1642-2511

Hazard evaluation of mining terrain based on horizontal strain survey

Ocena zagrożenia powierzchni terenu górniczego na podstawie pomiarów odkształceń poziomych

Sopata

Paweł

author

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie

Correspondence to: Paweł Sopata Pawel.Sopata@agh.edu.pl

05 12 2025

Vol. 24 (2025) 2025 51 60

2025

This paper presents a case study focused on the measurement of horizontal deformations occurring above an active coal seam extraction site in the Upper Silesian Coal Basin. The investigation of ground surface deformation effects was carried out along a randomly selected 48-meter test section located above a mining panel. Within the defined segment, the deformation index values were determined using measurements based on varying base lengths, ranging from 1 to 24 meters. The primary objective of the study was to identify the actual magnitudes of horizontal deformations that developed within these bases during the course of the deformation process. The main source of data consisted of measurements of distances between permanently stabilized survey points positioned at 1-meter intervals along the observation line. These measurements were obtained using a specially designed and constructed instrument. The values of the deformation index, depending on the length of the measurement base, resulted in significant differences in the assessment of surface stability and potential hazard within the same area. The horizontal deformations determined from 6-meter and standard 24-meter bases did not fully capture the actual deformation hazard affecting the ground surface. The presented case study demonstrates an irregular spatial distribution of horizontal deformations within bases of 6 meters and longer. The maximum deformation index values recorded over shorter segments considerably exceeded the averaged values, leading to changes in the evaluation of the mining area’s deformation risk at the study site.

1. Knothe, S. Forecasting the Effects of Mining Exploitation. Silesian Publishing House, Katowice, 1984.

2. Białek, J. Forecast of horizontal deformation categories prepared with an assumed safety level. Mining Review, 2013; no. 8.

3. Knothe, S. The equation of the profile of the finally developed subsidence basin. Archives of Mining and Metallurgy, 1953; volume 1, pp. 22–38.

4. Kowalski, A. 2007. Unsteady mining surface deformations in terms of forecast accuracy. Scientific Works of GIG, Katowice, 2007; no. 871.

5. Szpetkowski, S. Formation of horizontal strain values based on observations from several mining basins. Works of the Mining and Geodesy Commission. Mining, 1972; No. 11.

6. Stoch, T., Ostrowski, J., Niedojadło, Z., Sopata, P., Skobel, P. Study of horizontal deformation distributions in measurement rosettes. Mining Review, 2014; no. 8, 165–170.

7. Pielok, J. Determination of the surface strain tensor in mining areas based on geodetic measurements. AGH University of Science and Technology Press, Cracow, 2005.

8. Budryk, W., Knothe, S. The rules for classifying the area of the Upper Silesian industrial district due to the possibility of building them. Technical protection of construction investments in mining areas. Committee for the affairs of the Upper Silesian Mining District. Rock Mechanics Commission of the Polish Academy of Sciences, Bulletin, Warsaw, 1956; no. 4.

9. Popiołek, E., Ostrowski, J. An attempt to identify the main causes of discrepancies between predicted and observed post-mining deformation indicators. Protection of Mining Areas, 1981; zeszyt 58.

10. Ostrowski, J. Environmental protection in mining areas. Publishing house of Mineral and Energy Economy Research Institute Polish Academy of Sciences, Cracow, 2001.

11. Sopata, P., Wójcik, A., Mrocheń, D. Length changes within the single side of the observation line. Mining Surveying and Protection of Mining Areas in the Current Conditions for Extraction of Mineral Resources in Poland, Cracow, 2016.

12. Zych, J. Horizontal terrain strains, their prediction and measurement.Scientific works GIG. Series: Conference, V Days Surveying and Protection of Mining Areas, Katowice, 1999; no. 30.

13. Batkiewicz, W. Standard deviations of post-mining deformation of the rock mass. PWN, Geodesy, Kraków, volume 10, 1971.

14. Klein, G. The length of the measuring base and the size of the deformation fluctuations in the bulk material. Notebooks of mining problems. Warsaw, 1975; volume 13.

15. Klein, G. Remarks on the influence of the length of the measurement base on variance estimators of deformation fluctuations. Archives of Mining Sciences, 1984; zeszyt 1, Volume 29.

16. Stoch, T. 2019. Horizontal displacement in mining areas protection. AGH University of Science and Technology Press. Dissertations Monographs no. 367, Cracow, 2019.

17. Popiołek, E. Statistical dispersion of horizontal terrain deformations in the light of geodetic observations of mining exploitation effects. Scientific Notebooks of the AGH University University of Science and Technology, Geodesy, Cracow, 1976; no. 44.

18. Popiołek, E., Ostrowski, J., Stoch, T. Random dispersion of post-mining surface deformation indicators under contemporary mining conditions in Poland. Proceedings of the Scientific and Technical Conference, IV Days Surveying and Protection of Mining Areas, Rytro, 1997.

19. Klein, G. 1981. Determination of deformations in the rock mass considering their random character. Archives of Mining Sciences, 1981; volume 26, no. 4.

20. Niemiec, T. Forecasting the effects of mining exploitation considering face advance rate and process randomness. Mining Review, 2012; no. 8, pp. 192–203.

21. Stoch, T. Influence of geological and mining conditions of deposit exploitation on the randomness of surface displacement and deformation processes. Doctoral dissertation (unpublished), AGH University of Science and Technology, Cracow, 2005.

22. Szpetkowski, S. Determining the lengths of the sides of observation lines for surface deformation studies. Protection of Mining Areas, 1969; no. 9.

23. Zych, J. The influence of the distance of points in the observation lines on the values calculated from the horizontal strain measurements. Archives of Mining Sciences, 1998; volume 43, pp. 315–335.

24. Hejmanowski, R., Kwinta, A. Horizontal deformations and the length of the measurement section. Scientific papers of the Silesian University of Technology, Series: Mining, 2007; no. 278. no. 278 (1752), pp. 131–140.

25. Nguyen, H.V., Pham, K.c., Nguyen, D.B., Nguyen, L.Q. Application of the GNSS method in the monitoring of mine Surface displacement. A systemic review. Mineral Engineering, 2024; volume 2, no.1, pp. 247–255.

26. Witkowski, W., Łukosz, M., Guzy, A., Hejmanowski, R. Estimation of mining‑induced horizontal strain tensor of land surface applying InSAR. Minerals, 2021; volume 11, no.7 (https://doi.org/10.3390/min11091005).

27. Ćwiąkała, P., Puniach, E., Gruszczyński, W., Matwij, W. Application of UAV‑based orthomosaics for determination of horizontal displacement caused by underground mining. ISPRS Journal of Photogrammetry and Remote Sensing, 2021; volume 174, pp. 282–303.

28. Kędzior, S. Dreger, M. Geological and mining factors controlling the current methane release from abandoned coal mines in the Upper Silesian Coal Basin (Poland), Energies, 2022; volume 15, no. 17, pp. 1–18.