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Back-Analysis of the Vung Tau Full-Scale Trial Using FEA Simulation of Geogrid Stabilisation and the Geocell Mattress

2019; Springer Nature; Linguagem: Inglês

10.1007/978-981-15-2184-3_146

2366-2557

Andrew Lees, Michael Dobie, Mahesa Bhawanin,

Geotechnical and construction materials studies

The conventional approach to characterising the mechanical effect of multi-axial geogrid on soil involves testing the mechanical properties of the soil and geogrid separately and introducing them to a calculation model. Often the true performance is found to be greater than the sum of the parts – which can be explained by mechanical stabilisation where the properties of the soil interacting with a geogrid are actually enhanced. This paper presents a new shear strength criterion derived from large triaxial compression tests performed on soil with stabilising multi-axial geogrid. A composite approach to modelling the geocell mattress is also taken adopting an equivalent cohesion or tensile strength with enhanced stiffness for the soil contained within the cells of the mattress, derived from 3D FEA simulation of a theoretical large triaxial geocell mattress specimen. The full-scale loading test on a heavy-duty working platform including multi-axial geogrid and a geocell mattress on soft soil at Vung Tau, Vietnam was reported at the Geotec Hanoi 2011 conference. These material modelling techniques for mechanically stabilised soil and the geocell mattress were applied using finite element analysis to provide an accurate back-analysis of this important trial.