Geotechnical classification of sediments – Soil liquefaction – Seabed sediments with grain size distributions prone to soil liquefaction under action
Card up to 0.2m GOK
Description
The map Soil liquefaction potential presents information on the distribution of sediments on the seabed surface, which may be prone to soil liquefaction due to their specific particle size distributions under external load effect (creation of pore water overpressure). The sediments are usually narrowly graded coarse silt to medium sands. The effect of soil liquefaction can be important in construction projects and structures, such as pipelines and submarine cables on the seabed.
The map covers the area of the entire German North Sea on a scale of 1: 250,000 with a statement on the sediments of the upper 0.2 m from the seabed surface. Two additional maps show results from the evaluation of drilling data at depths of 1 m and 2 m below the seabed. The map is based on sediment samples of the seabed surface up to a depth of 0.2 m and strata descriptions of drilling in the above-mentioned depth areas, which were available until April 2012. The basic data are stored in databases at the BSH and LBEG, and data collected in the future will be integrated into them.
The loose sediments are classified according to their grain sizes according to DIN EN 14688-1: clay (grain size <0.002 mm); silt (grain size 0.002 to 0.063 mm); sand (grain size 0.063 to 2.0 mm); gravel (grain size 2.0 to 63 mm); Stones and blocks (grain size >63 mm). The sediments are classified on the basis of the classification by STUDER & KOLLER (1997) on the basis of the grain size analyses carried out in the laboratory, the layer descriptions from boreholes and the grain sorting. The legend includes two classes, soil liquefaction ‘potentially possible’ and ‘not to be expected’.
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https://nibis.lbeg.de/net3/public/ogc.ashx?NodeId=2337&Service=WMS&Request=GetCapabilities& |