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Tytuł:
Materials of the Malice culture at site 28 in Świerszczów (AZP 86-94/218)
Autorzy:
Łaczek, Grzegorz
Miszk, Łukasz
Nowak, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/442499.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Jagielloński. Instytut Archeologii
Tematy:
Malice culture
Hrubieszów Basin
rescue excavations
Opis:
The site of Świerszczów 28 was discovered in 2012 during field works connected with the construction of the Hrubieszów ring-road. The site is located on the border between Horodło Bar (Grzęda Horodelska) and Hrubieszów Basin (Kotlina Hrubieszowska). As a result of excavations, 221 non-portable features were found, of which 81 were dated based on artefacts found in their fills. The oldest phase of settlement is represented by artefacts connected with the Rzeszów phase of the Malice culture. Nine features yielded a series of 66 fragments of vessels (the majority of them were found in one feature, i.e. pit no. 243–53 sherds) which, in terms of technology, belong to the category of medium- or thick-walled pottery. Pottery forms represent vessel types typical of the Malice culture: biconical vessels – both pots and amphorae, profiled bowls and beakers on hollow feet. Vessels were decorated with ornamentation motives arranged in horizontal bands. The most typical ornaments were notches (corrugations), fingernails notches, “pinched” impressions and fingertips imprints. Knobs and plastic belts also appeared. Flint artefacts are represented by only 11 specimens. Two of them merit particular attention: an end-scraper with an oval front from feature no. 243 and a blade found in the layer of humus. Nine artefacts were made of Volhynian flint, the remaining two are burnt. The traces of the Malice culture occupation at Świerszczów 28 site are connected with a small settlement. The analyzed collection of artefacts is linked with the oldest segment of the Rzeszów phase (IIa) of the Malice culture, connected with trans-Carpathian influences from the proto-Tiszapolgár culture and phase A of the Tiszapolgár culture, which in terms of absolute chronology corresponds to the last quarter of the fourth millennium BC.
Źródło:
Recherches Archéologiques Nouvelle Serie; 2013-2014, 5-6; 219-232
0137-3285
Pojawia się w:
Recherches Archéologiques Nouvelle Serie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Travels of Count Michał Tyszkiewicz to Africa, his excavations in 1861–1862, and the origin of his collection of Egyptian antiquities
Autorzy:
Niwiński, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/1774653.pdf
Data publikacji:
2019-12-30
Wydawca:
Uniwersytet Warszawski. Wydawnictwa Uniwersytetu Warszawskiego
Tematy:
Michał Tyszkiewicz
Egypt
Nubia
excavations
collection
Opis:
Count Michał Tyszkiewicz (1828–1897) was one of the most renowned collectors of the ancient classical art at the end of the 19th century. His interest in archaeology and ancient art was developed during his travel through Egypt in 1861. His Journal of the Travel to Egypt and Nubia, fortunately found in 1992 in Poznań, recounts this journey. From Egypt, Michał Tyszkiewicz brought a collection of antiquities, estimated to have comprised c. 800 objects; today, over a half of them can be found in museums in Paris (Louvre), Warsaw, Vilnius, Kaunas, and Moscow. The majority of the objects originated from excavations conducted by the count, particularly in Thebes (Luxor area), by virtue of an official licence granted to him exceptionally by Mohamed Said Pasha – the then head of the Egyptian state. The present article discusses the circumstances of granting of this permission in the period when a strict state monopoly was imposed on archaeological investigations and presents the course of the excavations along with their results.
