree of accuracy, and does not affect the physical structure of the tunnel.

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