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Author: Admin | 2025-04-28
Rock beam at different stages in the CP entry and exit stages: (A) Stress analysis of the left side of the O section; (B) Stress analysis of rock beam in the OA section; (C) Stress analysis of rock beam in the AB section; (D) Stress analysis of rock beam in the BC section; (E) Stress analysis of the rock beam on right side of the C section. Figure 17Variation curves of bending moment and shear force of main roof rock beam with different stress concentration coefficients above the CP: (A) K = 3; (B) K = 4.Figure 17Variation curves of bending moment and shear force of main roof rock beam with different stress concentration coefficients above the CP: (A) K = 3; (B) K = 4. Figure 18Variation curves of bending moment and shear force of main roof rock beams with different CP widths at different distances into the CP: (A) L0 = 5 m and L = 15, 20, 25, 30, and 50 m, (B) L0 = 10 m and L = 15, 20, 25, 30, and 50 m.Figure 18Variation curves of bending moment and shear force of main roof rock beams with different CP widths at different distances into the CP: (A) L0 = 5 m and L = 15, 20, 25, 30, and 50 m, (B) L0 = 10 m and L = 15, 20, 25, 30, and 50 m. Table 1Analysis table of incoming pressure characteristics of 22,410 working faces at each stage. Mining stagePeriodic weighting interval (m)Working resistance during weighting (kN)Working resistance during un-weighting (kN)Dynamic load factorInitial mining stageSmall: 13.3；large: 19.5average: 16.416,21411,9021.36Normal mining stageSmall: 11；large: 19average: 15.3Small： 15,537large： 18,31912,560Small： 1.22large： 1.46Passing coal stage1322,84314,8541.51Mining stagePeriodic weighting interval (m)Working resistance during weighting (kN)Working resistance during un-weighting (kN)Dynamic load factorInitial mining stageSmall: 13.3；large: 19.5average: 16.416,21411,9021.36Normal mining stageSmall: 11；large: 19average: 15.3Small： 15,537large： 18,31912,560Small： 1.22large： 1.46Passing coal stage1322,84314,8541.51 -->
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