Soil exchange

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A soil replacement (also soil replacement or soil replacement ) may be necessary if a stable foundation has to be carried out on non-load-bearing soil . In addition to the possibility of deep foundations , soil replacement is also suitable for soil layers with little thickness (thickness). Soil of greater thickness or the lack of a suitable replacement soil can greatly increase the costs of the soil replacement process and make it uneconomical.

Procedure

The unsound soil is excavated with an excavator or suction excavator . The stable material is then installed. It is important to ensure that the layers are compacted in layers and that there is sufficient storage density. In general, a layer should not be showered higher than 30 cm and have a Proctor density of ≥ 100%.

If a soil exchange is to be carried out below the groundwater level , compaction cannot take place in layers. In this case, deep compaction must be used or the missing soil must be filled with lean concrete .

Other methods

With certain soils (soft consistency and cohesive composition) an exchange can be dispensed with and a (road) embankment can be built directly. The weight of the dam pushes the unsound material to the side. It is important to ensure that the settlement is kept within limits, otherwise damage to the top of the dam can occur.

The bog blasting method is a special form of soil replacement . This method can only be used in soils with a high water content ( peat , bog ). In this case, the soil material is displaced during blasting.

The use of geosynthetics (e.g. geogrids ) is a particularly inexpensive alternative .

See also

swell