Numerical modelling of a test embankment on soft ground

• Autorzy: Gabryś K.
• Języki publikacji: EN

Abstrakty

EN

The construction of an embankment situated on soft subsoil with a high groundwater level leads to a rise in pore pressure. This “undrained behaviour” can made the effective stress to remain low and intermediate consolidation periods to be adopted so that the construction of the embankment is safe. During a consolidation process the dissipation of the excess pore pressure is observed in order to increase the shear strength of the soil to continue the construction process [4]. The behaviour of a test embankment founded on a soft soil in Warsaw, on the Ursynowska Scarp, in the Campus SGGW (Warsaw University of Life Sciences) site was simulated with a use of a finite element analysis [6]. This study presents an experimental work, a construction of a flood-control embankment on organic soil represented by peat. The modelling of an embankment behaviour is carried out by the program PLAXIS (Finite Element Code for Soil and Rock Analysis). Measurements were taken of pore pressure, dissipations rates and displacements in the foundation peat. Predictions of these were made using a simple Soft Soil Model. Moreover, the calculation of the safety factor, the eff ect of the drains on the consolidation process and an update mesh analysis were investigated. The results suggest the signifi cant impact of drains on the speed of the consolidation course. The commonly accepted Mohr-Coulomb Model and Soft Soil Model, which involve typical parameters obtained from in-situ and laboratory testing, can be successfully selected for examination the behaviour of fl ood-control embankment situated on soft soils. The Updated mesh and Updated water pressure analysis reduces the settlements and allows for a more realistic study of settlements, while the positive effects of large deformations is considered. However, there is a great need to compare the numerical simulation with the real existing embankments located on problematic soils.

Słowa kluczowe

EN

numerical modelling; embankment construction; soft soil

• Wydawca: Foundation for Young Scientists
• Czasopismo: Challenges of Modern Technology
• Rocznik: 2012
• Tom: Vol. 3, no. 2
• Strony: 37--43
• Opis fizyczny: Bibliogr. 14 poz., tab., rys., wykr.

Twórcy

autor

Gabryś K.

• Warsaw University of Life Sciences, Department of Geotechnical Engineering and TU-Bergakademie Freiberg, Geotechnics Institut

Bibliografia

• [1] Al Husein, M., E. Flavigny, and M. Boulon. “Long term behaviour finite element analysis of a dam with in situ measurements of the viscoplastic properties of its foundations.” Soft Soil Engineering. Th e Netherlands: Lee et al. (eds). Swets & Zeitlinger, 2001: 299–305.
• [2] Numerical methods in Geotechnical Engineering. Proceedings of the 6th European Conference on Numerical Methods in Geotechnical Engineering, Graz, Austria, 2–6 September 2010. Eds. T. Benz and S. Nordal. London: Taylor & Francis Group, 2010.
• [3] Numerical methods in Geotechnical Engineering. Proceedings of the 7th European Conference on Numerical Methods in Geotechnical Engineering, Trondheim, Norway, 2–4 June 2010. Eds. T. Benz and S. Nordal. London: Taylor & Francis Group, 2010.
• [4] Brinkgreve, R.B.J. Time-dependent behaviour of soft soils during embankment construction-a numerical study. Proc. NUMOG IX. 2004: 631–637.
• [5] Burland, J.B. “Th e yielding and dilatation of clay.” Géotechnique 15 (1965): 211–214.
• [6] Cudny, M., and H.P. Neyer. Numerical analysis of a test embankment on soft ground using an anisotropic model with destructuration. Int. Workshop on Geotechnics of Soft Soils-Th eory and Practice. Eds. Vermeer, Schweiger, Karstunen and Cudny. 2003.
• [7] Duraisamy, Y., B.B.K. Huat, and A.A. Aziz. “Engineering Properties and Compressibility Behaviour of Tropical Peat Soil.” American Journal of Applied Science 4 (10), 2007: 768–773.
• [8] Gabryś, K. “Geotechnical parameters in description of soft soil consolidation”. Challenges of modern technology 1 (2010): 61–64.
• [9] Geotechnics of soft soils: focus on ground improvement. Proceedings of the 2nd International Workshop on Geotechnics of Soft Soils, Glasgow, Scotland, 3–5 September, 2008. Eds. M. Karstunen and M. Leoni. 2008.
• [10] Nakamura, A., F. Cai and K. Ugai. “Embankment basal stability analysis using shear strength reduction finite element method.” Landslides and Engineering Slopes. From the Past to the Future. Proceedings of the 10th International Symposium on Landslides and Engineered Slopes. 30 June — 4 July 2008, China.
• [11] Plaxis 2D. Manuals, version 10.0. 2010.
• [12] Stolle, D.F.E., P.G. Bonnier and P.A. Vermeer. “A soft soil model and experiences with two integrations schemes in numerical models in geomechanics.” NUMOG 1997: 123–128.
• [13] Szeligowski, P. The prediction of soft soils settlement [in Polish]. M.Sc. Thesis. Warsaw University of Life Sciences. Department of Geotechnical Engineering. 2008.
• [14] Wolski, W., et al. Two Stage-Constructed Embankments on Organic Soils. Swedish Geotechnical Institute. Report No 32. Linkoeping, 1998.