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http://dx.doi.org/10.7843/kgs.2009.25.10.5

Uplift Capacity Estimation of Bond-type Rock Anchors Based on Full Scale Field Tests  

Kim, Dae-Hong (KEPRI / KEPCO)
Oh, Gi-Dae (KEPRI / KEPCO)
Publication Information
Journal of the Korean Geotechnical Society / v.25, no.10, 2009 , pp. 5-15 More about this Journal
Abstract
This paper presents the results of full-scale uplift load tests performed on 24 passive anchors grouted to various lengths at Okchun and Changnyong site. Rock anchors were installed over a wide range of rock types and qualities with a fixed anchored depth of 1~6 m. The majority of installations used D51 mm high grade steel rebar to induce rock failure prior to rod failure. However, a few installations included the use of D32 mm rebar at relatively deeper anchored depth so as to induce rod failure. In many tests, rock failure was reached and the ultimate loads were recorded along with observations of the shape and extent of the failure surface. In addition to field tests, laboratory pullout tests were conducted to determine bond strength and bond stress-shear slip relation at the tendon/grout interface when a corrosion protection sheath is installed in the cement-based grout. The test results show that the ultimate tendon-grout bond strength is measured from 18~25% of unconfined compressive strength of grout. One of the important results from these tests is that the measured strains along the corrosion protection sheath were so small that practically the reduction of bond strength by the presence of sheath would be negligible.
Keywords
Bond strength; Failure mechanism; Rock anchor; Rock mass; Transmission tower foundation; Uplift capacity;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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