Źródło:
Światowit; 2018, 57; 223-236
0082-044X
Pojawia się w:
Światowit
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Large Fortified Settlement Near Shepetivka: History of the Medieval Settlement – History of the Archaeological Site
Autorzy:
Peskova, Anna
Mikhaylov, Kirill
Powiązania:
https://bibliotekanauki.pl/articles/960092.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Rzeszowski. Instytut Archeologii Uniwersytetu Rzeszowskiego. Muzeum Okręgowe w Rzeszowie
Tematy:
Early Rus’ fortified settlement
excavations
research
interpretation
Opis:
The dramatic history of the medieval fortified settlement, located between the Sluch’ and Goryn’ Rivers (near the village of Horodyshche, Shepetivka District, Khmelnytskyi Region, Ukraine), destroyed and burned as a result of Tatar-Mongol raids in the middle of the 13th c., gave rise to the appearance of a cultural layer which is unique as regards its abundant finds. During the excavations led by Mikhail Karger in 1957–1964, almost all the territory of the site was investigated (3.6 ha) and many thousands of archaeological and anthropological finds were collected. M. Karger planned to publish a monograph based on the research into these collections undertaken by the members of his expedition team, but his plan did not reach fruition. Over the last sixty years, the materials have often been referred to by specialists. Today the bibliography relating to the analysis and interpretation of the materials discovered during the excavations includes dozens of articles. The rather disjointed nature of the materials published so far, and the random and incomplete selection of finds for detailed investigation have meant that the presentation of the site as a whole has not been a well-integrated one and interpretations have often been inconsistent. Recently a project has been drawn up, enabling a team from the Institute for the History of Material Culture, to prepare the excavated materials for publication, supported by a grant from the Russian Foundation for Basic Research.
Źródło:
Analecta Archaeologica Ressoviensia; 2018, 13; 417-440
2084-4409
Pojawia się w:
Analecta Archaeologica Ressoviensia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An inventory of opencast mining excavations recultivated in the form of water reservoirs as an example of activities increasing the retention potential of the natural environment: a case study from Poland
Autorzy:
Szafarczyk, Anna
Gawałkiewicz, Rafał
Powiązania:
https://bibliotekanauki.pl/articles/27310149.pdf
Data publikacji:
2023
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
geodetic inventory
mining excavations
recultivation
retention
blue infrastructure
Opis:
The article presents examples of the employment of various geodetic measuring tools used for a detailed inventory of lake basins and shorelines. The measurement and analysis covered three post-mining open pit excavations recultivated as water reservoirs: two in Krakow (Bagry Wielkie and Bagry Małe) and one in Piaseczno (Piaseczno Sulphur Mine). Attention was paid to the factors that reduce the accuracy of the inventory of some flooded post-mining excavations, which determine the degree of usefulness of the morphometric data set for later analyses. According to available estimates, only about one-third of all water reservoirs in Poland have detailed geodetic documentation in the form of bathymetric maps. This documentation usually does not include water reservoirs of anthropogenic origin formed after the flooding of post-mining excavations (mines: sand, gravel, clay, limestone, sulphur, aggregates, etc.). The authors suggest the introduction of a document known as a reservoir documentation card and the creation of a database covering all anthropogenic water reservoirs. Considering the water deficit in Poland, it may be necessary to develop a detailed database of water resources in the short term.
Źródło:
Geology, Geophysics and Environment; 2023, 49, 4; 401--418
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improved formulation of the Hardening Soil model in the context of modeling the undrained behavior of cohesive soils
Autorzy:
Truty, A.
Obrzud, R.
Powiązania:
https://bibliotekanauki.pl/articles/178469.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
soil constitutive modeling
undrained shear strength
deep excavations
Opis:
The analysis of an important drawback of the well known Hardening Soil model (HSM) is the main purpose of this paper. A special emphasis is put on modifying the HSM to enable an appropriate prediction of the undrained shear strength using a nonzero dilatancy angle. In this light, the paper demonstrates an advanced numerical finite element modeling addressed to practical geotechnical problems. The main focus is put on serviceability limit state analysis of a twin-tunnel excavation in London clay. The two-phase formulation for partially saturated medium, after Aubry and Ozanam, is used to describe interaction between soil skeleton and pore water pressure.
Źródło:
Studia Geotechnica et Mechanica; 2015, 37, 2; 61-68
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assumptions for the proposed method of monitoring deformations in wooden grating casings in the conditions of Wieliczka Salt Mine
Autorzy:
Szpak, M.
