Record details

Title
    Numerical modelling of lumpy clay landfill
Author
    Boháč, Jan
    Mašín, David
    Najser, Jan
Language
    anglicky
Publication type
    článek v periodiku
Source title - serial
    International Journal for Numerical and Analytical Methods in Geomechanics
Vol./nr.
    Roč. 36, č. 1
Pages
    19
Year
    2012
Thesaurus term
    clay
    double porosity
    embankment
    high compressibility
    hypoplasticity
    soil structure
Keyword
    Clay
    Landfill
    Lumpy
    Modelling
    Numerical
Abstract (in english)
   Two trial motorway embankments built on a landfill consisting of clayey lumps were monitored over the period of 3 and 5 years, respectively. The subsoil of the embankment was instrumented by hydrostatic levelling profiles, pore pressure transducers and depth reference points installed in boreholes. An advanced constitutive model for clays (hypoplastic model for clays with meta-stable structure) was used for numerical modelling of both case histories. Basic hypoplastic model for clays was calibrated using isotropic compression tests and triaxial compression tests on reconstituted clay. Three additional model parameters describing the effects of lumpy structure were calibrated using oedometer tests on specimens prepared from scaled-down lumpy material (material with smaller size of clay lumps). The performance of the model was evaluated by comparison with the results of the centrifuge model of self-weight consolidated landfill. Finally, the hypoplastic model was used for simulation of bo
   th trial embankments and the results were compared with in situ measurements. The degradation of the lumpy structure of the upper layer of the in situ landfill due to weathering was back analysed using monitoring data.
Contributor
    UK Praha, Přírodovědecká fakulta
Contributor code
    UK, PřF
Source format
    R
Import date
    27. 4. 2014