Abstract
During road construction investments, the key issue affecting the structure’s safety is accurate subsoil recognition. Identifying subsoil variability zones or natural voids can be performed using geophysical methods, and ground-penetrating radar (GPR) is recommended for this task as it identifies the location and spatial range karst formations. This paper describes the methodology of acquisition and processing of GPR data for ground recognition for road investment. Additional subsoil research was performed after karst phenomena were identified in the investment area, formations not revealed by geological recognition from earlier studies during the pre-design stage. Mala Ramac CU II radar with a 250 MHz antenna and a Leica DS2000 with 250 and 700 MHz antennas with real-time geopositioning were used to obtain the data. Regarding GPR data postprocessing, we present a method of converting spatial visualization into a point cloud that allows for GPR and geodetic data integration and confrontation. This approach enabled us to determine the locations of control trenches, the results of which were used for material validation, which is necessary to improve the reliability of subsoil recognition. The results showed a high correlation between the recorded GPR signals and the subsoil structure. Additionally, differences in the quality of results for measurements conducted before laying supporting layers with slag and on the completed road structure surface are illustrated.
Highlights
Accepted: 22 September 2021The proper recognition of foundation soil is essential for designing construction investments, both cubature and infrastructure
Regarding ground-penetrating radar (GPR) data postprocessing, we present a method of converting spatial visualization into a point cloud that allows for GPR and geodetic data integration and confrontation
This approach enabled us to determine the locations of control trenches, the results of which were used for material validation, which is necessary to improve the reliability of subsoil recognition
Summary
The proper recognition of foundation soil is essential for designing construction investments, both cubature and infrastructure. It increases safety and reduces additional costs at the realization stage and during the exploitation of engineering structures. One of the tools supporting ground recognition is a geophysical survey, which, among other things, recognizes the tectonic structure of the layers during sulfur extraction [1], landslide monitoring in the infrastructure areas [2] and tectonic movements [3]. Several research projects have been conducted on the geometrization of changes to the ground-based on. This is important for ground reinforcement design, stability assessment and soil replacement. In 2015, the Polish General Directorate for National Roads and Motorways (GDDKiA), together with the National Center for Research and Development (NCBiR), under the joint undertaking “Development of Road
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