FEIT Research Project Database

Scale effects in geotechnical physical modelling in sand

Project Leader: Shiaohuey Chow
Primary Contact: Shiaohuey Chow (shiaohuey.chow@unimelb.edu.au)
Keywords: civil engineering; geotechnical engineering; knowledge discovery; physical modelling
Disciplines: Infrastructure Engineering

Laboratory small-scale model testing is a cost-effective geotechnical physical modelling technique as full-scale testing may not be always feasible (eg: offshore soil-structure interaction). However, small scale model testing typically involves low stress level, which is known to generate scale effects particularly for modelling in sand causing unrealistically high sand dilation.

This project aims to systematically investigate the scale effects in geotechnical physical modelling in sand, and propose a reliable scaling approach to enable identical sand constitutive response between small scale and full scale condition.

The project will first examine stress-dilatancy relationship at low stress level using element tests, which will form the basis of the stress-scaling approach. The scale effects is then systematically examined for several offshore applications with different failure mechanism (eg, compressive loading of surface footing and tensile pull-out of deeply buried plate anchor) through a series of laboratory small scale model tests at low stress level and centrifuge tests at elevated stress level.

The project involves travel opportunity where the centrifuge testing will be conducted at the National Geotechnical Centrifuge Facilities, the University of Western Australia, Perth. The project will advance current understanding of fundamental sand behaviour under low stress level and increase confidence in small scale testing in sand benefiting the geotechnical physical modelling community.

PhD supervisors: Dr Shiaohuey Chow, Prof Mark Cassidy