Skrzypkowski, Krzysztof

Now showing 1 - 3 of 3

Access status: Open Access ,
Application of the ground penetrating radar (GPR) method in the detection of underground utilities above the Kobilja Glava Tunnel
(Wydawnictwa AGH, 2026) Bektašević, Ekrem; Filipović, Satko; Bojić, Mirnes; Crnogorac, Luka; Gutić, Kemal; Skrzypkowski, Krzysztof
Accurate detection and mapping of underground utilities in complex urban environments, particularly in intensive construction zones such as tunnel sites, presents a significant engineering challenge. This paper investigates the application of ground penetrating radar (GPR) integrated with high-accuracy real-time kinematic (RTK) GNSS positioning to identify and spatially define a damaged sewer pipeline above the Kobilja Glava tunnel construction site in Sarajevo, Bosnia and Herzegovina. Non-destructive investigation was required due to the lack of reliable underground utility documentation and wastewater ingress into the tunnel during construction. The study was conducted under complex urban and geotechnical conditions, including asphalt pavement, high soil moisture, heterogeneous subsurface layers, and proximity to the tunnel. GPR surveys were performed using a dual- channel Leica DS2000 system with 250 MHz and 700 MHz antennas, combining grid-based and free-profile measurements. Spatial georeferencing was achieved with a Topcon Hiper HR RTK GNSS receiver, which provides centimeter-level positioning of identified reflectors within the national coordinate system of Bosnia and Herzegovina. Data processing and interpretation followed standard GPR procedures. Results show that the sewer pipeline was reliably identified through hyperbolic reflections, with the depth of the pipe crown ranging from 1.1 to 1.7 m. Integration of GPR and GNSS data enabled precise reconstruction of the pipeline’s position and depth, supporting the design of a new pipeline and reducing construction risks. The study demonstrates the high effectiveness of the integrated GPR-GNSS approach in complex urban environments near tunnel structures. These findings suggest that the integration of GPR and GNSS technologies serves not only for object detection but also provides a critical methodological framework for real-time risk assessment during underground construction. The study demonstrates how precise spatial definition of damaged infrastructure can prevent broader geotechnical instabilities, elevating the work from a local case study to a universal model for monitoring urban infrastructure under stress.
Access status: Open Access ,
Application of seismic refraction methods for rock mass characterization at the lead mine tailings site in Olovo Mine
(Wydawnictwa AGH, 2026) Bektašević, Ekrem; Skrzypkowski, Krzysztof; Kahrimanović, Semir; Crnogorac, Luka; Gutić, Kemal
In this study, the application of seismic refraction for the characterization of the rock mass at the lead mine tailings facility in Olovo is presented, with the aim of identifying lithostratigraphic horizons, structural discontinuities, and zones of reduced mechanical resistance that may affect tailings stability. The investigations were conducted along seven seismic profiles of varying lengths and resolutions, designed to cover both shallow and deeper portions of the rock mass to a depth of approximately 60 m. Data processing and interpretation were carried out using the Delta-t-V seismic tomography method, which enables reliable reconstruction of P-wave velocities even under conditions of complex geological structure and velocity inversions. The obtained results indicate pronounced heterogeneity of the rock mass, with clearly differentiated zones of surface embankments and unconsolidated materials (600–1,200 m/s), transitional zones of degraded and karstified rocks (1,800–3,200 m/s), and basal horizons of compact limestone, where P-wave velocities reach values of approximately 4,400 m/s. Particular attention was given to locally developed low-velocity anomalies within deeper horizons, interpreted as karst structures and cavernous zones that are potentially critical for tailings stability. By integrating the individual profiles, a unified 3D rock mass model was developed, enabling spatial analysis of anomalies and reliable terrain zoning. The results confirm that seismic refraction, combined with the Delta-t-V method, represents an efficient, non-destructive, and engineering-relevant tool for characterizing complex tailings rock masses. The developed models have direct application in stability assessment, remediation planning, and the enhancement of mining and environmental safety systems.
Access status: Open Access ,
Impact of heating of carboniferous rocks on their mechanical parameters
(2012) Małkowski, Piotr; Kamiński, Paweł; Skrzypkowski, Krzysztof
W niniejszym artykule przedstawiono wyniki badań wytrzymałościowo-odkształceniowych skał karbońskich - łupków ilastych, łupków piaszczystych, łupków ilastych zapiaszczonych oraz piaskowców po wyprażeniu ich w temperaturze 1000 stopni Celsjusza. Badane skały pochodzą z miejsca projektowanego w Polsce podziemnego georeaktora z kopalni Wieczorek. W artykule przedstawiono wartości wytrzymałości na ściskanie i rozciąganie skał, modułu sprężystości liniowej oraz zmian powyższych parametrów na skutek działania na skały wysokich temperatur. Przedstawiono także straty prażenia jakim ulegają ww. skały oraz skonfrontowano powyższe badania ze zmianą właściwości fizycznych skał na skutek ich ogrzewania.

Skrzypkowski, Krzysztof

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