Reinforced soil design using a two-part wedge mechanism: justification and evidence

Paul McCombie, Mike Dobie

Research output: Contribution to conferencePaperpeer-review

2 Citations (Scopus)
90 Downloads (Pure)

Abstract

Design methods for reinforced soil structures are normally divided into: external stability (defines structure dimensions) and
internal stability (determines reinforcement layout). This paper examines a method of calculation which has been developed for the internal
stability check based on a simple two-part wedge mechanism. The wedges are defined by a first plane across the width of the reinforced soil
zone, and a second plane upwards through the retained backfill. Reinforcement intersected by the first wedge contributes to the equilibrium
of forces. A large family of two-part wedges is defined, and sufficient reinforcement must be provided to ensure that all can achieve equilibrium without overloading the reinforcement. Extensive experience of using this technique indicates that the critical two-part wedge in an efficiently designed structure will normally be defined by a line crossing the reinforced soil zone at about 45 degrees, then extending through the backfill at the Coulomb angle. If seismic inertia forces are added, then the angles of both wedges will become less steep. The two-part wedge mechanism is compared with more comprehensive stability analyses, as well as observed behaviour in shaking table tests on smallscale reinforced soil walls.
Original languageEnglish
Pages1409-1414
Number of pages6
DOIs
Publication statusPublished - 13 Sep 2015
EventXVI European Conference on Soil Mechanics and Geotechnical Engineering - Edinburgh, UK United Kingdom
Duration: 13 Sep 201517 Sep 2015

Conference

ConferenceXVI European Conference on Soil Mechanics and Geotechnical Engineering
CountryUK United Kingdom
CityEdinburgh
Period13/09/1517/09/15

Fingerprint Dive into the research topics of 'Reinforced soil design using a two-part wedge mechanism: justification and evidence'. Together they form a unique fingerprint.

Cite this