ABSTRACT
The design of mono-piles requires understanding the combined response of piles under a spectrum of static to cyclic loading. Under static-loading, the response is well mimicked using subgrade modulus and limiting force. In moving soil, response of the piles is well captured using a BiP-k θ model (Guo 2022) based on two additional parameters of modulus and rotational stiffness for stable layer. Nevertheless, neither of these models has incorporated the impact of soil movement incited by preceding cyclic-loading. To impregnate the gap, a model for residual response is developed from the Guo’s model by introducing new parameters (α R and A k). The BiP-k θ is also reformulated into force-form for modelling lateral piles in stable through sliding soil. Four types of model tests are investigated, which reveal (1) the BiP-k θ model largely agrees with Guo model, and well captures response softening at large displacement or under two-way cyclic loading; and (2) the residual model is consistent with the measured evolution of displacement and rotation of piles induced by cyclic loading. This chapter provides range of model parameters, impact of eccentricity, level and number of cyclic loading, and insight into shear strain level and soil stability (via A r and α R). Examples are epitomized to facilitate use of these models in practice.
