Brixová B., Bednarik M., Putiška R., Lahučká J., Budinský V., Prekopová M., Kultan V. & Dostál I., 2022: The resistivity, seismic, geotechnical and geophysical well logging measurements for road cut stability assessment. Acta Geologica Slovaca, 14, 2, 143–151.

The resistivity, seismic, geotechnical and geophysical well logging measurements for road cut stability assessment

Bibiana Brixová¹, Martin Bednarik¹, René Putiška¹, Jana Lahučká², Vladimír Budinský³, Marta Prekopová⁴, Vincent Kultan¹ & Ivan Dostál⁵

¹Department of Engineering Geology, Hydrogeology and Applied Geophysics, Faculty of Natural Sciences, Comenius University in Bratislava, Ilkovičova 6, 842 15 Bratislava, Slovakia
²Department of Environmental Geochemistry, Division of Geology, State Geological Institute of Dionýz Štúr – Bratislava, Mlynská dolina 1, 817 04 Bratislava 11, Slovakia
³Institute of Geosciences, Faculty of Mining, Ecology, Process Control and Geotechnologies, Technical University of Košice, Letná 9, 040 01 Košice, Slovakia
⁴ekolive s. r. o., Americká Trieda 2430/3, Košice, Slovak Republic
⁵AEGEO Ltd., Karpatské námestie 10A, 831 06 Bratislava, Slovakia

Abstract

Regarding to a new highway and expressway networks construction in Slovakia, we are more often solving problems generated with stability state change, whether in natural slopes, cuts, or embankments of road bodies. In the cut of R4 expressway on the section Košice-Milhosť, after repeated anomalous precipitations slope movements leading to stability disruption of the cut were activated. As a part of and supplementary engineering geological survey, 4 inclinometric boreholes were added to the monitoring network. Further, additional laboratory tests on both undisturbed and disturbed samples, focusing primary on determining the shear parameters of the soil were realized, the functionality of the existing subhorizontal drainage elements was evaluated, and the deformations obtained from inclinometry were repeatedly measured and analysed. For the stability assessment, geophysical measurements were designed and carried out – logging measurements in boreholes, electrical resistivity tomography (ERT) and seismic refraction tomography (SRT). The obtained values of seismic velocities of P and S waves were used for the geotechnical parameters – Poisson´s ratio, Shear and Young´s modulus – determination. The stability degree calculated for the current state has a value of 0.97. This indicates an unstable slope and does not correspond with the stability degree required for permanently used structures. The stability calculation also showed the possible further development of slope movements, if the cut was not remediated.

Key words: unknown

Manuscript received: 2022-11-02

Revised version accepted: 2022-12-08