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Temporary Slope Stabilisation - Wastewater Treatment Works Oldham, UK

Project Specification

As part of a Wastewater Treatment Works upgrade, a 25m x 50m stormwater retention tank was to be constructed. A
formation level of 14m below existing ground level required a novel approach for stabilisation of the temporary batters.
Typical solutions such as a secant pile wall or sheet pile wall were not appropriate due to the lack of flexibility to avoid
existing infrastructure.

The Designer, OGI Groundwater Specialists, proposed their Stable-Earth™ system which comprises of slope reinforcement
and erosion control using Platipus Percussion Driven Earth Anchors (PDEA®) together with groundwater management. The
design approach was flexible and enabled OGI’s Engineer to adjust the placement and frequency of the Platipus anchors
as necessary. The use of the PDEA® System and the OGI Stable-Earth™ system for this large-scale infrastructure project
has demonstrated the viability of using cost effective materials to stabilise steep batters for temporary excavation works.

Anchoring System: S2, S6 & S8
Soil Type: Temporary Works
Soil Type: As in diagram

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