Effect of Anisotropy and Destructuration on Behavior of Haarajoki Test Embankment

Abstract

The Strathprints institutional repository (https://strathprints.strath.ac.uk) is a digital archive of University of Strathclyde research outputs. It has been developed to disseminate open access research outputs, expose data about those outputs, and enable the management and persistent access to Strathclyde's intellectual output. Abstract: This paper investigates the influence of anisotropy and destructuration on the behavior of Haarajoki test embankment, which was built by the Finnish National Road Administration as a noise barrier in 1997 on a soft clay deposit. Half of the embankment is constructed on an area improved with prefabricated vertical drains, while the other half is constructed on the natural deposit without any ground improvement. The construction and consolidation of the embankment is analyzed with the finite-element method using three different constitutive models to represent the soft clay. Two recently proposed constitutive models, namely S-CLAY1 which accounts for initial and plastic strain induced anisotropy, and its extension, called S-CLAY1S which accounts, additionally, for interparticle bonding and degradation of bonds, were used in the analysis. For comparison, the problem is also analyzed with the isotropic modified cam clay model. The results of the numerical analyses are compared with the field measurements. The simulations reveal the influence that anisotropy and destructuration have on the behavior of an embankment on soft clay.

Comparison of Anisotropic Rate-Dependent Models for Modeling Consolidation of Soft Clays

“…As there is natural variation between clay samples, which is further magnified by potential sample disturbance, for each clay layer a number of tests of the same type were used to estimate the average values of parameters. A number of publications report the required parameter values (e.g., Karstunen et al 2005;Yildiz et al 2009;Karstunen and Yin 2010). However, the procedure for calibrating model parameters is presented briefly as follows:…”

An anisotropic elastoplastic model for soft clays based on logarithmic contractancy

“…The S‐CLAY1 model was further extended to include soil structure (S‐CLAY1S ) through an intrinsic yield surface. The S‐CLAY1S model has proven its ability to reproduce the behaviour of normally or slightly overconsolidated structured soft clays . Despite its good performance, especially for settlement prediction, horizontal displacements are generally not well matched, for example, .…”

Permissible range of model parameters for natural fine-grained materials

“…In this case, the difference is not so big and the consequences will be negligible. The value proposed by Yildiz et al [26] equal to 8 is quite low compared to the proposed lower bound 12.9. However, Yildiz et al [26] seems to have taken a dummy value of 8 for a regardless of the other properties of the soil layer due to the lack of appropriate data for calibration of the a parameter.…”