Interpretation of recompression of peats after unloading based on strain rate- and temperature- effect

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4. Interpretation of recompression of peats after unloading based on strain rate- and temperature- effect

Peat is common in cold regions and Southeast Asian regions. Being deposited in the subsurface, it exhibits large deformation against loads from superstructure in a relatively short-term. The long-term settlement continues in peat even after the service of infrastructure, resulting in its gradual deformation. Economical options to mitigate such a long-term behaviour are preloading method, including application of surcharge and vacuum, where the ground is brought into an overconsolidated state by unloading. The precise prediction of recompression behaviour of soft soils, however, remains challenging due to the complex coupling of short-term swelling and long-term compression, as well as simultaneous effect of temperature; considering the changes in albedo due to urbanisation and the growing use of energy piles, it is a factor that cannot be overlooked. Accordingly, the combined effect of strain rate and temperature is addressed in this paper. The temperature controlled oedometer tests indicate; [1] the recompression of peats, including the post-unloading isothermal long-term creep and thermal compression, does not follow the (compressive) rate-dependency observed under monotonic loading conditions, i.e., classic isotach, and [2] the isotaches are distorted after unloading. The unloading-history invoked distorted rate-dependency is, in this paper, referred to as local isotach as a comprehensive framework to describe the combined effect of strain rate, temperature and unloading. 

International Conference on Advances and Innovations in Soft Soil Engineering (ICAISSE2026)

Multiphysics Behaviour