Abstract
Chalk exhibits a viscous behavior depending on time and it presents a noticeable creep under constant load. Consequently, piles founded in chalk media may have their design greatly affected. However, the different standards of the design of deep foundations don’t take into account this viscous behavior and its effect on the pile settlement in the long term. This paper deals with the case of piles under monotonic axial loads in chalk. Two methods of predicting pile settlement are developed: the transfer curves method tz, taking into account the viscosity, and the macroelement technique.
Highlights
Chalk has been the subject of several studies during these last decades because of its very particular mechanical behavior, as a soft porous rock
This paper aims to study the mechanical behavior of a pile in chalk, under axial loading
Two techniques of pile modelling under monotonic axial load are used and compared in this paper to simulate the behavior of piles in the chalk: the transfer curves method and the macroelement technique
Summary
Chalk has been the subject of several studies during these last decades because of its very particular mechanical behavior, as a soft porous rock. Several studies carried out on chalk in different laboratories, [1], [3], have shown that this material exhibits a notable creep under constant load. Current regulations such as [4] or [5] do not directly take into account viscous behavior of chalk and its effect on the relation load-settlement of the pile. Two techniques of pile modelling under monotonic axial load are used and compared in this paper to simulate the behavior of piles in the chalk: the transfer curves method and the macroelement technique. The macroelement is developed according to an elasto-viscoplastic constitutive law including isotropic hardening
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