Effects Of Initial Stress State On Performance Of Embankments On Soft Soils

Publisher:
Australian Geomechanics Society
Publication Type:
Journal Article
Citation:
Australian Geomechanics Journal, 2012, 47 (3), pp. 77 - 88
Issue Date:
2012-01
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Analysing the behaviour of soft soil under embankment loads is a challenging task for geotechnical engineers. This numerical study revisits the case study of an embankment constructed on Boston Blue Clay, considering the model incorporating the influence of soil creep on the ground lateral defonnation and pore water pressure. Then a numerical parametric study is conducted to investigate the influence of the lateral earth pressure coefficient at rest (Ko) calculated on the different available correlations on the vertical and horizontal displacements, pore water pressures, and the of safety of the embankment. The results indicate that although the value of Ko influences the predicted horizental and vertical displacements notably, it has minor effects on the predicted pore water pressures. The lateral earth pressure coefficient influences the long term stability of the embankment and thus the effects of the initial stress field on the stability of embankments should be taken into consideration, while assessing the perfonnance of embankments constructed on soft soils. It is recommended to determine the in situ horizontal stresses using accurate methods such as self-boring pressuremeter to predict the behaviour of embankments on the soft ground precisely.
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