Ground investigation for anchorages

Annex B.3 of Eurocode 7 Part 2 provides outline guidance on the depth of investigation points for the principal types of geotechnical structure, but does not give direct guidance on the spacing or depth of investigation points for anchorages.

Since anchorages are used in conjunction with other structures, e.g. slopes, retaining walls, holding down basements, etc., the scope of investigation is governed by the structure that the anchorages help to stabilize. The properties of the ground should be investigated over the full length of the anchor, thereby enabling pull-out resistance to be adequately assessed.

EN 15371 provides some guidance on ground investigations for anchorage design but adds little to the advice given in Eurocode 7 Part 2.2 The corrosion potential of the ground and the existence of stray electric currents are given particular prominence since the long-term performance of an anchorage is largely governed by corrosion. In addition, because anchors are normally installed at inclinations close to horizontal, lateral variation in ground conditions as well as ground conditions outside the site boundary may be of concern.

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