Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/17922
Title: Influence of degree of saturation on soil nail pull-out resistance in compacted completely decomposed granite fill
Authors: Su, LJ
Chan, TCF
Shiu, YK
Cheung, T
Yin, JH 
Keywords: Completely decomposed granite fill
Degree of saturation
Pull-out shear strength
Soil nailing
Issue Date: 2007
Publisher: NRC Research Press
Source: Canadian geotechnical journal, 2007, v. 44, no. 11, p. 1314-1328 How to cite?
Journal: Canadian geotechnical journal 
Abstract: The nail-soil interface shear strength is a key parameter in the design and stability assessment of soil nailing systems. A number of factors will influence the nail-soil interface shear strength. Among these factors, the degree of saturation (Sr) of the soil is an important one especially for permanent soil nail structures. To study the influence of Sr on soil nail pull-out shear resistance, a series of laboratory pull-out tests have been conducted on soil nails in compacted completely decomposed granite (CDG) fill prepared to different Sr. The tests were conducted using two specially designed pull-out boxes (with same specifications). In the near-saturated tests, a high Sr (about 98%) was achieved using two special features of the apparatus: a waterproof front cap and back-water pressure pipes at the bottom of the pull-out box. Test results showed that the nail-soil shearing plane migrated outwards into the soil when the Sr of the soil increased. Also, peak pull-out strengths of soil nails were strongly influenced by the Sr of the soil. Among the tested Sr, the highest values of peak pull-out shear strength were obtained at Sr values between 50% and 75%.
URI: http://hdl.handle.net/10397/17922
ISSN: 0008-3674
DOI: 10.1139/T07-056
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