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1
Content available Stability analysis of the slope subjected to the dynamic loading
Zabuski Lesław
Zeszyty Naukowe. Transport / Politechnika Śląska
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2023
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z. 118
243--255
EN
This paper presents the results of a stability analysis of a slope located in the immediate vicinity of a railway line. The plans for the extension of this railway track include the construction of another line, which would run parallel to the existing one, within a few metres distance. It is expected that intensive goods train traffic will generate both static and dynamic forces in the underlying subsoil. Consequently, seismic vibrations will be generated in the subsoil, propagating mainly not only in the horizontal direction but also in the vertical direction. The method of seismic coefficient of the earthquake intensity determined by a pseudo-static method and horizontal component of acceleration is appropriate and recommended because it is simple, and the safety factor of the slope is calculated in the same way as in conventional stability calculations.
2
Content available Współczesne procesy osuwiskowe na klifie w Jastrzębiej Górze
Zabuski Lesław, Kulczykowski Marek
Przegląd Geologiczny
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2020
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Vol. 68, Nr 9
682--690
EN
The paper describes the geomorphological and geological structure of the cliff Baltic bank in Jastrzębia Góra. The detailed description and analysis of the landslide developed in the selected cross-section of the cliff is provided. Extensive complex investigations involving multiple techniques are described. These methods include the borehole drilling and inspection of the soils composing the slope, laboratory tests of the shear strength parameters by the triaxial compression method, slope stability calculations basing on the finite difference method and inclinometric measurements of the displacements in the borehole performed on the slope. The results prove that the extent of the landslide is limited to the upper part of the slope. The stability factor lower than 1.0 and the continuous displacements measured in the borehole indicate the recent cliff instability. Therefore the works for slope stabilization are strongly recommended.
3
Content available Distinct Element Simulation of a Landslide Process
Zabuski Lesław, Mierczyński Jacek
Archives of Hydro-Engineering and Environmental Mechanics
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2020
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Vol. 67, nr 1-4
3--16
EN
The paper presents a numerical simulation of the development of a catastrophic landslide in a sandstone quarry and methods of reconstructing the quarry to its previous condition from before the landslide. The important objective of the paper is to present the capabilities of the numerical method used in the analysis of the landslide process, namely the Distinct Element Method (DEM). This method is poorly known, though it is capable of solving important geotechnical problems in which massive displacements are modelled. The features of the method are presented on the basis of a case study. Therefore a numerical analysis is carried out to show the performance of DEM in generating a displacement of several dozen meters in the example of a catastrophic landslide that occurred some years ago in a sandstone quarry. This engineering problem makes it possible to describe and analyse the mechanisms, causes and consequences of the landslide.
4
Content available remote Analiza stateczności i stabilizacji zbocza osuwiskowego na trasie linii kolejowej w Świnnej Porębie
Zabuski Lesław, Przewłócki Jarosław
Inżynieria Morska i Geotechnika
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2019
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nr 3
136--142
PL
Wyniki obliczeń stateczności zbocza na odcinku obejmującym trzy osuwiska trasy linii kolejowej, w rejonie zbiornika wodnego w Świnnej Porębie na rzece Skawie. Obliczenia wykonane w układzie płaskim programem FLAC2D opartym na metodzie różnic skończonych. Analiza kilku metod zabezpieczenia zbocza i ocena ich skuteczności.
EN
The results of calculations of slope stability on the section covering three landslides of the railway line, near the water reservoir in Świnna Poręba on the Skawa river. The computations performed in a plane state using the FLAC2D software based on the finite difference method. Analysis of several methods for stabilizing the slope and assessment of their effectiveness.
