By Springman, S.
Read Online or Download Constitutive and Centrifuge Modelling: Two Extremes: Proceedings of the Workshop on Constitutive and Centrifuge Modelling, Monte Verità, Switzerland, 8-13 July 2001 PDF
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Extra resources for Constitutive and Centrifuge Modelling: Two Extremes: Proceedings of the Workshop on Constitutive and Centrifuge Modelling, Monte Verità, Switzerland, 8-13 July 2001
Figure 11b shows the stress response envelope for a state of stress on the ‘wet’ side of the yield locus, with η < M: an orderly response is obtained. Figure 11a shows the envelope for a state of stress on the ‘dry’ side of the yield locus with η > M. Now, no matter the direction of the strain increment, no matter whether the response is elastic or elastic-plastic, the stress increment retreats inside the current yield locus: we either have elastic unloading or plastic softening. The advantage of using the stiffness formulation is now clear.
1991) An important experimental confirmation of this approach came from a temporary safety measure against overturning of the tower. The Committee soon recognised the need for temporary and fully reversible interventions for the improvement of the safety against overturning by foundation failure, and for gaining the time to complete the investigations and analyses necessary to conceive and implement the final stabilisation measures. The observation that the northern side of the tower foundation had been steadily rising for most of the 20th century led to the suggestion of applying a north counterweight as a temporary measure.
Excavation of elements 1 and 2 give a proportion of less than one quarter. Having demonstrated that localised soil extraction gives rise to a positive response, the next stage was to model a complete underexcavation intervention aimed at safely reducing the inclination of the tower by a significant amount. A preliminary study was carried out of extraction using a shallow inclined drill hole, extracting soil from just beneath the foundation. Although the response of the tower in terms of decrease of inclination was favourable, the stress changes beneath the foundation were large, consequently a deeper inclined extraction hole was investigated.