Research Article
Sep 1978
Load Transfer in Pressure Injected Anchors
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VIEW THE REPLYAuthors: David R. Shields, Harry Schnabel Jr., M.ASCE, and David E. Weatherby, AM.ASCEAuthor Affiliations
Publication: Journal of the Geotechnical Engineering Division
Volume 104, Issue 9
Abstract
Two instrumented pressure injected (grouted) soil anchors were installed as part of tied-back excavation support systems in dense sands. Strain gages were used to determine the distribution of load in the anchors during load testing and subsequent excavation. Relationships between load transfer (slope of the load distribution curve) and anchor displacement are constructed from the strain gage data. The magnitude of anchor displacement required to mobilize high values (10 to 25 kip/ft) of load transfer is very small, on the order of 0.1 in. (2.54 mm). Concentration of load transfer near the front of the anchors results from the dependence of load transfer mobilization on anchor displacement. During unloading, residual loads (and strains) are locked into the anchor by a shear stress reversal near the front of the anchor. Following lock-off, load tends to increase towards the back of the anchor with time. The majority of this load redistribution appeared to be in response to strains induced in the soil mass by excavation, rather than relaxation in the soil-anchor system.
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Information
Published In
Journal of the Geotechnical Engineering Division
Volume 104 • Issue 9 • September 1978
Pages: 1183 - 1196
Copyright
© 1978 American Society of Civil Engineers.
History
Published in print: Sep 1978
Published online: Feb 11, 2021
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Authors
Affiliations
David R. Shields
Fellow, Dept. ofCiv. Engrg., Univ. of Illinois at Urbana-Champaign, Urbana, Ill
Harry Schnabel Jr., M.ASCE
Pres., Schnabel Foundation Co., Bethesda, Md
David E. Weatherby, AM.ASCE
Mgr., Research and Development, Schnabel Foundation Company, Bethesda, Md
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ASCE Library Cards let you download journal articles, proceedings papers, and available book chapters across the entire ASCE Library platform. ASCE Library Cards remain active for 24 months or until all downloads are used. Note: This content will be debited as one download at time of checkout.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.