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Vertical Pullout Capacity of a Group of Helical Screw Anchors in Sand: An Empirical Approach

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Abstract

In this paper experimental investigations on the behavior of a group of single, double and triple helical screw anchors under the influence of vertical uplift loads are presented. The testing program were conducted on one, two, three and four numbers of anchors in sand for different depths of embedment keeping shallow and deep mode of behavior in mind. It was observed that the pullout load varied significantly with the installation depth of the anchor and the number of anchors. It had been shown that the load displacement relationships for all groups may be reduced to a common curve. The graphs of ultimate pullout capacity a group of two, three and four numbers of anchors with respect to one anchor were plotted and design equations had been proposed to design a group of anchors based on ultimate pullout capacity of one anchor.

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Abbreviations

H:

Depth of the bottom of the anchor from the soil surface (m)

B:

Diameter of the helical screw of the anchor (m)

d:

Diameter of the screw of the anchor

s:

Spacing between the anchors

m:

Constant (=0.95)

Na :

Number of anchors

nb :

Number of screw blades in the anchor

(Qup)1 :

Ultimate pullout capacity of one number of helical screw anchors

(Qup)2 :

Ultimate pullout capacity of two numbers of helical screw anchors

(Qup)3 :

Ultimate pullout capacity of three numbers of helical screw anchors

(Qup)4 :

Ultimate pullout capacity of four numbers of helical screw anchors

Φ:

Angle of internal friction of the soil used

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Acknowledgments

The research is supported by a fellowship to second author from MHRD, Govt. of India. This support is gratefully acknowledged.

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Authors and Affiliations

  1. Department of civil Engineering, Indian Institute of Technology, Roorkee, 247667, India

    Satyendra Mittal & Sanjeev Mukherjee

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  1. Satyendra Mittal
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  2. Sanjeev Mukherjee
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Correspondence to Sanjeev Mukherjee.

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Mittal, S., Mukherjee, S. Vertical Pullout Capacity of a Group of Helical Screw Anchors in Sand: An Empirical Approach. Indian Geotech J 44, 480–488 (2014). https://doi.org/10.1007/s40098-014-0099-1

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