Description
This map was drawn up by Deltares for the Atlas of Natural Capital (2015).
Carrying capacity is defined as the degree to which a soil is insensitive to settlement (bags of the ground level) as a result of overloading by, for example, raising during preparation for construction, shallow-founded buildings, sand lanes for roads and dike bodies. Top load leads to compaction of the clay/peat pack, which compresses the soil and lowers the ground level. Setting is actually a factor in land subsidence. The term settlement is used here in relation to bearing capacity. Thus, the less sensitive an area for settlement is due to overload, the more load-bearing the subsoil there is, and therefore relatively more suitable for the construction of buildings and constructions. The good building soils are stable sandy soils with a lot of load-bearing capacity for constructions. Slack soils with a low load-bearing capacity, which are sensitive to settlement and in which (not well-founded) structures can sink, contain a lot of clay and peat.
The settlement card:
When an upper load is applied to the ground level, the underlying ground will be compressed. Top loads are, for example, embankments for site preparation, sand lanes for roads, dike bodies, but also shallow-founded buildings. The starting point is the assumption that the entire surface of the Netherlands will be raised with a 1 meter thick layer of uplift sand with a voluminous mass of 16 kN/m2. So it is a uniform load, edge effects are ignored. In each column of a 3D voxel ("volume pixel") model of the shallow subsurface (up to 20 m below ground level), a 1-dimensional settlement calculation is performed according to Koppejan's compression formula. This model, consisting of voxels of 100 * 100 * 0.5 m (l*b*h) is a geostatistical interpretation of all drillings present in the ‘Data and Information Dutch Subsurface’ (DINO). A simplified lithology is used: Sand, clay and peat are distinguished. These lithologies have been assigned compression properties, derived from Table 1 of the standard NEN 6740. The calculated setting after 40 years (theoretical end of the setting) was used to create a map image of the setting sensitivity. The results of the calculations are shown as a change in altitude compared to the current height of the ground level.
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https://geoservices.zuid-holland.nl/arcgis/services/Bodem/Bodem_bodemdaling/MapServer/WMSServer?request=GetCapabilities&service=WMS |