Scientific seminar of Visiting Professor Pietro Teatini

On 12th May 2022, there was a scientific seminar at the Faculty of Geo-Data Science, Geodesy, and Environmental Engineering, during which Visiting Professor Pietro Teatini presented a short lecture titled 'Advanced 3D continuous and discontinuous geomechanical modelling of stress and deformation fields due to subsurface fluid withdrawal and injection'.

Pietro Teatini is a professor in Hydrology and Hydraulic Engineering at the Department of Civil, Environmental and Architectural Engineering, University of Padova, Italy.

The main topic of the meeting was the modelling of surface movements of discontinuous deformation caused by fluid withdrawal and injection. The Professor showed that basic modelling techniques are focused mainly on vertical movements and quite often they do not consider the existence of faults of earth fissures. In a presented advanced approach, it is possible to include discontinuous deformations and model both, the vertical and horizontal displacements, which are important considering local people and infrastructure. Professor Teatini also presented 3 case studies, where the advanced methodology of geomechanical modelling was applied, which were located in China, the Netherlands and the USA. Each case study was focused on a different aspect of modelling, addressing the following issues: fissures modelling, threats connected with faults reactivation including induced seismicity and modelling of horizontal displacements. The seminar ended with a short discussion about deformation caused by fluid withdrawal and injection, approaches to their modelling and problems connected with this topic




Research internship at the University of Aberdeen – Artur Guzy, M.Sc., Eng and Wojciech Witkowski, Ph.D., Eng.

In October 2021 Artur Guzy, M.Sc., Eng. (Ph.D. Student of the Department of Mining Areas Protection, Geoinformatics and Mining Surveying and Wojciech Witkowski, Ph.D., Eng. (assistant professor of the Department of Mining Areas Protection, Geoinformatics and Mining Surveying) held their research internship at the Uniwersity of Aberdeen (Great Britain), where the third member of their joint project Andrés González Quirós, Ph.D., works.

The theme of the internship was directly connected with the grant of the European Space Agency: „Application of InSAR to Model Compaction of the Aquifer System and Movement of the Land Surface in Abandoned Mines” (Cosmo-SkyMed Project no. 65954), the head of which is Artur Guzy, M.Sc., Eng.

The degradation of rock mass and the occurrence of land subsidence or even sinkholes is one of the negative effects of underground mining. Such phenomena could damage infrastructure and threaten residents of altered regions. However, underground mining typically requires deep drainage of rock layers via pumping. The original hydrogeological conditions of the rock mass are therefore affected. As a result, due to the change in the groundwater levels and the decrease in the hydrostatic pressure, the aquifer system is depleted and rock mass is additionally compacted. However, with the closure of the mine by flooding, the aquifer system is beginning to be restored. The rock mass is re-filled with groundwater as a result, and uplifts occur on the land surface. However, the fluctuation and rapid flow of groundwater related to the flooding of the mine can also lead to rock mass suffocation nd the formation of sinkholes.

Hard coal mining in Europe has a long tradition and goes back to the beginning of the industrial revolution. Coal mines were mainly located in the United Kingdom, Germany, Belgium, the Netherlands and Spain. Hard coal is still being mined in Poland.



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