Improvement and Realization of Displacement Monitoring Method for Horizontal Foundation Pit Based on Digital Close-range Photography of Foundation Pit

Because the traditional foundation pit monitoring method is a time-consuming,low efficiency and inefficient,it cannot reflect the deformation of foundation pit slope in time.This paper presents a new method for foundation pit monitoring using photogrammetry technology.The method realizes the non-contact measurement,which not only has low work intensity,safety and convenience operation,and high efficiency,but also can quickly acquire the 3D coordinates of any point of any spatial point.The measured data validates the technical feasibility and accuracy of the method.