Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Full-scale field study of using geofoam to reduce earth pressures on buried concrete culverts
Abstract Applications of geofoam for buried culverts/pipes keep increasing; however, the design of such applications is still challenging due to lack of full-scale studies. Considering practice needs, a full-scale field study was carried out to investigate the effectiveness of different geofoams with different layouts to reduce overburden stresses on deeply buried, large-size culverts. Among the eight test sections, five were installed with two different of geofoams (7.5 and 15 kg/m3) in thicknesses of 300 and 600 mm and the remaining three were built with loose sand, lightly and normally compacted clay, respectively. The acquired data indicated that the geofoam can greatly reduce the overburden stress over the culvert. In general, higher compressibility of geofoam resulted in greater stress transfer but did not cause excessive settlement at the surface due to significant burial depth. However, due to its large span and dome shape, a secondary soil arching formed when the soil over shoulder settled more than that over the crown, which readjusted the stress and resulted in further reduction in the stress at the culvert shoulder but partially compromised the stress reduction at the crown. Such phenomenon shall be appropriately addressed to avoid unexpected damage to buried culverts or pipes.
Highlights A full-scale study on geofoam applications on deeply buried culverts was conducted over a nearly 4-year period. Eight test sections were built as part of a real-world project, which used different geofoams with different configurations. The investigated culverts have a net span of 5 m and overall span of approximately 10 m with a burial depth up to 27 m. The sections were instrumented and then were monitored during and 30 months after construction. Sections using loose sand and lightly compacted clay were compared with sections using geofoam.
Full-scale field study of using geofoam to reduce earth pressures on buried concrete culverts
Abstract Applications of geofoam for buried culverts/pipes keep increasing; however, the design of such applications is still challenging due to lack of full-scale studies. Considering practice needs, a full-scale field study was carried out to investigate the effectiveness of different geofoams with different layouts to reduce overburden stresses on deeply buried, large-size culverts. Among the eight test sections, five were installed with two different of geofoams (7.5 and 15 kg/m3) in thicknesses of 300 and 600 mm and the remaining three were built with loose sand, lightly and normally compacted clay, respectively. The acquired data indicated that the geofoam can greatly reduce the overburden stress over the culvert. In general, higher compressibility of geofoam resulted in greater stress transfer but did not cause excessive settlement at the surface due to significant burial depth. However, due to its large span and dome shape, a secondary soil arching formed when the soil over shoulder settled more than that over the crown, which readjusted the stress and resulted in further reduction in the stress at the culvert shoulder but partially compromised the stress reduction at the crown. Such phenomenon shall be appropriately addressed to avoid unexpected damage to buried culverts or pipes.
Highlights A full-scale study on geofoam applications on deeply buried culverts was conducted over a nearly 4-year period. Eight test sections were built as part of a real-world project, which used different geofoams with different configurations. The investigated culverts have a net span of 5 m and overall span of approximately 10 m with a burial depth up to 27 m. The sections were instrumented and then were monitored during and 30 months after construction. Sections using loose sand and lightly compacted clay were compared with sections using geofoam.
Full-scale field study of using geofoam to reduce earth pressures on buried concrete culverts
Wang, Junqi (Autor:in) / Huang, Jie (Autor:in)
Geotextiles and Geomembranes ; 49 ; 1355-1367
15.05.2021
13 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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