Monitoring of the Highway Construction by Hybrid Geodetic Measurements

Abstract

Hybrid surveying measurement application is one of the most demanding deformation analysis tasks in a project of monitoring object. Incorrect resulting positions can lead to incorrect conclusions and thus lead to nasty consequences in the assessing the behavior of an object, which might cause human casualties and material damage.

This paper presents the monitoring of 3D damages caused by landslides, on the highway construction at the section A1 Lašva - Kakanj in Bosnia and Herzegovina. The zero series of measurements was made in May 2015. Since then, six series of measurements have been performed. Geodetic networks of the different types were set at monitored part of highway, such as: micro-triangulation, leveling and GNSS (Global Navigation Satellite Systems) networks, consisting of 60 points, of which 18 represent control points. In order to make the most of the advantages of satellite and classical terrestrial geodetic measurements, i.e. hybrid measurements, a software solution was developed. Determining the common factor variance was a central problem because of the heterogeneity of the measurement vector defined by: horizontal directions, distances, vertical angles, height differences, and GNSS vectors.

Based on the processing of non-homogeneous measurement vectors in different series, the displacements of the geodetic points on the object were determined. However, analyzing of the displacements, deformations were estimated. The standard deviations of the points position along the coordinate axes are <2 mm. Points position accuracy in hybrid networks is up to 40% higher than in the individual classical terrestrial networks.