Studii-geotehnice-privind-autostrada-Brasov–Cluj–Bors-5
Studii-geotehnice-privind-autostrada-Brasov–Cluj–Bors-4
Studii-geotehnice-privind-autostrada-Brasov–Cluj–Bors-3
Studii-geotehnice-privind-autostrada-Brasov–Cluj–Bors-2
Studii-geotehnice-privind-autostrada-Brasov–Cluj–Bors-1
Performed works
The motorway is crossing a hilly area with a maximum level drop of 190 m. The geological fund of the motorway route consists of Paleocene sedimentary deposits belonging to Transylvania Basin, and includes the entire “lower marine series” with the two boundary continental formations. The identified successions are over-consolidated and usually cemented. A significant diluvium-colluvium cover was formed over these deposits, and this cover is prone to be destabilized. From lithological point of view, the motorway crosses a wide range of soil types: clays, marl clays, silty clays, clayish sands, sands, and gravel with sand (ballast), lumachelles of nummulites, sandstones, limestones, conglomerates, and layers of crystalline gypsum. Two exploration campaigns have been developed so as to provide adequate data for designing, and the following results have been recorded:
- Mapping works developed along the entire length of the route within problematic areas, completed with a detailed documentation of outcrops and a drone mapping procedure;
- 102 geotechnical boreholes have been advanced down to 30 m in depth, totalling 1922 linear meters;
- Standard Penetration Tests (SPT);
- Inclinometric and piezometric equipment (vibrating thread sensors) for two geotechnical boreholes (second campaign);
- Laboratory tests: physical properties, shearing strength (UU, CU and CD conditions), compressibility;
- Technical, expert documentation with the geotechnical parameters used to perform stability calculations, as well as recommendations for stabilization solutions
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