Engineering Geological Map of Lower Saxony 1 : 50 000 - Building land

Description

The Engineering Geological Map 1 : 50 000 (IGK50) is taken from the geological map 1 : 50,000 and shows the spatial distribution of the different types of subsoil at a depth of 2 m. Underlying layers cannot always be derived from the IGK50. For this purpose, the drilling database or the geoarchive of the LBEG can provide further data. Criteria and rules are used to establish relationships between the nature, composition and formation of the geological units and the load-bearing capacity as well as the risks of the subsoil as a subsoil. Different geological units with similar geotechnical properties were combined to form a subsoil type. For the removal of the structural loads into the subsoil, near-surface layers are of minor importance, because for a frost-free foundation a minimum embedding depth of the foundations of 0.8 m is required. Peat is a particularly risky subsoil that reacts to loads caused by structures or groundwater subsidence with heavy sacs. Minor overlays of 0 to 2 m are therefore only taken into account if it is peat, which in these cases is shaded. General information for start-up measures and, if necessary, further safety measures can be derived from the subsoil types and targeted project-related investigations can be planned. The soil groups according to DIN 18196 are specified for the respective subsoil types. The IGK50 cannot replace ground tests in accordance with DIN EN 1997-2 (DIN 4020). In the area of organic / biogenic (building ground type 3, e.g. peat), low-consolidated (building ground type 5, e.g. Klei, Auelehm) and non-cohesive (building ground types 10, 11, 12, e.g. sand, gravel) loose rocks, groundwater levels at the foundation level must generally be expected (abandonment of cellars or training of cellars with pressure water-containing insulation). For cohesive soils (building ground types 4, 5, 6, 7, 8, e.g. clay, silt), waterlogging from precipitation in the area of the excavation pit usually filled with better water-conducting material must be expected. There, the water is drained through suitable drainage systems. On the question of flood hazards, the "Geological Map of Lower Saxony 1 : 50 000 - Evaluation of flood risk" (GHG50) of the LBEG or information can be obtained from the lower water authority. A special geotechnical risk exists due to water-soluble rocks in the subsoil (deposits of Zechstein, Oberer Buntsandstein, Mittlerer Muschelkalk and Oberer Jura (Münder Mergel)). There, depressions and earthfalls can occur. Information on earthfalls and endangered areas is kept at the LBEG and is included in the "Map of Geohazards in Lower Saxony 1 : 25 000 - Earthfall and Subsidence Areas" (IGG25).

Resources

Name Format Description Link
0 https://nibis.lbeg.de/net3/public/ogc.ashx?NodeId=193&Service=WMS&Request=GetCapabilities&

Tags

  • opendata
  • inspireidentifiziert
  • sgd_ingenieurgeologie
  • nibis-metadaten

Topics

  • TECH

Categories