Research Article
Corrosion Investigation of Rock Anchors Served over 10 Years in Underground Powerhouse of a Hydropower Station
Table 9
Exposure ratings of the anchor head structure.
| | Position | Quantity (pcs.) | Structure exposure ratings | | A | B | C | D |
| | Upstream sidewall | 27 | 5 | 14 | 7 | 1 | | Downstream sidewall | 28 | 5 | 12 | 7 | 4 | | Left-end wall | 8 | 3 | 2 | 2 | 1 | | Right-end wall | 10 | 2 | 4 | 3 | 0 | | Arch crown | 81 | 3 | 73 | 5 | 0 | | Total | 154 | 18 | 105 | 24 | 7 | | Percent | 100.00% | 11.69% | 70.13% | 15.58% | 4.55% |
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