Abstract
AbstractThe aim of this paper is to present a methodology for identifying the soil parameters controlling the delayed behaviour from laboratory and in situ pressuremeter tests by using an elasto‐viscoplastic model (EVP‐MCC) based on Perzyna's overstress theory and on the elasto‐plastic Modified Cam Clay model. The influence of both the model parameters and the soil permeability was studied under the loading condition of pressuremeter tests by coupling the proposed model equations with Biot's consolidation theory. On the basis of the parametric study, a methodology for identifying model parameters and soil permeability by inverse analysis from three levels of constant strain rate pressuremeter tests was then proposed and applied on tests performed on natural Saint‐Herblain clay. The methodology was validated by comparing the optimized values of soil parameters and the values of the same parameters obtained from laboratory test results, and also by using the identified parameters to simulate other tests on the same samples. The analysis of the drainage condition and the strain rate effect during a pressuremeter test demonstrated the coupled influence of consolidation and viscous effects on the test results. The numerical results also showed that the inverse analysis procedure could successfully determine the parameters controlling the time‐dependent soil behaviour. Copyright © 2008 John Wiley & Sons, Ltd.
Highlights
The identification of soil parameters from in situ tests, such as pressuremeter tests consisting in studying the expansion of a cylindrical cavity within the soil, has been commonly used since the invention of the pressuremeter apparatus by Menard [1]
The aim of this paper is to present a methodology for identifying the soil parameters controlling the delayed behaviour from laboratory and in situ pressuremeter tests by using an elasto-viscoplastic model (EVP-MCC) based on Perzyna’s overstress theory and on the elasto-plastic Modified Cam Clay model
Zentar et al [2] divided the methods used for this purpose into three categories: (a) those based on empirical or semi-empirical relationships between soil properties and pressuremeter parameters; (b) those based on the theoretical development of cylindrical cavity expansion solutions; and (c) those based on numerical simulations of the test
Summary
The identification of soil parameters from in situ tests, such as pressuremeter tests consisting in studying the expansion of a cylindrical cavity within the soil, has been commonly used since the invention of the pressuremeter apparatus by Menard [1]. In the past few decades, several studies for identifying soil parameters from pressuremeter tests have been found in the literature, i.e. Anderson et al [4], Bahar et al [5], Pye [6], Hicher and Michali [7], Zentar et al [2], Rangeard et al [8], etc. Few of these are concerned by the delayed behaviour of fine soils. In order to study this kind of problem, we based our analysis on experimental results obtained with the equipment called pressio-triax [2, 8], which could simulate a self-boring pressuremeter (SBP) with pore water pressure measurement at the cavity wall in tightly controlled laboratory conditions
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