Geophysical research through electrical tomography method for highlighting a channel for rainwater collection situated under a future highway. For this research three measuring devices were used – Schlumberger, Wenner and dipole-dipole. The results are very convincing and confirm the effectiveness of using geoelectrical devices for identifying underground utilities and the specific geological characteristics of the investigated site.
Geoelectrical tomography for identifying local geological and hydrogeological conditions that favored the occurrence of landslides that endanger stability of future works developed in the research area. Geoelectrical sections helped to identify the characteristics of sliding plan and establish measures to stabilize the land. The work involved exploring through cross and longitudinal sections of a line of over 8 km of highway with high traffic areas. In these circumstances it was necessary to execute certain profiles at night to avoid disrupting works in progress and traffic.
Geoelectrical investigations to identify and characterize local geological conditions found in the area of undercrossing the Danube through horizontal directional drillings. The geoelectrical measurements were performed on water using cables and devices specially designed for this kind of work. Taking into account the Danube’s characteristics in the research area – width of 500 m, flow speed, intense sailing – the geoelectrical measurements were performed in Vertical Electrical Sounding (VES) method using two boats. Locating the exact position of VES was performed with a RTK GPS with high precision and water depth was measured using an Ohmex sonar. The results of these investigations have resulted in an interpretive geological section necessary for designing the future horizontal directional drillings.
Bathymetric measurements for drawing a bathymetric map of a Danube sector between Comasca (Romania) and Marten (Bulgaria). As required, measurements were made on alignments predefined by using Ohmex equipment and GPS GNSS. The compensation of topographic data was done with connection to the network ROMPOS.
Measurements of the variation of vertical magnetic gradient in order to identify metal objects hidden (buried or submerged) on the alignment of the horizontal directional drilling that undercrosses the Danube between Romania and Bulgaria. For the absolute positioning of measurements, a GPS Stonex GNSS equipment with high precision was used. The measuring equipment was magnetically isolated from the rest of the boat so that there would be no influence caused by boat.
Georadar investigations (GPR) in order to identify elements of the sewerage system within the military airport at Deveselu, Romania. The works consisted in the detection and marking of the items of research directly on the location. In this respect it was necessary to calibrate the equipment in order to answer these requirements as well as possible. The results confirmed the existence of underground sewerage network elements.
Geoelectrical investigations through Vertical Electrical Sounding (VES) method and electrical tomography (multielectrod) to identify the local geological conditions that led to landslides near the village Aciliu, Sibiu County. At the same time with the geophysical studies, geotechnical investigations with dynamic penetration were carried out. The results of these studies were very accurate and longitudinal and cross sections that separate the slip plane have resulted.
Georadar investigation (GPR) and natural magnetic field were carried out to identify buried utility networks. The land under investigation is a former industrial platform with good chance that the utilities are active or abandoned. The land area consisted of boulders and debris making georadar measurements difficult in optimal conditions. In these circumstances further investigations were made through the natural magnetic field method.
Georadar investigations (GPR) at Baneasa airport to identify current conditions of the runway and of the aircraft parking platform. In this project a georadar antenna with 900 MHz frequency was used, which highlighted the layers, discontinuities, fissures and utilities in very good conditions. Because of airport conditions, the works were conducted at night, when air traffic was interrupted. The positioning of profiles on existing plans was realized with GPS technology with ROMPOS network link.
Geophysical investigations through geoelectrical methods in direct current (DC) – Vertical Electrical Soundings (VES) and multielectrod (electrical tomography) to identify local geological and hydrogeological conditions in river crossing of river Gauja, Latvia. The interpretation of the geoelectrical sections corroborated with the geological information resulted from the drillings have allowed the development of geological sections that support the design of horizontal directional drilling safely