Location
Arlington, Virginia
Date
14 Aug 2008, 2:15pm - 4:00pm
Abstract
The first presented case history is the construction of a new federal road south of Berlin, Germany. An embankment has been designed to cross a region of very soft peat soil with underlying organic silt, sand and boulder clay, with a total length of about 140 m. Ground improvement using sand columns with a diameter of 0.6 m and a distance of 1.5 m were designed and applied to all regions with more than 2.5 m thickness of the organic soil layer. Geogrids were used in addition to the vertical sand columns to take into account the action of horizontal forces beneath the embankment. The measured settlements as well as the tensile strains in the geogrids show the significant creep behaviour of organic soils over very long periods of time. The second case history is the renewal and enlargement of a federal expressway resting on very soft organic soils. Extensive laboratory tests as well as a large scale model test in a geotechnical testing pit using in situ excavated organic silt have been done to investigate the soilcolumn interaction behaviour in more detail. The data confirm that the long term deformations of the organic soils are mainly influenced by the creep behaviour of these soils.
Department(s)
Civil, Architectural and Environmental Engineering
Meeting Name
6th Conference of the International Conference on Case Histories in Geotechnical Engineering
Publisher
Missouri University of Science and Technology
Document Version
Final Version
Rights
© 2008 Missouri University of Science and Technology, All rights reserved.
Creative Commons Licensing
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Document Type
Article - Conference proceedings
File Type
text
Language
English
Recommended Citation
Savidis, Stavros A.; Rackwitz, Frank; and Schüßler, Maik, "Design and Construction of Granular Soil Columns for Ground Improvement of Very Soft Soils for Road Embankments" (2008). International Conference on Case Histories in Geotechnical Engineering. 12.
https://scholarsmine.mst.edu/icchge/6icchge/session07/12
Design and Construction of Granular Soil Columns for Ground Improvement of Very Soft Soils for Road Embankments
Arlington, Virginia
The first presented case history is the construction of a new federal road south of Berlin, Germany. An embankment has been designed to cross a region of very soft peat soil with underlying organic silt, sand and boulder clay, with a total length of about 140 m. Ground improvement using sand columns with a diameter of 0.6 m and a distance of 1.5 m were designed and applied to all regions with more than 2.5 m thickness of the organic soil layer. Geogrids were used in addition to the vertical sand columns to take into account the action of horizontal forces beneath the embankment. The measured settlements as well as the tensile strains in the geogrids show the significant creep behaviour of organic soils over very long periods of time. The second case history is the renewal and enlargement of a federal expressway resting on very soft organic soils. Extensive laboratory tests as well as a large scale model test in a geotechnical testing pit using in situ excavated organic silt have been done to investigate the soilcolumn interaction behaviour in more detail. The data confirm that the long term deformations of the organic soils are mainly influenced by the creep behaviour of these soils.
