Browsing by Subject "collapsing"

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Access status: Restricted ,
Geotechniczna charakterystyka lessów Płaskowyżu Nałęczowskiego
(Data obrony: 2018-11-06) Karpeta, Damian
Wydział Geologii, Geofizyki i Ochrony Środowiska
Problem lessów, przez swoje specyficzne właściwości znany jest w literaturze od około 200 lat. Płaskowyż Nałęczowski wchodzący w skład Wyżyny Lubelskiej jest jednym z najbardziej rozpoznawalnych i zbadanych terenów lessowych w Polsce. Typowa rzeźba lessowa i dobrze wykształcone, grube płaty lessu przyciągają badaczy z całego kraju. Celem niniejszej pracy jest próba opisania utworów lessowych pod kątem właściwości geotechnicznych gruntu. Parametry te są niezwykle ważne ze względu na specyficzne właściwości opisywanego gruntu.
Access status: Open Access ,
Mapping a fracture network formed by hydraulic fracturing in a shale gas reservoir
(Wydawnictwa AGH, 2024) Węglińska, Elżbieta; Leśniak, Andrzej; Pasternacki, Andrzej; Wandycz, Paweł
Wydział Geologii, Geofizyki i Ochrony Środowiska
Microseismic monitoring is an important technique that can be used to identify fractures in rock mass. The aim of this article is to identify, on the basis of the location of microseismic events, structures formed by hydraulic fracturing in the Wysin-2H/2Hbis horizontal well from the Baltic Basin in northern Poland, and to compare the patterns of these structures with the direction of regional stresses. The authors proposed a novel multi-step workflow for finding these structures. To be able to delineate the structures from microseismic events with greater accuracy, a collapsing algorithm was used. Then, based on the Hierarchical Density-Based Spatial Clustering of Applications with Noise (HDBSCAN) clustering algorithm and the elongation coefficient of each cluster, probable fissures were identified and compared against the maximum horizontal stress direction. In addition, based on the 3D seismic data from the Wysin and the calculated geomechanical parameters in the monitoring well, the probability classes of brittleness indices in the LMR (??-??) parameter domain were determined. A comparative analysis was performed between the two variants of microseismic event location (before and after the collapsing procedure) and the estimated probability of a given class of brittleness index. The comparison of the event location with the 3D seismic data was used to validate the results before and after collapsing due to the high resolution of the seismic method. It is shown that the collapsed events appeared in more rigid regions, where more energy release is expected.
Access status: Restricted ,
Problemy związane z projektowaniem posadowień na lessach
(Data obrony: 2010-01-28) Mielniczyn, Anna
Wydział Geologii, Geofizyki i Ochrony Środowiska
This MA thesis describes problems which are connected with making foundations on the loess soil. Loess ground is one of the most important engineering-geological problems, because it can be found on very big areas. Loess occurs in the south Poland, south-west Poland and south-east Poland. It takes about 20 000 km2 of Poland’s surface. In this MA thesis the loess from Kraków and its surroundings was analyzed. To use loess as a building base, it is required to run very detailed research because of its specific geotechnical properties, out of which the collapsing ability is the most important. This MA thesis contains a photographic documentation, which shows phenomena, which are very popular in the loess soil, for example, ravines and landslides.