SSI from Numerical Analyses to Macro-element Models

Introduction

Soil–structure interaction (SSI) consists of the interaction between soil (ground) and a structure built upon it, in which the foundation structures with their surrounding soils (in certain range which soil is disturbed) can be regarded as an entire system, so-called a macro-element, with global forces (or moments)-displacements (or rotations) responses. Currently, we focused on the design of caisson foundation by means of discrete element method, finite element method and mesh-free method for progressive failure analysis and failure envelope investigation, which have been later applied to establish “forces-displacements” models in structural level so-called macro-element models.


Topic 1: Modelling of caisson foundation with DEM

We investigated micro mechanism of failure and deformation of caisson foundation by means of DEM, considering effects of particle crushing and particle shape.



  • Wang P#, Yin Z-Y* (2020). Micro-mechanical analysis of caisson foundation in sand using DEM. Ocean Eng., 203: 107240.
  • Wang P#, Yin Z-Y* (2020). Micro-mechanical analysis of caisson foundation in sand using DEM: particle breakage effect. Ocean Eng., 215: 107921.


Topic 2: Modelling of caisson foundation with FEM

We investigated the failure development of caisson foundation with FEM (Lagrange coupled with SPH in ABAQUS) in which the critical state-based model was implemented. A formulation of failure envelope in the H-M-V space was proposed for different properties of soils and size of caisson.



  • Jin Z#, Yin Z-Y*, Kotronis P, Li Z, (2019). Advanced numerical modelling of caisson foundations in sand to investigate the failure envelope in the H-M-V space. Ocean Eng., 190: 106394.
  • Jin Z#, Yin Z-Y*, Kotronis P, Jin Y-F (2019). Numerical investigation on evolving failure of caisson foundation in sand using the combined Lagrangian-SPH method, Mar. Georesour. Geotec., 37(1): 23-35.


Topic 3: Modelling of caisson foundation with macroelement

We developed hypoplasticity-based macroelement models for caisson foundation in sand and in clay respectively for mechanical behaviours under both monotonic and cyclic loadings.



  • Jin Z#, Yin Z-Y*, Kotronis P, Li Z*, Tamagnini C(2019). A hypoplastic macroelement model for a caisson foundation in sand under monotonic and cyclic loadings. Marine Structures, 66: 16-26.


Topic 4: Modelling of caisson foundation with deep learning

We developed data-driven surrogate models using deep learning to capture the responses of caisson foundation in sand, such as failure envelopes, force-displacement relationships.



  • Zhang P#, Yin Z-Y*, Zheng Y, Gao FP (2020). A LSTM Surrogate Modelling Approach for Caisson Foundations. Ocean Eng., 204: 107263.
  • Zhang P#, Jin YF#, Yin Z-Y, Yang Y (2020). Random forest based artificial intelligent model for predicting failure envelopes of caisson foundations in sand. Appl. Ocean Res., 101: 102223.