Reinforced soil shear key to mitigate extrusion failure in soft soils under working platforms

Ian Scotland, Viktor Poberezhniy, Alireza Tatari

Research output: Chapter in Book/Report/Conference proceedingConference contribution

183 Downloads (Pure)

Abstract

Geogrids and geotextiles are widely used in working platforms to increase the allowable surface bearing pressures and reduce the platform thickness required. While analytically based approaches exist for the design of these platforms, these vary in their complexity and the range of critical properties they consider, leading to uncertainty in which ones to suggest. They can be over conservative compared to empirical methods based on historical performance. For projects with combinations of high rig loading and very soft underlying ground (cu < 20 kN/m2), there is greater potential for extrusion and edge circular failures. The edge stability of platforms can be improved with a number of measures such as increased stand-off zones, loading mats, balancing mounds and shear trenches. This paper considers the extrusion mechanism and how a wrapped shear trench can be used to counteract edge insta-bility and extend the suitability of platforms over very soft soils. The effectiveness of this method is demonstrated with a UK case study. This paper covers a brief introduction to working platform design, before comparing a range of approaches. The paper discusses the extrusion failure mechanism and a solution using a wrapped shear key trench.
Original languageEnglish
Title of host publicationProceedings of the XVII ECSMGE-2019
EditorsHaraldur Sigursteinsson, Sigurour Erlingsson, Bjarni Bessason
PublisherInternational Society for Soil Mechanics and Geotechnical Engineering
Number of pages8
ISBN (Electronic)9789935943613
ISBN (Print)9789935943613
DOIs
Publication statusPublished - 1 Sep 2019
EventThe XVII European Conference on Soil Mechanics and Geotechnical Engineering Reykjavik Iceland - Reykjavik , Iceland
Duration: 1 Sep 20196 Sep 2019
https://www.ecsmge-2019.com/

Conference

ConferenceThe XVII European Conference on Soil Mechanics and Geotechnical Engineering Reykjavik Iceland
Abbreviated titleXVII ECSMGE-2019
Country/TerritoryIceland
CityReykjavik
Period1/09/196/09/19
Internet address

Keywords

  • Extrusion, Shear Trench
  • Geosynthetics
  • Reinforcement
  • Working Platforms

Fingerprint

Dive into the research topics of 'Reinforced soil shear key to mitigate extrusion failure in soft soils under working platforms'. Together they form a unique fingerprint.

Cite this