Powiązania:
https://bibliotekanauki.pl/articles/89069.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
Tematy:
mining casing
historic excavations
wooden constructions
Wieliczka Salt Mine
Opis:
This article describes a measuring method used for monitoring deformations in wooden grating mining casings. It is intended, in particular, to determine the degree of deflection of load-bearing elements in relation to their original position. It was prepared especially to supplement the technical evaluation of wooden supporting casings in historic mines, underground sections of tourist routes, tunnels etc. The primary reason for the development of this problem were the designs prepared in recent years for large-scale grating constructions at Wieliczka Salt Mine and those for their reconstructions (strengthenings). The article describes the assumptions for the method proposed as well as the measurement system prepared. At Wieliczka Salt Mine two chambers with grating casings were selected and these were equipped with measuring devices. This paper presents the characteristics of these structures, the distribution of the devices installed and the course of the measuring process.
Źródło:
Mining Science; 2015, 22, Special Issue 2; 161-170
2300-9586
2353-5423
Pojawia się w:
Mining Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On consistent nonlinear analysis of soil-structure interaction problems
Autorzy:
Truty, A.
Powiązania:
https://bibliotekanauki.pl/articles/178195.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
soil-structure interaction
constitutive modeling
deep excavations
finite elements
Opis:
Nonlinear soil-linear structure computational strategy is commonly accepted in the community of geotechnical engineers using advanced finite element software for solving complex soil-structure interaction problems. However, further design procedure of the structural elements is carried out using increased values of the computed elastic stress resultants. It is absolutely not clear whether this method is conservative and, therefore, whether safe or not. To tackle this problem, a fully consistent nonlinear analysis of a deep excavation protected by the diaphragm wall is analysed here. The subsoil is modelled using the Hardening Soil model, while reinforced concrete is modelled using the modified Lee-Fenves model enhanced by the Eurocode 2 (EC2)-compatible creep module, developed by the author. It is shown that the commonly used nonlinear soil-linear structure computational strategy may yield insufficient amount of reinforcement from the ultimate limit state (ULS) and serviceability limit state (SLS) points of view. A consistent and conservative method of combining fully nonlinear analysis and the rules imposed by the EC2 is proposed.
Źródło:
Studia Geotechnica et Mechanica; 2018, 40, 2; 86-95
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preventive Archaeology in Latvia: example investigations in the historical town centres on Kuldīga and Ventspils
Archeologia ratownicza na Łotwie na przykładzie badań w centrach dwóch miast historycznych Kuldygi i Windawy
Autorzy:
Zirne, Sandra
Lūsēns, Mārtiņš
Vijups, Armands
Powiązania:
https://bibliotekanauki.pl/articles/896897.pdf
Data publikacji:
2015
Wydawca:
Narodowy Instytut Dziedzictwa
Tematy:
preventive archaeology
supervision
rescue excavations
historical development
dune erosion
Opis:
This article deals with preventive archaeology issues in the Republic of Latvia. Legislative bacground provides presence of archaeologists in construction projects. During last decade in the Latvia the largest share of carried out archaeological fieldwork are archaeological supervisions. Despite of small scale rescue excavations and archaeological supervisions significant archaeological data has been collected on further investigations on historical development of ancient towns. As examples are presented the most interesting discoveries in the two towns located in the Western part of the Latvia – Kuldīga and Ventspils. Archaeological investigations of the town streets in Kuldīga, carried out by M. Lūsēns, supplemented the reconstruction and localization of old Kuldīga, mostly based on information found in written sources. Small-scale preventive archaeological projects that have taken place in the seaside town Ventspils has resulted in a study of A.Vijups on the impact of dune erosion processes on historical development of town.
Źródło:
Raport; 2015, 10; 219-231
2300-0511
Pojawia się w:
Raport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure of Archaeological 17th Century Cast Copper Alloys
Autorzy:
Konieczny, J.
Labisz, K.
Głowik-Łazarczyk, K.
Ćwiek, J.
