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Dokumentowanie geologiczno-inżynierskie osuwisk w aspekcie głębokości występowania powierzchni poślizgu

Kos Jarosław, Wójcik Antoni

Przegląd Geologiczny

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2022

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Vol. 70, nr 9

627--635

EN

When conducting geological and engineering research, the most common statement is information that the landslide is shallow and should not pose a threat to the designed objects. In the case of large, structural landslides, this approach may lead, with the wrong determination of the deepest slip surface, to the occurrence of a construction disaster as a result of improper execution of the protection structure. The article presents specific locations of landslides with deep displacements in inclinometric columns exemplified by landslides monitored as part of the SOPO project in Tarnawa Górna, Słotowa and Międzybrodzie Bialskie - Łazki. The documented slip surfaces are found at depths of 19-42 m. Such deep displacements indicate that large, landslides reach significant thicknesses and such data should be presented in a geological and engineering documentation. It is proposed to modify the regulation on the execution of the geological and engineering documentation by adding a point regarding the documentation of landslides. If such an area exists, special requirements must be met when conducting geological surveys.

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Dokumentowanie geologiczno-inżynierskie osuwisk na terenie fliszu karpackiego

Kos Jarosław, Wójcik Antoni

Przegląd Geologiczny

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2021

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Vol. 69, nr 12

825--834

EN

When conducting geological surveys in landslide areas, it is important to define the scope of the planned geological works. The most important issue in the study of landslides is the recognition of the depth and shape of the slip surface. This requires the correct type of drilling and a good core quality. Most often, within a single landslide, several slip surfaces are documented, which occur at different depths, which is associated with a complex manner of motion and shear. Proper determination of the deepest sliding surfaces allows for the construction of a calculation model and selection of the optimal method of securing the landslide area. The course of the slip surface is often not determined by the depth of the bedrock under the cover formations. Geological diagnosis should depend on the size of the examined landslide and the impact of its activation on potential damage / destruction of existing buildings and technical infrastructure. The method of documenting and carrying out calculations is presented as recommended in landslide areas. In the first step, calculations should be made on the basis of data obtained from field work and parameters obtained from laboratory tests. Monitoring should complement field research and assess the scale of displacements. Conducting stability calculations should be a standard for the preparation of geological and engineering documentation of landslides and areas at risk of mass movements. It allows you to assess the risk and threats to the planned investment or protective structure. This is to provide permanent safeguards to prevent damage to buildings that have been designed on the basis of uncertain geological data. It is postulated to modify the ordinance on the implementation of geological and engineering documentation by adding a point concerning the documentation of landslides. If there is such an area, special requirements must be met when conducting geological surveys.

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Stateczność stoków osuwiskowych na podstawie pomiarów inklinometrycznych oraz właściwości fizyczno-mechaniczne skał i gruntów na przykładzie osuwisk w Ochojnie i Starym Sączu

Kos Jarosław

Przegląd Geologiczny

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2019

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Vol. 67, nr 5

377--387

EN

In the area of landslides in Ochojno and on Stroma street in Stary S¹cz, geological works were carried out, including determination of geological-engineering parameters, and documentation of slip surface on the basis of the drill core analysis. The obtained results allowed the author to construct computational cross-sections on the basis of which slope stability index factors for each of the landslide areas were calculated. These results were compared with the values of stability index obtained from inclinometer measurements. A proposal for documenting landslide areas was presented, paying particular attention to the proper interpretation of the ground profile. This enables avoiding frequent errors made in preparation of geological-engineering documentation based on shallow ground recognition and improperly conducted drilling system.