5
Content available Three-Dimensional Analysis of a Landslide Process on a Slope in Carpathian Flysch
Zabuski Lesław
Archives of Hydro-Engineering and Environmental Mechanics
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2019
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Vol. 66, nr 1-2
27--45
EN
The paper presents a 3D (spatial) analysis of deformation processes in the landslide slope Bystrzyca in Szymbark near Gorlice (Low Beskid – Carpathians; N 49°37′ 09″, E 21°05′ 49″) carried out by the computer code FLAC3D based on the finite difference method. The numerical analysis was performed to determine the influence of the orientation of layers and discontinuities and of hydrogeological conditions on slope deformations and the failure mechanism during sliding processes. The massif is modeled as an elasto-plastic medium obeying the Coulomb-Mohr criterion. Two variants of hydrogeological conditions are analyzed, namely the “dry slope” (without water) and the “wet slope” (entirely saturated). The influence of the orientation of discontinuities (modeled as “ubiquitous”) on the landslide mechanism is investigated as well. Few orientations of discontinuities with respect to the dip direction of the slope surface are considered, namely consequent, insequent, and subsequent (two variants in each case). The results show a clear impact of the pattern of discontinuities and hydrogeological conditions on the deformational behavior of the landslide and the shape of the slip surface. The 3D approach and results of the numerical simulation of the landslide movement prove the necessity of 3D modeling in some cases.
6
Content available Identification of the Causes of a Landslide in Koronowo (Polish Lowlands)
Zabuski Lesław, Kulczykowski Marek, Świdziński Waldemar
Archives of Hydro-Engineering and Environmental Mechanics
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2019
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Vol. 66, nr 1-2
47--56
EN
The paper discusses difficulties of identifying the causes of a landslide. These difficulties are illustrated in the example of a catastrophic landslide on the embankment of the western bank of the Brda River, which affected a bridge abutment of a disused narrow-gauge railway line from Bydgoszcz to Koronowo (Polish Lowlands). The railway was closed in 1992, and after the removal of the track, the bridge served as a pedestrian overpass. The landslide occurred in February 2011. Investigations revealed that the first signs of the landslide were cracks and subsidence that appeared at the embankment crest. Then, an initially slow movement accelerated suddenly, resulting in an over 45 m total displacement of the soil mass. The primary passive cause of the landslide movement resulted from the geology of the mass (loose soils underlain by cohesive soils) and from the steep inclination of the embankment surface. Active causes, however, are often ambiguous. In this case, no significant apparent phenomena which could trigger the movement occurred in the days preceding its initiation. Therefore, a detailed analysis of atmospheric conditions was carried out to identify and explain the causes. It was proved that the fundamental triggering cause of the landslide was a combination of rainfall, snowfall, snow-melting and air temperature. Moreover, an important cause was a faulty construction of a ditch with a sewage pipe on the crest of the embankment.
7
Content available Construction of Pressure Tunnels
Zabuski Lesław
Archives of Hydro-Engineering and Environmental Mechanics
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2019
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Vol. 66, nr 3-4
77--100
EN
The paper focuses on two pressure tunnels in the design of “Katy-Myscowa” water reservoir. One of them serves as a discharge conduit, whereas the other plays an energetic role. Their depths range between 0 and 75 metres and their diameters equal 5 m. Tunnels are located in the rock mass of Carpathian flysch which is anisotropic and heterogeneous, composed of layers of sandstone and clay shales and intersected with interbedding fissures and numerous joints. The paper is divided in two parts. The first part focuses on methods of excavating and supporting, as well as injecting and sealing (i.e. waterproofing) the tunnel. In the second part, a numerical analysis using the FLAC2D code based on the finite difference method was carried for calculating displacements and internal forces in the preliminary support and in permanent lining. Results of the analysis allow for the assessment of conditions in the tunnel during its excavation and exploitation stages.
8
Content available remote Długookresowe zachowanie się tunelu w masywie fliszowym
Zabuski Lesław
Górnictwo i Geoinżynieria
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2003
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R. 27, z. 3--4
641-647
PL
Opisano zachowanie się dwóch tuneli hydrotechnicznych w Świnnej Porębie, na podstawie wyników pomiarów wykonywanych w okresie kilku lat oraz na podstawie wyników analizy numerycznej przy założeniu sprężysto-lepko-plastycznego zachowania się modelowanego ośrodka.
EN
Behaviour of two hydrotechnical tunnels in Świnna Poręba is described, basing on the results of measurements carried out during few years period as well as on the base of numerical analysis in which rock mass was modelled as elasto-viscoplastic material.
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