The procedure for setting up the 45 soil columns was as follows: Soil material containing a high proportion of loess from the illuvial horizon of a soil that has undergone clay translocation during its formation (“Parabraunerde”, “Sol lessivé”, “Alfisol”) is homogenized (site of sampling near Feldbergen, Brunswick region, Germany).The material is filled in a dry state into a glass tube lined with paperboard (diameter and height of the soil column approximately 9 cm).The column is very slowly saturated with water from below and subsequently dried at 105 °C.After removal of the hard soil core from the glass tube, the soil column is burned in a kiln at temperatures rising to a final level of 600 °C, whereby already some voids develop. (The nil test variants were dried slowly and at a lower temperature to prevent the formation of fissures.) The burning prevented a swelling of the soil material during the experimental runs.After wrapping the soil columns with wire, further voids are created by driving small nails into the outside surface of the columns.The wire wrapping is removed in sections and the soil column is coated with silicon rubber and tape.A cylinder with an overflow as well as a base plate made of coarsely woven plastic fibre and wire mesh are fixed to the soil columns with silicon rubber and sealed with putty.
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- Experimental Studies
Professor Dr.-Ing. Heiko Diestel
- Springer Berlin Heidelberg