Consolidation of Soft Soil Layer: Numerical Investigation and Perspective for the Utilization of Hard Coal Ash Discharged from Thermal Power Plants for the Ground Improvement Action
In this paper the results of the study about ground improvement using piles of ash mixed material discharged from the thermal power plants are presented. Using Finite Element Method, the study investigates the settlement behavior and consolidation process of an improved soft soil layer using granular column. In the first part of the paper, the mechanical properties of the materials are shown. Several laboratory tests are performed to calibrate the material models using in the numerical simulations. The material model “Anisotropic Visco-Hypoplastic” for the time dependent behavior of the soft soil will be presented. The calibrate procedure of this model is explained in the second part of the paper. The results of the numerical investigation were presented and discussed.
Keywordsvisco-hypoplastic organic soil granular column consolidation ash of hard coal
Unable to display preview. Download preview PDF.
- Business Association Mineral by-products e.V. (2016): Product information, products from coal-fired power plants. www.win-ev.org, 2016-09 (In German).
- Grandas-Taveras, C. E. (2013): A study on failure modes of corner slurry trenches using anisotropic visco-hypoplasticity, Karlsruhe Institute of Technology KIT, PhD Thesis.Google Scholar
- Hughes, J.M.O., Withers, N.J. (1974): Reinforcing of soft cohesive soils with stone columns. In: Ground Engineering 7 (1974), Nr. 3, pp. 42–49.Google Scholar
- Kempfert, H.-G., Wallis, P. (1997): Geosynthetically coated sand pillars - a new foundation process in the construction of roads. In: geotechnique, special issue of the 5th informational event on “Plastics in Geotechnics”, pp. 41–46 (in German).Google Scholar
- Kirsch, F. (2004): Experimental and numerical investigations on the bearing behavior of agglomerated column assemblies. Braunschweig, Technical University Carolo-Wilhelmina zu Braunschweig, PhD Thesis, (in German).Google Scholar
- Ney, M. (2018): Uncoated sand pillars in soft soils with high organic content. Technical University of Berlin, Chair of Soil Mechanics and Geotechnical Engineering, PhD Thesis, (in German).Google Scholar
- Priebe, H. J. (1988): Estimation of the settlement behavior of soil foundation by compaction. In: Bautechnik 65 (1988), Nr. 1, pp. 23–26 (In German).Google Scholar
- Schüßler, M. (2012): Investigations of the deformation behavior of subsoil improvements with sand columns in soils with organic fractions. Technical University of Berlin, PhD Thesis (In German).Google Scholar
- Tasan, E. (2011): For dimensioning the monopile foundations of offshore wind turbines, Department of Foundation Engineering and Soil Mechanics, Technical University of Berlin, PhD Thesis (In German).Google Scholar
- TCVN12249:2018 (2018): Vietnamese Standard, Publication of Ministry of Science and Technology: Coal ash of thermal power plant using as backfill material – General requirements (In Vietnamese).Google Scholar
- Tuoi Tre News (2016). https://tuoitre.vn/, accessed on 03.10.2016.
- Zaeske, D. (2001): On the effect of unreinforced and reinforced bearing layer over pile-like foundation elements. Kassel, Kassel University, PhD Thesis (In German).Google Scholar