Research Article
Rock Load Estimation in Development Galleries and Junctions for Underground Coal Mines: A CMRI-ISM Rock Mass Rating Approach
Table 4
Estimated rock load for 3.6 m, 4.2 m and 4.8 m wide galleries and junctions.
|
Estimated rock load
(CMRI-ISM RMR) |
Estimated rock load
(best fit equation) | | | Gallery (t/m2) | Junction (t/m2) | Gallery (t/m2) | Junction (t/m2) | |
| | 1.8 | 2.8 | 2.1 | 2.9 |
For 3.6 m
wide
galleries | | 1.5 | 2.5 | 1.8 | 2.7 | | 1.5 | 2.6 | 1.7 | 2.6 | | 2.0 | 3.1 | 2.2 | 3.1 |
| | 1.8 | 2.8 | 1.7 | 2.6 |
For 4.2 m
wide
galleries | | 1.8 | 2.7 | 1.8 | 2.6 | | 1.9 | 2.8 | 1.9 | 2.8 | | 1.5 | 2.4 | 1.6 | 2.5 | | 1.8 | 2.7 | 1.8 | 2.6 | | 2.2 | 3.0 | 2.1 | 2.9 | | 1.4 | 2.1 | 1.8 | 2.7 | | 1.8 | 2.8 | 1.8 | 2.6 | | 3.4 | 4.2 | 3.3 | 4.0 | | 2.9 | 3.6 | 3.0 | 3.7 | | 3.4 | 4.1 | 3.4 | 4.1 | | 2.9 | 3.6 | 3.1 | 3.8 | | 3.1 | 3.8 | 3.0 | 3.8 | | 3.3 | 4.0 | 3.5 | 4.1 | | 3.0 | 3.7 | 3.1 | 3.8 | | 2.9 | 3.6 | 3.0 | 3.7 | | 3.1 | 3.9 | 3.0 | 3.8 | | 3.5 | 4.3 | 3.4 | 4.1 | | 3.0 | 3.7 | 3.1 | 3.8 | | 2.9 | 3.6 | 2.9 | 3.7 |
| | 3.2 | 3.5 | 3.1 | 3.6 |
For 4.8 m
wide
galleries | | 3.2 | 3.6 | 3.3 | 3.7 | | 3.2 | 3.6 | 3.4 | 3.8 | | 3.3 | 3.8 | 3.3 | 3.7 | | 1.5 | 2.2 | 1.9 | 2.7 | | 2.8 | 3.6 | 2.3 | 2.9 | | 2.4 | 3.0 | 2.2 | 2.9 | | 1.7 | 2.4 | 1.8 | 2.6 |
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