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Article Dans Une Revue International Journal for Numerical and Analytical Methods in Geomechanics Année : 2022

Undrained cylindrical cavity expansion/contraction in stiff clays using a two‐surface plasticity model

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Wei Cheng
  • Fonction : Auteur
  • PersonId : 1125337
Ren-Peng Chen
  • Fonction : Auteur
  • PersonId : 1125338
Jean-Michel Pereira
Yu-Jun Cui
  • Fonction : Auteur

Résumé

This paper presents a semi-analytical solution of undrained cylindrical cavity expansion/contraction problem using a two-surface plasticity model for natural stiff clays from the view point of poromechanics. The present solution reduces the classical boundary problem into a group of seven first-order ordinary differential equations via an auxiliary independent variable ξ under undrained conditions. It strictly follows the premise of constant soil mass. Meanwhile, the solution for the constant soil volume problem is used for comparison. It shows that constant soil mass assumption is of paramount importance in developing solutions under high stress condition, while constant soil volume induces non-negligible errors in effective stress and pore pressure distributions. Based on the premise of constant soil mass, extensive parametric studies on cavity expansion/contraction are undertaken to investigate the effects of the model key parameters on the stress components distribution, excess pore pressure distribution and cavity expansion curves. The present solution could be useful while dealing with geotechnical and petroleum engineering problems involving stiff clays or soft claystones. The application in Praclay Gallery excavation in natural Boom clay well demonstrates the validity of the present solution.
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Dates et versions

hal-03558777 , version 1 (04-02-2022)

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Wei Cheng, Ren-Peng Chen, Jean-Michel Pereira, Yu-Jun Cui. Undrained cylindrical cavity expansion/contraction in stiff clays using a two‐surface plasticity model. International Journal for Numerical and Analytical Methods in Geomechanics, 2022, 46 (3), pp.570-593. ⟨10.1002/nag.3312⟩. ⟨hal-03558777⟩
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