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Behaviour of Group of Helical Screw Anchors Under Compressive Loads

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Abstract

In this paper experimental investigations on the behaviour of single, double and triple helical screw anchors under the influence of vertical compressive loads are presented. The testing program was conducted on one, two, three and four numbers of model anchors in sand for different depths of embedment keeping shallow and deep mode of behaviour in mind. The experimental setup was instrumented to measure the compressive load and the downward displacement of the anchor. It was observed that the compressive load varied significantly with the installation depth of the anchor and the number of anchors. Based on experimental results, non-dimensional graphs were plotted normalizing the deformation and load axis both and simple equations are proposed correlating load and deformation. Ultimate compressive capacity of multiple anchors was plotted against that of single anchor and simple equations were proposed correlating them. Using these equations an anchor foundation for a particular structure can be easily designed. A 3-D finite element model, PLAXIS, was used to confirm the results obtained from laboratory tests and the agreement is excellent.

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Abbreviations

B:

Diameter of the blade of the helical screw anchor

E:

Young’s modulus of elasticity

H:

Embedment depth of the anchor

N:

Newton

Na :

Number of anchors

nb :

Number of blades in the helical screw anchor

L:

Embedded length of the anchor

Q:

Failure load

Quc :

Ultimate compressive capacity of helical screw anchor

(Quc)1 :

Ultimate compressive capacity of one helical screw anchor

(Quc)2 :

Ultimate compressive capacity of two helical screw anchors

(Quc)3 :

Ultimate compressive capacity of three helical screw anchors

(Quc)4 :

Ultimate compressive capacity of four helical screw anchors

P:

Pressure

z:

Depth of the sand fills above the screw of the anchor

f*:

Apparent coefficient of friction between the anchor and the soil

G:

Specific gravity

c:

Cohesion

emin :

Minimum void ratio

emax :

Maximum void ratio

Cu :

Uniformity coefficient

Cc :

Coefficient of curvature

q:

Surcharge intensity

Φ:

Angle of internal friction

γd :

Dry unit weight of soil

γmin :

Minimum unit weight (kN/m3)

γmax :

Maximum unit weight (kN/m3)

ν:

Poisson’s ratio

References

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Acknowledgments

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

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Authors and Affiliations

  1. Deptartment of Civil Engineering, Indian Institute of Technology Roorkee, Roorkee, 247667, India

    Satyendra Mittal & Sanjeev Mukherjee

Authors
  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. Behaviour of Group of Helical Screw Anchors Under Compressive Loads. Geotech Geol Eng 33, 575–592 (2015). https://doi.org/10.1007/s10706-015-9841-4

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  • DOI: https://doi.org/10.1007/s10706-015-9841-4

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