Table 4.
Factors and levels of experiment of Response Surface Analysis.
| Test factors | Factor level | ||
|---|---|---|---|
| − 1 | 0 | 1 | |
| A the sand-binder ratio of the backfill slurry | 4 | 6 | 8 |
| B the solid content of the backfill slurry (%) | 70 | 72 | 74 |
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