Uralkali, Berezniki, Russia

Yu. S. Shchegolkov, Chief Specialist, rabota.shegolkov@mail.ru

When determining the actual values of the angular parameters of a displacement process, the correct selection of appropriate criteria is particularly important. These criteria allow the reliable determination of the locations of the characteristic points of the displacement trough. These criteria are not universally applicable: approaches to their selection and use may vary significantly depending on the mining conditions at different mineral deposits. Therefore, studying general methods for selecting criteria for the main angular parameters is of great importance, which is the primary objective of this study. The relevance of this study lies in improving the determination accuracy of the angular parameters that form the basis for calculations related to ensuring the safety of facilities within the influence zone of underground mining operations. The need to improve the determination accuracy of the angular parameters of the earth’s surface displacement process is substantiated. Using development of stratified mineral deposits as an example, it is demonstrated that the predominant contribution to the error in establishing the actual values of boundary angles, angles of maximum subsidence, and angles of displacement is due to the error in determining the locations of the characteristic points of the displacement trough. The key factors significant for the formation of this error were identified and systematized. It was found that the magnitude of systematic errors and the individual behavioral characteristics of undermined rock masses are highly important when selecting criteria. The latter should be taken into account through application of appropriate methodological approaches to determining the locations of the characteristic points in the movement trough. Based on the above, the practical methods for selecting criteria for the considered angular parameters were proposed and substantiated, and the resulting conclusions were drawn. The obtained research results can be useful in design and mine surveying practices, as well as in the development and updating of regulatory and methodological documentation on the research topic under consideration.

1. Posylnyi Yu. V. Geometry of Ground Surface Trough above Coal Mine Roadways. Novocherkassk : YuRGTU (NPI), 2012. 215 p.
2. Shchegolkov Yu. S. Assessment of the values of total shifts angles and maximum subsidence angles in conditions of mining reserves of the Verkhnekamskoe deposit of potassium–magnesium salts. Marksheyderiya i nedropolzovanie. 2025. Vol. 25, No. 1. pp. 61–70.
3. Feng G., Wang P. Stress environment of entry driven along gob-side through numerical simulation incorporating the angle of break. International Journal of Mining Science and Technology. 2020. Vol. 30, Iss. 2. pp. 189–196.
4. Cao J., Huang Q., Guo L. Subsidence prediction of overburden strata and ground surface in shallow coal seam mining. Scientific Reports. 2021. Vol. 11. DOI: 10.1038/s41598-021-98520-9
5. Panteleev I. A., Lomakin I. S., Baryakh A. A. Inclusion of salt rock jointing in evaluation of load-bearing capacity of rib pillars. Eurasian Mining. 2025. No. 2. pp. 42–47.
6. Luo J., Li Y., Guo Q., Meng X., Wang L. Research on the surface subsidence characteristics and prediction models caused by coal mining under the reverse fault. Scientific Reports. 2024. Vol. 14. DOI: 10.1038/s41598-024-75182-x
7. Muller R. A., Petukhov I. A., Krasovskiy A. N., Kleshchev P. E. Theoretical Calculation Methods for Ground Surface Movement and Deformation Induced by Underground Mining. Moscow : TsNIEIugol, 1977. 26 p.
8. Shchedrina N. N. Finding the shift angle of the ground surface and the rock mass at the deposits with unexplored nature of the movement process. Marksheyderiya i nedropolzovanie. 2013. No. 6(68). pp. 53–56.
9. Volkomorova N. V., Zhabko A. V. The direct method of delineating the areas of hazardous ground movement and justifying the angular parameters of the ground movement process. Izvestiya vuzov. Gornyi zhurnal. 2025. No. 4. pp. 66–78.
10. PB 07–269–98. Safety Rules for Structures and Natural Objects to Be Protected from Hazardous Influence of Underground Coal Mining. Saint-Petersburg : VNIMI, 1998. 291 p.
11. Kulibaba S. B. Boundaries of troughs. Ground Surface Movement and Slope Stability : Collection of Scientific Papers. Leningrad : VNIMI, 1980. pp. 57–60.
12. Myakenkiy V. I. Justification of criteria for boundary angles. Surveying in the Socialist Countries : Collection of Scientific Papers. Leningrad : VNIMI, 1988. Vol. 11. pp. 213–216.
13. Posylnyi Yu. V. Justification of boundary criterion for ground surface movement. MIAB. 2008. No. 2. pp. 104–114.
14. Normative Standards of Object Protection from Harmful Effects of Mining Operations in Hazardous Zones. Subsoil Protection and Geological Surveying Control : Source-Book. Series 7. Issue 8. Moscow : NTTs PB, 2010. 214 p.
15. Abelseitov K. B., Akimov A. G., Boshenyatov E. V., Vedyashkin A. S., Gavrilenko Yu. N. et al. Guide for Observation of Rock Mass and Ground Surface Movements and Undermined Structures at Coal and Shale Deposits. Moscow : Nedra, 1989. 96 p.
16. Azarov B. F., Karelina I. V. Problem Solving in Theory of Geodetic Measurement Errors. Barnaul : Izdatelstvo AltGTU, 2013. 29 p.