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Wyświetlanie 1-5 z 5
Tytuł:
Analiza przyczyn katastrofy budowlanej na Zamku Książąt Pomorskich w Szczecinie w świetle dotychczasowych ustaleń
Analysis of the causes of the construction disaster in Pomeranian Dukes Castle in Szczecin - current state of investigation
Autorzy:
Tarnawski, Marek
Godlewski, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/2076161.pdf
Data publikacji:
2021
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
badanie gleby
stan geologiczny
badania geofizyczne
konstrukcje podziemne
obiekty zabytkowe
soil investigation
geological condition
geophysics research
underground constructions
historic objects
Opis:
The Renaissance Pomeranian Dukes'Castle in Szczecin was built in the late 16th century in place of older buildings. At that time, the construction, and in particular the foundation of buildings on non-diagenized sediments, was more of an art than a science, since soil mechanics was being born only in the 18thand 19th centuries. However, the experience and intuition of old building masters also allowed for the construction of monumental structures that could survive hundreds or thousands of years. Their walls looked solid, so there was no fear of making further renovations and rebuilding in the following centuries. Meanwhile, in 2017, the complex of columns supporting the ceilings of the three-story rooms and the basement in the northern wing of the castle collapsed underground. It happened around 430 years after the completion of construction. The article discusses the results of various types of geotechnical tests, the purpose of which was to determine the causes of the catastrophe. Thanks to the research, a complex of underground tunnels made mostly during World War II, but also previously suspected, was discovered and largely documented. The article summarizes the actual arrangements and describes geological and historical conditions regarding the course and causes of the Castle's construction disaster in Szczecin. The knowledge resulting from these studies and analyses makes us approach with great caution any interference in the existing static system of seemingly powerful and indestructible historic buildings.
Źródło:
Przegląd Geologiczny; 2021, 69, 12; 884--898
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ancient and modern anastomosing rivers: insights from sedimentological and geomorphological case studies of the Triassic, Neogene and Holocene of Poland
Autorzy:
Kędzior, Artur
Widera, Marek
Zieliński, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/2058684.pdf
Data publikacji:
2021
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
fluvial environment
facies analysis
river type
tectonics
climate
Polska
Opis:
We review the three regional anastomosing fluvial systems, both ancient and modern. The dinosaur-bearing upper Triassic succession in Krasiejów (S Poland) is composed of siltstones and claystones that are divided into three facies associations. One of the fluvial associations is characterized by features typical of a low-energy anastomosing river system in a tropical semiarid climate, interpreted as the result of accumulation in deep, wide and low-sinuosity palaeochannels with pronounced vertical accretion. Deposition from suspension predominated in flows of very low stream power. The upper Neogene muddy succession in a tectonically active area (Kleczew Graben, central Poland) includes a great number of fluvial palaeochannels filled with sand and/or mud. These ribbon-shaped fluvial bodies are deep and wide, and represent channels showing very lim ited lateral migration. They were filled mostly under low-energy condi tions, and their mapped course shows an “anabranching” pattern in plan view. The palaeochannels are transitional from sand- to mud-dominated. The Holocene upper Narew River (NE Poland) represents a modern anastomosing fluvial system. The interconnected channels form an anabranching pattern. The channels are straight to slightly sinuous, relatively deep and wide. Interchannel, low-lying “islands” are covered by peat-forming plants. Despite the low stream power, in-channel deposition is dominated by sand transported as bedload. The channel banks are stabilised by vegetation, which effectively prevents their lateral migration.
Źródło:
Geological Quarterly; 2021, 65, 4; 111--138
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microhardness analysis of halite from different salt-bearing formations
Autorzy:
Toboła, Tomasz Tadeusz
Cyran, Katarzyna
Rembiś, Marek
Powiązania:
https://bibliotekanauki.pl/articles/2058643.pdf
Data publikacji:
2019
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
microhardness
halite
salt formation
crystal defects
dislocations
shape of imprins
Opis:
Microhardness tests were carried out on single halite crystals. They were conducted on the (001) surface, with the indenter set in two directions: parallel to the halite face (010); and parallel to the (110) face. The halite crystals represent salt formations of different ages (Devonian, Zechstein, Badenian), depths (from 1835.5 to 195 m) and intensities of tectonic disturbance (horizontally stratified, salt dome, strongly folded). The measurement results revealed specific features of the halite crystals analysed. Firstly, the data obtained show microhardness anisotropy in halite crystals. Moreover, microhardness correlates with the depth of the salt-bearing formations. Halite crystals from deeper levels showed higher microhardness, though there was no correlation between the intensity of tectonic deformation and the average Vickers hardness (HV). The samples analysed show a variability of HV values and and of the shapes of imprints. These indicate zones where halite crystals are deformed at the atomic level and reflects the presence of defects in the crystal lattice. Such deformation is reflected in an irregularity of the strike of cleavage planes. Consequently, the analysis of imprint shapes is a useful method for the examination of ductile minerals and materials.
Źródło:
Geological Quarterly; 2019, 63, 4; 771--785
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Seismically-induced soft-sediment deformation in crevasse-splay microdelta deposits (Middle Miocene, central Poland)
Autorzy:
Chomiak, Lilianna
Maciaszek, Piotr
Wachocki, Robert
Widera, Marek
Zieliński, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/2058612.pdf
Data publikacji:
2019
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
backswamp area
SSDS
ductile and brittle deformations
earthquakes
seismites
Opis:
Crevasse-splay microdelta deposits and their soft-sediment deformation structures (SSDS) are described from a tectonically active lignite-bearing area. These strongly deformed siliciclastic deposits, situated between two lignite benches, are typical of a crevasse-splay microdelta. They accumulated in the overbank zone of a Middle Miocene river system (backswamp area) where shallow ponds or lakes occasionally existed. The deformation takes the form of deformed lamination and load (load casts and flame structures) structures as well as seismic breccias within the first Mid-Polish lignite seam. Ductile deformation structures were generated first by liquefaction and then the breccia was formed under brittle conditions. The brecciation followed a sudden tectonic collapse resulting in an increase in pore pressure related to upward water movement. The occurrence in a tectonic graben and characteristic morphological features suggest an origin of these deformational structures with seismic shocks; thus, they can be called seismites. Hence, we provide strong evidence for accumulation of crevasse-splay sediments in the standing water of a backswamp area, and for tectonic activity in central Poland as the Middle Miocene lignite accumulated.
Źródło:
Geological Quarterly; 2019, 63, 1; 162--177
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Seismically induced soft-sediment deformation in crevasse-splay microdelta deposits (Middle Miocene, central Poland) – reply
Autorzy:
Chomiak, Lilianna
Maciaszek, Piotr
Wachocki, Robert
Widera, Marek
Zieliński, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/2058658.pdf
Data publikacji:
2019
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
tectonic graben
lignite seam
SSDS
domino structures
tectonics
seismics
Opis:
We expected that our paper on the crevasse-splay microdelta (Chomiak et al., 2019) would arouse the interest of other researchers for at least two reasons. First, this is the first such palaeoform discovered and described within the Mid-Miocene lignite seam in Poland. Second, the microdelta siliciclastic deposits are strongly deformed both ductile and brittle. Therefore, we would like to thank Tom van Loon for his effort to comment on our article, including his words of appreciation, and above all, for pointing out some of the terminological and interpretative shortcomings. Our reply will be in line with the issues discussed in his comment.
Źródło:
Geological Quarterly; 2019, 63, 2; 429--433
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-5 z 5

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