Wierzbicki, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/382152.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
metallography
archaeometallurgy
microstructure
excavations
phase analysis
metalografia
archaeometalurgia
mikrostruktura
wykopaliska
Opis:
In Poland, researchers have a very strong interest in archaeometallurgy, which, as presented in classical works, focuses on dating artefacts from the prehistoric and early medieval periods in the form of cast iron and copper castings. This study, extending the current knowledge, presents the results of a microstructure investigation into the findings from the Modern era dating back to the late Middle Ages. The investigated material was an object in the form of a heavy solid copper block weighing several kilograms that was excavated by a team of Polish archaeologists working under the direction of Ms Iwona Młodkowska-Przepiórowska during works on the marketplace in the city of Czestochowa during the summer of 2009. Pre-dating of the material indicates the period of the seventeenth century AD. The solid copper block was delivered in the form of a part shaped like a bell, named later in this work as a “kettlebell”. To determine the microstructure, the structural components, chemical composition, and homogeneity, as well as additives and impurities, investigations were carried out using light microscopy, scanning electron microscopy including analysis of the chemical composition performed in micro-areas, and qualitative X-ray phase analysis in order to investigate the phase composition. Interpretation of the analytical results of the material’s microstructure will also help modify and/or develop new methodological assumptions to investigate further archaeometallurgical exhibits, throwing new light on and expanding the area of knowledge of the use and processing of seventeenth-century metallic materials.
Źródło:
Archives of Foundry Engineering; 2017, 17, 2; 190-196
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rescue archaeological research on the Dominican Square in Cracow in the light of interdisciplinary studies
Autorzy:
Łyczak, M.
Powiązania:
https://bibliotekanauki.pl/articles/184499.pdf
Data publikacji:
2014
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
medieval architecture
archaeological excavations
cultural layer
petrographic study
geochemical study
Opis:
The rescue excavations associated with the renovation of surfaces surrounding the Dominican Basilica of the Holy Trinity in Cracow were conducted in 2011-2012 in front of the church. This research confirmed the presence of a churchyard cemetery whose origins date back to the 12th century and led to the discovery of previously unknown relics of medieval architecture in the form of two pieces of the masonry foundation of the Gothic chapels and presumably pre-Dominican (or early-Dominican) church of the Holy Trinity as well as undisturbed culture layers from early mediaeval times. The research was carried out in close collaboration with researchers in architecture and art history; it enabled preliminary reconstruction of the plans of the discovered buildings. Petrographic analysis of building material and samples of mortars used provided information on mediaeval construction techniques. Human bone material was analyzed by anthropologists. As a result, the gender, age and health status of members of the mediaeval and modern populations of Cracow buried in the cemetery were determined. Geochemical studies also helped to assess the degree of land contamination related to the presence of the cemetery. A detailed analysis of the cultural layer representing the residue of the open settlement along with its coeval economical structures was carried out. Layer dating was based on a formal analysis of the ceramic material. Osteological research of the animal bone material and palaeobotanical studies of soil samples taken from settlement layers allowed clarification of the nature of the settlement.
Źródło:
Geology, Geophysics and Environment; 2014, 40, 2; 207-218
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rescue excavations at site 1 in Witów, Proszowice district. Seasons 2004 – 2006
Autorzy:
Gawlik, Anna
Godlewski, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/442388.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Jagielloński. Instytut Archeologii
Tematy:
Witów
excavations 2004-2006
Lusatian culture
fortifications
early Medieval cemetery
Opis:
Excavations at site 1 in Witów, in the years 2004 – 2006, were a continuation of rescue excavations started in 2002. Excavations covered three areas most likely to be destroyed. At the foot of the promontory (trench 1) a sequence of cultural strata dating from the Neolithic (Funnel Beaker culture) through the Bronze Age (Lusatian culture) until the Roman period was unveiled. In trench 2 excavation works were continued on the remains of fortifications (embankment with elements of wooden structures) connected with the Lusatian culture. Within the trench no. 3 next settlement features of the Lusatian culture and early Medieval skeletal graves were discovered. The most interesting discoveries in the reporting period include the Lusatian burials in trapezium-like pits, unearthed in the trench no. 3. Due to its equipment (including ceramics of the “knob” style) and 14C dating, they should be tied with the origins of the Lusatian culture. Other interesting findings were also silver coins (denarii) from a Medieval cemetery. Research in seasons 2004 - 2006 proved most of the conclusions reached in previous seasons: the multicultural nature of the site, high intensity of the Lusatian culture settlement, and the presence of fortifications of this culture.
