Abstract: At present, the deformation monitoring of deep foundation pit support is becoming more and more important. The traditional appearance deformation monitoring instruments of foundation pit support mainly use level, total station and other equipment, with low efficiency and automation. Close-range photogrammetry technology has the characteristics of non-contact, low cost and three-dimensional property, but its deformation monitoring accuracy is not high, which restricts its further promotion and use. Aiming at the problem of close-range photogrammetry and combined with the characteristics of foundation pit support deformation, this paper puts forward a deformation monitoring method of foundation pit support based on close-range photogrammetry with two-dimensional images, and conducts analysis from the aspects of camera checking, photography logo design, lighting conditions, photographing parameters setting and error analysis of data processing system. The results indicate that, the error of deformation monitoring is less than 0.1 mm with a distance of 20 m and a focal length of 50 mm. This result can provide reference for the application of close-range photogrammetry in the foundation pit support deformation monitoring.
Keywords: foundation pit support deformation monitoring; object surface resolution; direction correction; light condition; system error
合肥工业大学学报自科版