Research Article

Corrosion Investigation of Rock Anchors Served over 10 Years in Underground Powerhouse of a Hydropower Station

Table 5

Investigation record of anchor heads on left-end wall of the tailrace surge chamber.

No.Position (left-end wall)EnvironmentDescription of rust corrosion

WZ-1-1Elevation 1272.00X 0 + 123.5DryThe protective cap is exposed and free from damage, and it has obvious rust marks, however, the rest of the parts are covered well
WZ-1-2Elevation 1272.00X 0 + 128.0DryThe protective cap is exposed partially and free from damage, and it has obvious rust marks, however, the rest of the parts are covered well
WZ-1-3Elevation 1272.00X 0 + 132.5DryThe mortar layer is basically integral and has cracks, however, the anchor head structure is not exposed
WZ-2-1Elevation 1267.50X 0 + 123.5DryThere is no protective cap, the ends of the small pat and the cable body are exposed locally, the exposed part is obviously rusted, and the rest of the parts are covered by mortar well
WZ-2-2Elevation 1267.50X 0 + 128.0DryIntegral mortar layer
WZ-2-3Elevation 1267.50X 0 + 132.5DryThe mortar layer is basically integral and has cracks, however, the anchor head structure is not exposed
WZ-3-1Elevation 1265.30X 0 + 125.9DryThe whole anchor head is exposed, and there is mortar between cable bodies. The pad and exposed cable body have obvious rust marks
WZ-3-2Elevation 1265.30X 0 + 130.4DryThe whole anchor head is exposed, the pad has obvious rust marks, and the mortar layer at the ends of the cable body is integrate