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Predicting Mining Areas Deformations under the Condition of High Strength and Depth of Cover

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  • Piotr Strzałkowski

    (Faculty of Mining, Safety Engineering and Industrial Automation, Silesian University of Technology, Akademicka 2A, 44-100 Gliwice, Poland)

Abstract

This paper presents an analysis of mining area deformations in the rock mass consisting of high depth and strength strata deposited in the cover. The analysis of land surveying results enabled the identification of the parameters required to predict subsidence, which differed from the typical parameters for the Upper Silesian Coal Basin. The parameters of the Budryk–Knothe theory were determined based on the results of geodetic measurements. The calculations of the final state of deformations for planned mining were made using the average and characteristics for the study area parameter values. Based on experience, it is known that the range of subsidence trough depends on the mechanical properties of the rock mass. This study shows that the presence of high-strength rocks also reduces the value of the coefficient of roof control. Subsequently, calculations were made by a computer simulation of longwall mining to determine the course of indices of deformation over time. The calculations were conducted twice: on the assumption that the impact was immediate and on the assumption of the parameter values typical for the basin, and formula expressing the course of subsidence over time with the parameter values based on the measurement results. The obtained distributions of deformation indicators were diametrically opposed to each other. The results of the calculations with the parameter values appropriate for the region indicate that it is possible to carry out a planned mining operation without creating a risk to objects on the surface.

Suggested Citation

  • Piotr Strzałkowski, 2022. "Predicting Mining Areas Deformations under the Condition of High Strength and Depth of Cover," Energies, MDPI, vol. 15(13), pages 1-17, June.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:13:p:4627-:d:846847
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    References listed on IDEAS

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    1. Gang Li & Qinghe Yang, 2020. "Corrigendum to “Prediction of Mining Subsidence in Shallow Coal Seam”," Mathematical Problems in Engineering, Hindawi, vol. 2020, pages 1-1, September.
    2. Zhanjie Feng & Wenbing Guo & Feiya Xu & Daming Yang & Weiqiang Yang, 2019. "Control Technology of Surface Movement Scope with Directional Hydraulic Fracturing Technology in Longwall Mining: A Case Study," Energies, MDPI, vol. 12(18), pages 1-18, September.
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    5. Jihuan Han & Jiuqun Zou & Chenchen Hu & Weihao Yang, 2019. "Study on Size Design of Shaft Protection Rock/Coal Pillars in Thick Soil and Thin Rock Strata," Energies, MDPI, vol. 12(13), pages 1-17, July.
    6. Bin Zhang & Jiacheng Ye & Zhongjian Zhang & Liang Xu & Nengxiong Xu, 2019. "A Comprehensive Method for Subsidence Prediction on Two-Seam Longwall Mining," Energies, MDPI, vol. 12(16), pages 1-18, August.
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