Journal of Geotechnology and Energy
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ISSN 2720-3581
Issue Date
2024
Volume
Vol. 41
Number
No. 4
Description
Journal Volume
Journal of Geotechnology and Energy
Vol. 41 (2024)
Projects
Pages
Articles
Activation of a dewatering well with the skinaut clay mineral disintegration agent
(Wydawnictwa AGH, 2024) Macuda, Jan
The drilling of hydrogeological boreholes by rotary methods and with the use of drilling mud impairs the permeability of water-bearing rocks in the near-hole zone. This is mainly caused by the penetration of solids and mud filtrate into the pores or fractures of the drilled rocks. Consequently, the depression increases, and the hydraulic efficiency of the borehole drops, leading to the reduction of well productivity. As a means of improving the damaged permeability of rocks in the near-hole zone, a clay mineral disintegration agent called SKINAUT was developed and patented. To evaluate its effectiveness in industrial conditions, a test was carried out to activate a dewatering borehole for intaking water from loose formations at the Szczerców open cast. The applied chemical helped to decolmatate the pore medium and lower the hydraulic resistance of the borehole, resulting in a reduction in depression and a significant improvement of its hydraulic efficiency.
Simulations of the behavior of a pipeline made from three different types of materials on a landslide
(Wydawnictwa AGH, 2024) Kowalska-Kubsik, Iwona
The study presents numerical analyses of the behavior of pipelines made from various materials (steel, polypropylene, composite) under landslide conditions. Landslides are phenomena most commonly occurring in foothill and mountainous areas, and pipelines located on slopes can sustain damage during the landslide process. To determine the nature and extent of potential damage, numerical simulations were conducted based on advanced computational methods. The analysis employed the Drucker-Prager constitutive soil model. Numerical analyses make it possible to determine the deformation and stress states in pipelines without the need for costly experimental studies. By comparing simulation results for different materials, it is possible to assess the suitability of various pipes for placement on slopes.
Use of inclined boreholes as injection holes for filling backfill chambers
(Wydawnictwa AGH, 2024) Toczek, Przemysław; Kowalski, Tomasz Wojciech; Artym, Rafał
The latest environmental trends involve the use of renewable energy sources, reducing carbon footprints and minimizing the effects of past human activity. It is therefore very important to minimize the effects of the exploitation of useful minerals by eliminating mining landslides and rock voids. One of the ways to protect them is through drilling works by drilling backfill holes. The authors of the present study show the possibility of adapting diagonal drillings to drill backfill boreholes. It helps to connect voids, caverns or cavities by backfill boreholes through the injection of backfill material into them. The time of pumping the backfill material in the case of vertical and diagonal holes are analyzed.
Mathematical model to analyze the geometric limitations of mechatronic devices moving in curved pipe sections
(Wydawnictwa AGH, 2024) Zwierzyński, Adam Jan
This article presents a method enabling the determination of the minimum radius of pipe bending in which it is possible to move freely a cylinder with defined dimensions. A respective mathematical model has been presented. The below-described method can be useful in the future, while designing mechatronic tools for working in lateral bores starting from a vertical bore, and also while designing inspection robots moving in pipes and pipelines.
Secondary arsenates from the Ľubietová-Svätodušná copper deposit in Slovakia
(Wydawnictwa AGH, 2024) Solecka, Urszula
In the vicinity of Lubietová in the Banská Bystrica region in Slovakia, copper was mined in three deposits: Podlipa, Svätodušná, and Kolba. The study concerns the association of secondary arsenates of the Lubietová-Svätodušná copper deposit. The Lubietová-Svätodušná deposit contains a large number of secondary minerals, formed as a result of weathering in the hypergene zone. Among them, copper arsenates are the most important, due to the rare occurrence of some of them. Four secondary arsenates have been characterized: chalcophyllite, euchroite, olivenite and pharmacosiderite. The minerals were identified using X-ray diffraction (XRD), whereas observations under a scanning electron microscope (SEM) and chemical analysis (EDS) showed that some of them are heterogeneous, contain different substitutions, and show significant variability in the content of individual elements within single specimens.