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Title: Investigation on stress variation in soil surrounding a soil nail during installation and pull-out
Authors: Su, LJ
Liao, HJ
Yin, JH 
Keywords: Finite elements
Normal stress
Pull-out strength
Soil nail
Issue Date: 2011
Publisher: 岩土力學編輯部
Source: 岩土力學 (Rock and soil mechanics), 2011, v. 32, no. SUPPL. 1, p. 124-128 How to cite?
Journal: 岩土力學 (Rock and soil mechanics) 
Abstract: Pull-out strength of a soil nail is an important parameter in the design of a soil nailing system. The pull-out strength is determined by the normal stress acting on the soil nail surface during pull-out. The variation of normal stress in soil surrounding a drill-and-grout soil nail during drilling, grouting and pull-out is studied through both laboratory pull-out tests and numerical simulation. It is found that for a drill-and-grout soil nail, most of the normal stress in the soil surrounding the hole is released after drilling. For a soil nail grouted under low pressure, the normal stress does not substantially recover after the nail is installed. During pull-out, the normal stress acting on the nail increases with the increase in pull-out distance because of the constrained dilatancy of the soil surrounding the nail, which eventually increases the pull-out resistance. It is indicated that the dilatancy of the soil is very important to a drill-and-grout soil nail. For soils with low dilatancy, further measures, such as high pressure grouting should be employed to compensate the released stress during drilling.
ISSN: 1000-7598
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