American Society of Civil Engineers


Vertical Uplift Resistance of a Group of Two Coaxial Anchors in Clay


by Jyant Kumar, (corresponding author), (Professor, Dept. of Civil Engineering, Indian Institute of Science, Bangalore 560012, India. E-mail: jkumar@civil.iisc.ernet.in) and Jagdish Prasad Sahoo, (Research Scholar, Dept. of Civil Engineering, Indian Institute of Science, Bangalore 560012, India. E-mail: jagdish@civil.iisc.ernet.in)

Journal of Geotechnical and Geoenvironmental Engineering, Vol. 138, No. 3, March 2012, pp. 419-422, (doi:  http://dx.doi.org/10.1061/(ASCE)GT.1943-5606.0000599)

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Document type: Technical Note
Abstract: The vertical uplift resistance for a group of two horizontal coaxial rigid strip anchors embedded in clay under undrained condition has been determined by using the upper bound theorem of limit analysis in combination with finite elements. An increase of undrained shear strength of soil mass with depth has been incorporated. The uplift factor F has been computed. As compared to a single isolated anchor, a group of two anchors provides greater magnitude of the uplift resistance. For a given embedment ratio, the group of two anchors generates almost the maximum uplift resistance when the upper anchor is located midway between ground surface and the lower anchor. For a given embedment ratio, F increases linearly with an increase in the normalized unit weight of soil mass up to a certain value before attaining a certain maximum magnitude; the maximum value of F increases with an increase in embedment ratio.


ASCE Subject Headings:
Anchors
Clays
Failures
Finite element method
Limit analysis
Optimization

Author Keywords:
Anchors
Clays
Failure
Finite elements
Limit analysis
Optimization