Źródło:
Recherches Archéologiques Nouvelle Serie; 2009, 1; 83-99
0137-3285
Pojawia się w:
Recherches Archéologiques Nouvelle Serie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rescue excavations at the multi-cultural site 1 in Grodowice, Kazimierza Wielka district, season 2005
Autorzy:
Godlewski, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/442540.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Jagielloński. Instytut Archeologii
Tematy:
Grodowice
rescue excavations
Funnel Beaker Culture
Pomeranian Culture
Medieval cemetery
Opis:
An aarchaeological site at Grodowice was discovered in spring 2005 during surface surveys. The presence of skeletal graves destroyed by agricultural work prompted to begin rescue excavations in the summer of 2005. An area of 250 sq. m was explored, and 35 archaeological features were discovered. Three chronological horizons were discerned: Neolithic village (Funnel Beaker Culture), a single cinerary grave of the Pomeranian Culture and skeletal cemetery dated at 11th century AD. The silver “cross” denarii from Medieval graves are the most interesting findings. Due to the constant threat the site rescue diggings must be continued.
Źródło:
Recherches Archéologiques Nouvelle Serie; 2009, 1; 37-47
0137-3285
Pojawia się w:
Recherches Archéologiques Nouvelle Serie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Medieval church and monastery of the Pauline Fathers “Na Skałce” in Kraków-Kazimierz in the light of archaeological investigations in 2007–2008
Autorzy:
Poleski, Jacek
Niemiec, Dariusz
Woźniak, Mateusz
Powiązania:
https://bibliotekanauki.pl/articles/442532.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Jagielloński. Instytut Archeologii
Tematy:
Kraków-Kazimierz
Pauline Fathers church and monastery
excavations 2007-2008
iconographic records
Opis:
The excavations conducted in 2007 and 2008 in the western part of the Pauline Fathers monastery in Kraków-Skałka did not result in the discovery of any medieval church or monastery relics preserved in situ. This is caused first of all by far-going transformations of buildings and their vicinity in the modern period, starting from the 17th century. One of the most interesting results of the research project turned out to be the possibility of making a revised reconstruction of the shape of the limestone rock on which Archangel Michael and St. Stanislaus’ church was built. It allows to reconsider the oldest iconographic record that represents Skałka and its architecture at the close of the Middle Ages. It is also worthwhile emphasizing that the archaeological investigations yielded a very large collection of portable artefacts, a significant part of which are finds of great scientific value. Extremely important is the discovery of a collection of coins, found mainly in bank layers of trench I, being the largest such collection acquired through archaeological excavations in Kraków. The series of coins, including 136 pieces from a broad chronological spectrum (the 14th to the 19th century), contains some unique specimens. A splendid assemblage of several late-Gothic, decorated bronze book fittings and clasps was also discovered. Another extraordinary find is a personal gilded seal matrix. A large series of stove tiles was also acquired, including particularly beautiful early Renaissance tiles. Finally – a particularly interesting series of Gothic, Renaissance and Baroque glazed colour roof tiles (of the “gąsiorówka” type) was found. Their presence leaves no doubts that, at the turn of the 15th century at the latest, the roof of St. Michael Archangel and St. Stanislaus’ church attracted popular attention by its original covering in the form of glazed tiles. Concluding, it can be stated that the discovered assemblage of artefacts is a distinct manifestation of the power and significance of the Kraków Pauline Fathers, who cultivated the tradition of St. Stanislaus’ place of martyrdom and who played an active role in the life of Kraków’s citizens and all Poles already since the Middle Ages.
