Remedial Measures for Existing Anchored Slopes in Taiwan
Publication: Journal of Performance of Constructed Facilities
Volume 33, Issue 3
Abstract
This paper presents the results obtained from an island-wide investigation program for anchored slopes alongside freeways, highways, and railways in Taiwan. The investigation procedures include the visual inspection of anchor protection caps and anchorage head components, borescope inspection of strands under anchorage heads, and lift-off test to determine residual anchor loads. It was found that groundwater and corrosion were the common problems associated with ground anchors. Immediate measures were taken to backfill cavities under anchorage heads to prevent further corrosion on existing anchors. The upper and lower bounds of the remaining capacity of existing anchors was assessed using a t-distribution statistical method; also, if necessary, extra anchors with better corrosion protection were installed to restore the degraded stability of slope due to anchor corrosion. A low-cost smart anchor capable of self-detecting load changes is also proposed. Use of such smart anchors will allow the anchor load changes on a slope to be monitored on a large scale over an extended period of time and provide needed anchor information for assessing the future stability of anchored slopes.
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Acknowledgments
The authors wish to thank the Ministry of Transportation and Communication of the Taiwanese government for supporting an independent investigation of the landslide on Freeway 3. The authors thank the Directorate General of Highways and the National Freeway Bureau for providing the financial support and test sites to perform the experiments on ground anchors and the inspection results from many anchored slopes in Taiwan. The authors also wish to thank the local ground anchor contractors and engineers who performed the inspection and remediation work on numerous anchored slopes.
References
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Published In
Journal of Performance of Constructed Facilities
Volume 33 • Issue 3 • June 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: May 8, 2018
Accepted: Nov 1, 2018
Published online: Feb 28, 2019
Published in print: Jun 1, 2019
Discussion open until: Jul 28, 2019
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