Table 7 Data comparison.
Groups | Schemes | Changes in effective sections | Pre-P5max/kPa | P5max/kPa |
|---|---|---|---|---|
Experimental group I | 1 | Unchanged | 41 | 32.3 |
2 | Smaller | 31.2 | 35.9 | |
3 | Larger | 53 | 47.3 | |
Experimental group II | 4 | Unchanged | 55 | 48.6 |
5 | Smaller | 41.4 | 49.5 | |
6 | Larger | 82 | 72.7 | |
Experimental group III | 7 | Unchanged | 69 | 65.6 |
8 | Smaller | 60.8 | 71.4 | |
9 | Larger | 96 | 93.6 |
