Subsoil - Soil liquefaction potential German North Sea
Description
The Soil Liquefaction Potential map presents information on the distribution of sediments at the seabed surface, which due to their specific grain size distributions, may be prone to soil liquefaction under external load effects (development of excess pore water pressure). The sediments are usually narrowly graded coarse silt to medium sands. The effect of soil liquefaction can be important for construction measures and structures, such as pipelines and submarine cables on the seabed. The map covers the area of the entire German North Sea at 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 the results of the evaluation of drilling data at depths of 1 m and 2 m below the seabed. The maps are based on sediment samples from the seabed surface down to a depth of 0.2 m as well as layer descriptions from drillings in the above-mentioned depth ranges, which were available until April 2012. The unconsolidated 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). Based on the grain size analyses carried out in the laboratory, the layer descriptions from boreholes and the grain sorting, the sediments are classified on the basis of the classification of STUDER & KOLLER (1997). The legend includes two classes, soil liquefaction "potentially possible" and "not expected".
Resources
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Description |
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https://download.bgr.de/bgr/geologie/GPDN-Baugrund/Bodenverfluessigungspotenzial/shp/GIS-Shapes_Bodenverfl%C3%BCssigung_Karte_V1_GK3-Koordinaten.zip |
Tags
- geopotenzial-deutsche-nordsee
- geologie
- korngrößenverteilung
- geoldg
- bodenverflüssigung
- geotechnik
- baugrund
- gpdn