Papers Published

  1. Gera, F. and Hueckel, T. and Peano, A., Critical issues in modelling the long-term hydro-thermo-mechanical performance of natural clay barriers, Engineering Geology, vol. 41 no. 1-4 (1996), pp. 17 - 33 [0013-7952(95)00047-X] .
    (last updated on 2007/04/09)

    Abstract:
    An adequate understanding of the behavior and the capability to model the evolution of the clay barriers are not easy tasks. The factors that need to be understood and modeled include stress evolution, long-term strain or creep, thermal effects on solid skeleton, on interstitial fluids and on mineralogy. The difficulty of the task is increased by the facts that many effects are coupled, that their rates must be extremely low, in order to be realistic, and that the time period to be modeled defies the possibility of direct experimental observation. Several critical issues are identified and discussed briefly such as: constitutive law to describe the thermo-mechanical behavior of the clay skeleton, modeling of the fluid phase in clays and its response to heating, thermal fracturing and healing. Strategies are suggested for a rational approach to the experimental investigation of some relevant processes.

    Keywords:
    Performance;Thermodynamics;Mechanical properties;Mathematical models;Geological repositories;Radioactive wastes;Reliability;Calibration;Thermal effects;Stresses;Strain;