A novel approach to measuring ground movements associated with trenchless construction techniques

This paper discusses the application of photogrammetric methods to monitor ground movements during trenchless construction projects. Ground movements are a concern as they can cause damage to buried utilities and surface structures. Photogrammetry is a remote sensing technique in which the geometric properties of objects and surfaces can be determined from photographic images. This technique allows for accurate three-dimensional measurements of specific points on the ground surface. Measurements are determined utilizing two or more photographs taken from different positions at specific time intervals. Photographs from specific time intervals are complied using photogrammetry software to determine the position of surface points in three-dimensional space. This paper provides an overview of the photogrammetric method, its application to trenchless projects, and results and analysis of data gathered from calibration and repeatability of measurement studies.