Eurocodice (EN 1997) > EN 1997 - 2 > Content of Eurocode 7-2 > Planning of ground investigations

2.4 Design investigations

2.4.1.3 Locations and depths of the investigation points

(2) When selecting the locations of investigation points, the following should be observed:

•the investigation points should be arranged in such a pattern that the stratification can be assessed across the site;

•the investigation points for a building or structure should be placed at critical points relative to the shape, structural behaviour and expected load distribution (e.g. at the corners of the foundation area);

•for linear structures, investigation points should be arranged at adequate offsets to the centre line, depending on the overall width of the structure, such as an embankment footprint or a cutting;

(2) When selecting the locations of investigation points, the following should be observed (continued):

•for structures on or near slopes and steps in the terrain (including excavations), investigation points should also be arranged outside the project area, these being located so that the stability of the slope or cut can be assessed.

•Where anchorages are installed, due consideration should be given to the likely stresses in their load transfer zone;

•the investigation points should be arranged so that they do not present a hazard to the structure, the construction work, or the surroundings (e.g. they may cause changes to the ground and groundwater conditions);

(2) When selecting the locations of investigation points, the following should be observed (continued):

•the area considered in the design investigations should extend into the neighbouring area to a distance where no harmful influence on the neighbouring area is expected;

•for groundwater measuring points, the possibility of using the equipment installed during the ground investigation for continued monitoring during and after the construction period should be considered.

(6) P The depth of investigations shall be extended to all strata that will affect the project or are affected by the construction.

•For dams, weirs and excavations below groundwater level, and where dewatering work is involved, the depth of investigation shall also be selected as a function of the hydro-geological conditions.

•Slopes and steps in the terrain shall be explored to depths below any potential slip surface.

NOTE: For the spacing of investigation points and investi- gation depths, the values given in Annex B.3 can be used as guidance.