Net load‐displacement estimation in soil‐nailing pullout tests

Hyungjoon Seo, Loizos Pelecanos, Young-Sam Kwon, In-Mo Lee

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Soil-nails are used to stabilise a soil mass by exploiting the resistance generated by the skin friction between the ground and grout and the tensile stiffness of the reinforcing material. A load–displacement curve is obtained from in situ pullout load tests performed by considering the elastic shear modulus and ultimate skin friction capacity between the soil and grout. This study determines the shear behaviour between the soils and grout analytically, especially the soil-dilation effect during shearing that is one of the main factors affecting the ultimate skin friction, even though this estimation is rather cumbersome. Many studies assume a full bond between the grout and the steel reinforcing bar, thus neglecting their relative displacement. In this study, the net load–displacement between the ground and grout is obtained by subtracting the nail elongation from the load–displacement of the pullout tests when estimating the shear displacement. Numerous field pullout tests are performed in this study under various ground conditions and through various construction methods. The dilatancy angles are estimated dependent on the soil type by comparing the net load–displacement curve obtained in the field with that obtained theoretically.
LanguageEnglish
Pages534-547
Number of pages17
JournalProceedings of the Institution of Civil Engineers - Geotechnical engineering
Volume170
Issue number6
Early online date14 Jun 2017
DOIs
StatusPublished - 31 Dec 2017

Fingerprint

pullout test
soil nailing
grout
Soils
Skin friction
skin
Nails
friction
soil
Loads (forces)
construction method
ground conditions
dilatancy
dilation
shear modulus
Shearing
stiffness
soil type
Elongation
Elastic moduli

Cite this

Net load‐displacement estimation in soil‐nailing pullout tests. / Seo, Hyungjoon; Pelecanos, Loizos; Kwon, Young-Sam; Lee, In-Mo.

In: Proceedings of the Institution of Civil Engineers - Geotechnical engineering, Vol. 170, No. 6, 31.12.2017, p. 534-547.

Research output: Contribution to journalArticle

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