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Technical paper: Long-term performance of high capacity rock anchors at Devonport

GS Littlejohn, BSc(Eng), PhD, CEng, MICE, MIStructE, FGS, and DA Bruce, BSc, PhD, FGS. This paper was first published in GE’s October 1979 edition.


With the steady development of ground anchor technology over the years, there has been an increasing awareness of the need to obtain and provide information concerning long-term performance of post tensioned anchors.

The present authors (1977) have written of the benefits to be gained from such data; the engineer being able to “feed back” performance observations into future designs and thereby optimise such parameters as overload allowances and safety factors; the prospective client being accurately and confidently informed of how anchors installed at his expense will perform after installation. Furthermore, such data collection permits all parties to judge at the earliest possible stage whether anchors being monitored are, in fact, acting satisfactorily. On a more general front, this form of monitoring may permit correlation of anchor load and structural movement, which will lead to a better understanding of anchor/ground/structure interaction. 

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