Long-term in-situ measurements of concrete culverts with high fills

• Autores: J. Vaslestad, G.Y. Yesuf, T.H. Johansen
• Localización: Bearing capacity of roads, railways and airfields: proceedings of the 8th International Conference on the Bearing Capacity of Roads, Railways and Airfields, Champaign, Illinois, USA, June 29-July 2, 2009 / Erol Tutulumluer (dir.), Imad L. Al-Qadi (dir.), Vol. 1, 2009, ISBN 9780415804325, págs. 697-706
• Idioma: inglés
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• Resumen

  • Four instrumented full-scale tests using geofoam (expanded polystyrene) for load reduction on buried rigid culverts are described. The culverts were built and instrumented in the period 1988 to 1990. The method involves installing a compressible inclusion (geofoam) above rigid culverts in order to reduce the vertical earth pressure. Three full scaletests have been performed on buried concrete pipes under rock fill embankment and one full scale test on a concrete box culvert beneath silt clay fill. The instrumentation consisted of hydraulic earth pressure cells, deformation and temperature measurements. The reduction of vertical earth pressure has been compared with the overburden pressure which is calculated from the depth and unit weight of the fill. The geofoam effectively reduces the vertical earth pressure, and long-term observations shows that the earth pressure is reduced to less than 30% of the overburden in the granular fill. The earth pressure is reduced to less than 50% of the overburden in the silty clay. The long term observations of earth pressure and deformation for more than 15 years show that the method using geofoam is stable over time.