Research Article
Experimental and Theoretical Investigation of Overburden Failure Law of Fully Mechanized Work Face in Steep Coal Seam
Table 3
The proportioning parameters of similar materials.
| | Num | Lithology | Materials | Ratio (aggregate: cementing material) | Ratio (gypsum: cement) |
| | 1 | Siltstone | Sand: gypsum: cement | 8.5 : 1.5 | 9 : 1 | | 2 | Medium sandstone | Sand: gypsum: cement | 7.5 : 5 | 8.5 : 1.5 | | 3 | Siltstone | Sand: gypsum: cement | 8.5 : 1.5 | 9.5 : 0.5 | | 4 | Sandy mudstone | Sand: gypsum: cement | 8.5 : 1.5 | 9 : 1 | | 5 | Coal seam #6 | Coal is mixed with water and compacted | | 6 | Medium sandstone | Sand: gypsum: cement | 7.5 : 5 | 8.5 : 1.5 | | 7 | Sandy mudstone | Sand: gypsum: cement | 8.5 : 1.5 | 9 : 1 | | 8 | Siltstone | Sand: gypsum: cement | 8 : 2 | 8.5 : 1.5 |
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