Publication Abstract

DFI - PFSF Piling & Ground Improvement Conference 2022 Proceedings, (DFI and PFSF)

Working Platforms for Tracked Plant - A New Design Method Including Multiaxial Geogrids
Michael J. D. Dobie, Andrew S. Lees, John Buckley and Erkan Tahiroglu

The installation of geogrid can improve the bearing capacity of working platforms significantly, allowing thinner granular layers to be installed and bringing cost savings associated with the smaller volumes of material and excavation. Existing bearing capacity calculation methods often incorporate the geogrid benefit in terms of a tensile strength obtained from testing in air but this implies large deformations to mobilise a tension membrane effect and is not suited to multi-axial stabilising geogrid. By testing the shear strength of stabilised granular materials as one composite material and applying finite element analysis (FEA) to examine in detail the mechanical behaviour of working platforms, mechanisms were identified which were confirmed by physical testing. It was found that a simple linear relationship between bearing capacity and geometry could be used in routine design calculations for granular layers with and without geogrid on clay subgrades.

 article #3840; publication #1076 (IC-2021)