Ground investigation for gravity walls

Annex B.3 of Eurocode 7 Part 2 provides outline guidance on the depth of investigation points for retaining structures, as illustrated in Figure 11.1. (See Chapter 4 for guidance on the spacing of investigation points.)

The recommended minimum depth of investigation, za, for excavations where the groundwater table is below formation level is the greater of: za > 0.4h and za > (t + 2m)

Where the groundwater is above formation, za is the greater of: za > (H + 2m) and za > (t + 2m)

Above formation

Above formation

If all the strata encountered are impermeable, the depth of investigation should also satisfy: za > (t + 5m)

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