A Long-Term Monitoring Method of Corrosion Damage of Prestressed Anchor Cable

Abstract

Based on high-stress characteristics of prestressed anchor cables, this paper develops an axial-distributed testing method to test corrosion damage of prestressed anchor cables. The positioning accuracy and corrosion range of an axial-distributed optical fiber sensor is studied, and its mathematical model between corrosion mass loss and axial fiber strain is established. The experimental results show that the fiber strain from an axial-distributed sensor enables one to reflect the corrosion rate along a prestressed anchor. Moreover, it has a greater sensitivity when an anchored cable has a higher stress. The mathematical model between corrosion mass loss and axial fiber strain is determined to be ε=4723.64ρ+2592.95. The corrosion location along the anchor cable is characterized by axial fiber strain. Therefore, this work provides an insight for cable corrosion.

Review of Sensor-Based Subgrade Distress Identifications

“…Earth pressure box [102][103][104][105][106][107] Distributed optical fiber [108][109][110] Anchor point failure Distributed optical fiber [111][112][113][114][115] The failure distress of the anchorage point of a subgrade retaining structure refers to the phenomenon that the anchorage point in a subgrade retaining structure is damaged or failed. Anchorage points are usually used to fix subgrade retaining structures to resist the thrust and lateral force of soil.…”

“…Il-Bumkon and Yong-seokkon et al [113,114] put forward a method to monitor the anchorage force by measuring the strain field on the bearing plate with distributed optical fiber sensors and, through experiments, showed that the anchorage force has a great correlation with the strain distribution on the bearing plate. Li Jianzhi et al [115] Figure 13. Site construction of the anti-slide pile (figures are reproduced from Wei et al [110]).…”

“…Il-Bumkon and Yong-seokkon et [113,114] put forward a method to monitor the anchorage force by measuring the strain field on the bearing plate with distributed optical fiber sensors and, through experiments, showed that the anchorage force has a great correlation with the strain distribution on the bearing plate. Li Jianzhi et al [115] developed an axial distribution test method based on the high-stress characteristics of prestressed anchor cables and used distributed optical fibers to test the corrosion damage to prestressed anchor cables. Figure 14 shows the distributed optical fiber layout.…”