Net load–displacement estimation in soil-nail pullout tests

Hyung Joon 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.

Original languageEnglish
Article number1600185
Pages (from-to)534-547
Number of pages14
JournalProceedings of the Institution of Civil Engineers: Geotechnical Engineering
Volume170
Issue number6
DOIs
Publication statusPublished - 2017 Dec 1

Fingerprint

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

Keywords

  • Geotechnical engineering
  • Models (physical)
  • Slope – stabilisation

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Earth and Planetary Sciences (miscellaneous)

Cite this

Net load–displacement estimation in soil-nail pullout tests. / Seo, Hyung Joon; Pelecanos, Loizos; Kwon, Young Sam; Lee, In Mo.

In: Proceedings of the Institution of Civil Engineers: Geotechnical Engineering, Vol. 170, No. 6, 1600185, 01.12.2017, p. 534-547.

Research output: Contribution to journalArticle

Seo, Hyung Joon ; Pelecanos, Loizos ; Kwon, Young Sam ; Lee, In Mo. / Net load–displacement estimation in soil-nail pullout tests. In: Proceedings of the Institution of Civil Engineers: Geotechnical Engineering. 2017 ; Vol. 170, No. 6. pp. 534-547.
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