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http://dx.doi.org/10.7843/kgs.2011.27.6.017

Tension Force Monitoring of Tension Type Ground Anchor Using Optical FBG Sensors  

Sung, Hyun-Jong (Dept. of Civil & Environmental Engrg., Chonnam National Univ.)
Kim, Young-Sang (Dept. of Marine & Civil Engrg., Chonnam National Univ.)
Kim, Jae-Min (Dept. of Marine & Civil Engrg., Chonnam National Univ.)
Park, Gui-Hyun (Dept. of Civil & Environmental Engrg., Chonnam National Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.27, no.6, 2011 , pp. 17-26 More about this Journal
Abstract
Ground anchor method is one of the most popular reinforcing technology in Korea. For the sound monitoring of slope reinforced by permanent anchor for a long period, monitoring the tension force of ground anchor is very important. However, special technology except conventional load cell has not been developed for this purpose. In this paper, a new method is described to replace the conventional strain gauge and V.W. type load cell which has been commonly used as a prestress force monitoring tool for a short-term and long-term. Four 11.5 m long strain detectable tension type anchors were made using FBG sensor embedded tendon since FBG sensor is smaller than strain gauge type load cell and does not have noise from electromagnetic wave. Each two set strain detectable tension type anchors were installed into the different ground conditions, i.e., soft rock and weathered granite soil. Prestress force of ground anchor was monitored during the loading-unloading step from in-situ pullout test using proposed FBG sensor embedded in the tendon and the conventional load cell Test results show that the prestress force monitored from FBG sensor may well be used practically, for it almost matches with that measured from expensive load cell.
Keywords
FBG sensor; Tendon, Ground anchor; Long-term monitoring; Short-term monitoring;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
연도 인용수 순위
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