Ground investigation for embedded 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 12.1. (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:

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

If H is small and t under-estimated, there is a danger that the latter rule will result in an investigation that does not go deep enough. It therefore seems advisable to ensure also that za > 0.4h.

Above ^ excavation

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