Abstract: Aiming at advancing the automatic detection and health assessment technology for the tunnel lining, nonvisual highspeed photogrammetry and microtremor measurement technology are introduced on the basis of the nondestructive detection technology of tunnellining diseases. The nonvisual highspeed photogrammetry technology can automatically identify and extract the lining surface defect with a highcrack width resolution of 0.2 mm under a detection driving velocity of 100 km/h, whereas, the microtremor measurement technology can automatically detect the inner abnormal points (including cracks and cavities) of a tunnel lining. The measurement equipments are characterized by miniaturization, strong antiinterference, high resolution, and nonextra exciting power requirements. Moreover, the fractal dimension and averaged synthetic spectrum resultant average spectrum of a microtremor are proposed, and combining with the tunnellining crack index, the quantitative assessment of a health condition can be provided. These three indices can comprehensively represent the characteristics of width, length, crack direction, number, and the distribution of cracks and inner abnormal points of a tunnel lining, determining the damaged lining section with high accuracy.

Key words: tunnel, lining disease, automatic detection, nonvisual high , speed photogrammetry technology, microtremor measurement technology, health assessment