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- Title
Shallow geophysical survey as a tool for compactness verification of the underground sealing wall.
- Authors
Putiška, René; Brixová, Bibiana; Bednarik, Martin; Tornyai, Rudolf; Dostál, Ivan; Budinský, Vladimír
- Abstract
The aim of this paper is to assess the compactness of the underground sealing wall through selected geophysical methods as a part of the engineering geological research. Underground wall was realised by grouting concrete mixture through series of two parallel lines of grouting boreholes. The injected environment is represented by the Quaternary sediments, mainly by anthropogenic sediments and soils - weathered rock material of silt composition, clayey sand to clayey gravel with rock fragments up to 10 cm in size, and remains of concrete wall at a depth of 0.3–1 m. Under anthropogenic sediments, granite subsoil rocks were to be interposed by grouting boreholes. Electrical resistivity tomography (ERT), shallow seismic measurements (SRT), and georadar (GPR) were used to verify the compactness of the underground wall. Measurements were made on one profile of a total length of 94 m in the middle between individual grouting boreholes. The measurement results were confronted with geological documentation of boreholes. On one of the boreholes, an electrical resistivity measurement was made on the core sample, which showed that values up to 100 ohm.m represent an injection-free environment and the presence of the injection mixture is displayed by an increase in apparent electrical resistivity. The results of the ERT on the measured profile showed that the individual grouting boreholes behave discreetly, and neither in the vertical nor in the horizontal direction doesn’t form the pre-injected continuous homogeneous layer. Under the groundwater level, the injection mixture did not appear in the electrical resistivity tomography. The mixture was probably washed away in the groundwater flow. The building object was evaluated as non-compact in both horizontal and vertical directions. This result was confirmed also by borehole cores sampling and hydrodynamic testing in boreholes on the assessed section of the staunching wall.
- Subjects
GEOPHYSICAL surveys; ELECTRICAL resistivity; ANTHROPOGENIC soils; DRILL core analysis; GROUNDWATER flow; WALLS
- Publication
Acta Geologica Slovaca, 2021, Vol 13, Issue 2, p199
- ISSN
1338-0044
- Publication type
Article