Improving the accuracy of determining quarry wall deformations by optimizing the parameters of terrestrial stereophotogrammetric surveying

Oleksandr Dolgikh¹, Mykola Stupnik¹

¹Kryvyi Rih National University, Kryvyi Rih, Ukraine

Min. miner. depos. 2026, 20(1):71-79

https://doi.org/10.33271/mining20.01.071

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      ABSTRACT

      Purpose. The research aims to develop and experimentally validate a methodology for terrestrial digital stereophotogrammetric surveying to monitor deformations of deep quarry walls with determination of optimal parameters for the survey basis and initial observation cycle, providing the necessary accuracy in determining deformation values.

      Methods. The research involved designing and conducting a quarry survey on the initial and subsequent dates of deformation observations using a professional digital camera. The obtained digital images were processed using an improved version of the traditional photogrammetric method – the displacement method. In order to improve the efficiency of deformation monitoring using photogrammetric method, requirements for conducting an initial cycle of observations with the determination of optimal parameters for data capture and processing have been substantiated.

      Findings. Based on the results of using terrestrial digital surveying and an improved photogrammetric displacement method, the deformation values at the experimental sites of the quarry walls have been determined with a sufficiently high accuracy during image processing. Requirements for performing the initial cycle of observations of deformation processes have been substantiated, and the influence of its parameters on the effectiveness of further monitoring has been identified. The practical effectiveness of the developed methodology was confirmed during the study of deformations caused by mining operations at the quarries of Private Joint Stock Company “Central Iron Ore Enrichment Works” (PJSC “Central GOK”).

      Originality. Optimal parameters for the initial cycle of observations of quarry wall deformations using the terrestrial digital surveying method have been determined. Patterns have been identified between the accuracy of determining the coordinates of points using a created digital terrain model and the spatial position of the survey basis. Requirements for computing equipment characteristics that ensure efficient processing of large volumes of digital images and increased productivity of office work have been substantiated.

      Practical implications. The photogrammetric displacement method for determining deformations from images taken at different times has been improved. The developed method for monitoring shear processes and other types of deformations based on this method provides for the determination of the values of spatial changes in the position of examined object points with the necessary accuracy and prompt obtaining of information about its current state and prospects for further safe operation.

      Keywords: digital images; terrestrial stereophotogrammetric surveying; survey basis; point coordinates; multi-temporal images

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