Źródło:
Recherches Archéologiques Nouvelle Serie; 2010, 2; 291-318
0137-3285
Pojawia się w:
Recherches Archéologiques Nouvelle Serie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Chronology of the Archaeological surface remains of Tepe Pa-Chogha, Central Zagros (Kermanshah, Iran)
Autorzy:
MIRGHADERI, Mohammad Amin
NIKNAMI, Kamal Aldin
Powiązania:
https://bibliotekanauki.pl/articles/2142401.pdf
Data publikacji:
2022-08-22
Wydawca:
Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach
Tematy:
Iran
Central Zagros
Kermanshah
Tepe Pa-Chogha
Sarfirouzabad plain
Excavations
Archaeological Sequences
Opis:
The highland plains of western Iran have been investigated with varying intensity. The Sarfirouzabad plain, located in the south of Kermanshah province, although visited perfunctorily, has not previously been studied systematically, despite desirable ecological and environmental conditions. In 2009, a team from the University of Tehran conducted a systematic and intensive field survey in the region to identify archaeological settlements and to assess their location concerning ecological, environmental and cultural factors impacted the distribution of sites on the plain. The surveyed area was walked in transects at 20-metre intervals and resulted in the identification of 332 archaeological sites from different cultural periods, which added much to the limited knowledge about the history of this region. During this survey, Pa-Chogha as the biggest tell site in the area, was identified. Fifty-nine samples of pottery and five stone tools were collected from the surface of Pa-Chogha dated from Late Chalcolithic to Islamic periods. Unfortunately, due to the expansion of Pa-Chogha village, the site is in danger of being destroyed. Our aim to publish this article is to introduce the Pa-Chogha as an important site for the chronology of Central Zagros at first, and preventing the further destruction of this site at the second.
Źródło:
Historia i Świat; 2022, 11; 81-114
2299-2464
Pojawia się w:
Historia i Świat
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of long expansion rock bolt support in the underground mines of Legnica-Głogów Copper District
Autorzy:
Skrzypkowski, K.
Korzeniowski, W.
Zagórski, K.
Dudek, P.
Powiązania:
https://bibliotekanauki.pl/articles/178284.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
rebuilding of excavations
long expansion rock bolt support
ore mining
3D printing
Opis:
In the underground mines of the Legnica-Głogów Copper District (LGOM) the main way to protect the room excavation is the use of a rock bolt support. For many years, it has proven to be an efficient security measure in excavations which met all safety standards and requirements. The article presents the consumption of the rock bolt support in the Mining Department “Polkowice-Sieroszowice” in the years 2010-2015 as well as the number of bolt supports that were used to secure the excavations. In addition, it shows the percentage of bolt supports that were used to conduct rebuilding work and cover the surface of exposed roofs. One of the factors contributing to the loss of the functionality of bolt supports is corrosion whose occurrence may lead directly to a reduction in the diameter of rock bolt support parts, in particular rods, bearing plates and nuts. The phenomenon of the corrosion of the bolt support and its elements in underground mining is an extremely common phenomenon due to the favorable conditions for its development in mines, namely high temperature and humidity, as well as the presence of highly aggressive water. This involves primarily a decrease in the capacity of bolt support construction, which entails the need for its strengthening, and often the need to perform the reconstruction of the excavation. The article presents an alternative for steel bearing plates, namely plates made using the spatial 3D printing technology. Prototype bearing plates were printed on a 3D printer Formiga P100 using the “Precymit” material. The used printing technology was SLS (Selective Laser Sintering), which is one of the most widely used technologies among all the methods of 3D printing for the short series production of the technical parts of the final product. The article presents the stress–strain characteristic of the long expansion connected rock bolt support OB25 with a length of 3.65 m. A rock bolt support longer than 2.6 m is an additional bolt support in excavations, and it is increasingly frequently used to reinforce roofs and in rebuilding the underground mines of KGHM Polish Copper S.A. In order to conduct the laboratory tests that are most suitable for the mine conditions, and yet are carried out on a laboratory test facility, the Authors used a steel cylinder with an external diameter of 102 mm and a length of 600 mm, which was filled with a core of rock (dolomite) from the roofs of the mine workings. In addition the maximum load that took over the bolt support made of rods and connected with sleeves was determined. For the initial tension, the elastic and plastic range of the maximal displacements, which were measured by the rope encoder, were determined. The statical tests of the expansion rock bolt support were carried out at the laboratory of the Department of Underground Mining in simulated mine conditions. The test facility enables the study of the long bolt rods on a geometric scale of 1:1 for the different ways of fixing. The aim of the laboratory research was to obtain the stress-strain characteristics, of the long expansion rock bolt support with a steel bearing plate and a plate printed on a 3D printer.
Źródło:
Studia Geotechnica et Mechanica; 2017, 39, 3; 47-57
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 33

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