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Author: Admin | 2025-04-28
50 m; (B) 85 m; (C) 120 m; (D) 155 m; (E) 190 m; (F) 225 m; (G) 260 m; (H) 295 m; and (I) 330 m.It can be seen from Tables 10–12 and Figures 7–9 that the model established in this study can comparatively accurately calculate the inelastic zone width of the coal pillar. The inelastic zone width of the coal pillar calculated by the model established in this study is consistent with that calculated by numerical simulation. The maximum error is within 0.4 m. However, from Tables 11, 12 and Figure 10, it is not difficult to find that the results calculated by the model established in this study are generally larger than those calculated by numerical simulation. The reason why such a problem occurs is believed to be caused by two aspects. The first aspect may be that the model established in this study is based on the physical and mechanical parameters and other relevant parameters of the Antaibao open-pit mine 11# coal obtained after average calculation and relevant treatment, while the numerical simulation is calculated directly based on the original parameters, which leads to the result of the numerical calculation is larger than that of numerical simulation; another (He et al., 2022; Niu et al., 2022; Yang et al., 2022) aspect may be that the grid density limits the numerical simulation, making it impossible to calculate the inelastic zone with a width of less than 0.35 m (in the numerical simulation, the grid width at the coal pillar is 0.35 m). Moreover (He et al., 2021; Wu et al., 2022), it also leads to the result of numerical calculation being larger than that of numerical simulation. However, in general, the accuracy of the calculation model for the inelastic zone width of the coal pillar in highwall mining with backfill established in this study can meet the actual production needs. Therefore, it also shows that the model established in this study is reliable and correct and has specific practical value. FIGURE 10. Established model and numerical simulation results. TABLE 12. Buried depth, physical and mechanical parameters of
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