Research Article
Long-Term Bearing Deformation Characteristics of Caved Gangue in Gob under Different Moisture Conditions
Table 2
Parameters of caved gangue specimens during different testing stage.
| Moisture condition | Testing stage | Deformation | Strain | Residual bulking factor | Initial value (mm) | Final value (mm) | D-value (mm) | Accumulated strain/10−3 | Fitting formula of strain-time | R-square | Initial value | Final value |
| Dry | 20–100 kN load | 0 | 20.82 | 20.82 | 31.8 | — | — | 1.901 | 1.840 | 100 kN constant load | 20.82 | 23.01 | 2.19 | 35.1 | | 0.982 | 1.840 | 1.834 | 100–200 kN load | 23.01 | 38.38 | 15.37 | 58.6 | — | — | 1.834 | 1.789 | 200 kN constant load | 38.38 | 42.23 | 3.85 | 64.5 | | 0.970 | 1.789 | 1.778 | 200–300 kN load | 42.23 | 54.47 | 12.24 | 83.2 | — | — | 1.778 | 1.743 | 300 kN constant load | 54.47 | 59.67 | 5.20 | 91.1 | | 0.973 | 1.743 | 1.727 | 300–400 kN load | 59.67 | 68.88 | 9.21 | 105.2 | — | — | 1.727 | 1.701 | 400 kN constant load | 68.88 | 74.07 | 5.19 | 113.1 | | 0.941 | 1.701 | 1.686 | Water Saturated | 20–100 kN load | 0 | 21.27 | 21.27 | 32.5 | — | — | 1.901 | 1.839 | 100 kN constant load | 21.27 | 25.30 | 4.03 | 38.6 | | 0.996 | 1.839 | 1.827 | 100–200 kN load | 25.30 | 45.10 | 19.80 | 68.9 | — | — | 1.827 | 1.770 | 200 kN constant load | 45.10 | 53.19 | 8.09 | 81.2 | | 0.995 | 1.770 | 1.746 | 200–300 kN load | 53.19 | 64.26 | 11.07 | 98.1 | — | — | 1.746 | 1.714 | 300 kN constant load | 64.26 | 72.61 | 8.35 | 110.9 | | 0.995 | 1.714 | 1.690 | 300–400 kN load | 72.61 | 81.75 | 9.14 | 124.8 | — | — | 1.690 | 1.663 | 400 kN constant load | 81.75 | 91.00 | 9.25 | 138.9 | | 0.994 | 1.663 | 1.637 |
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Notes: ε is the accumulated strain of caved gangue specimen, ×10−3, t is the hold time in each constant load stage, min.
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