Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Reinforcing foundation layers on soft subgrade
The aim of the research project on the 'Design of Geosynthetic Reinforcement' is to develop guidelines for the design of serviceability and ultimate limit states. Field tests on a 1:1 scale concentrated on questions relating to the improvement of the compaction properties and long-term bearing capacity of foundation layers on a soft subgrade rein-forced with geosynthetics. Ten different geosynthetics were tested for the reinforcement layer. These included five geogrids, one geocomposite, two nonwoven geotextiles and two slit tape woven geotextiles. A site in a brick clay mining pit was available for the test track. The subgrade consisted of a clayey silt with a very low load-bearing capacity. The test track was built with three 0.2 m thick layers. The first of these was statically compacted, the second and third were dynamically compacted. Loose recycled material (crushed concrete) was used to build the foundation layers. The state of the track was monitored from installation to removal, focusing on static plate compression tests and profile measurements to assess the formation of ruts. The geogrids were instrumented to measure the strains. The results show that geosynthetic reinforcement only has an effect on a soft subgrade (CBR coefficient < 3 %), which allows the geosynthetic to deform, thus mobilising tensile forces.
Reinforcing foundation layers on soft subgrade
The aim of the research project on the 'Design of Geosynthetic Reinforcement' is to develop guidelines for the design of serviceability and ultimate limit states. Field tests on a 1:1 scale concentrated on questions relating to the improvement of the compaction properties and long-term bearing capacity of foundation layers on a soft subgrade rein-forced with geosynthetics. Ten different geosynthetics were tested for the reinforcement layer. These included five geogrids, one geocomposite, two nonwoven geotextiles and two slit tape woven geotextiles. A site in a brick clay mining pit was available for the test track. The subgrade consisted of a clayey silt with a very low load-bearing capacity. The test track was built with three 0.2 m thick layers. The first of these was statically compacted, the second and third were dynamically compacted. Loose recycled material (crushed concrete) was used to build the foundation layers. The state of the track was monitored from installation to removal, focusing on static plate compression tests and profile measurements to assess the formation of ruts. The geogrids were instrumented to measure the strains. The results show that geosynthetic reinforcement only has an effect on a soft subgrade (CBR coefficient < 3 %), which allows the geosynthetic to deform, thus mobilising tensile forces.
Reinforcing foundation layers on soft subgrade
Verstärkung von Gründungsschichten über weichem Boden
Hufenus, R. (Autor:in) / Rüegger, R. (Autor:in) / Weingart, K. (Autor:in) / Banjac, R. (Autor:in) / Mayor, P. (Autor:in) / Springman, S.M. (Autor:in) / Brönnimann, R. (Autor:in) / Feltrin, G. (Autor:in)
2004
6 Seiten, 15 Bilder, 2 Tabellen, 9 Quellen
Aufsatz (Konferenz)
Englisch
Reinforcing foundation layers on soft subgrade
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