Ormesby & Priory Wood School, Middlesbrough
Client: Shepherd Construction
Moorhead Group undertook the bulk excavation and ground stabilisation works at Ormesby & Priory Wood School, Middlesbrough for Shepherd Construction.
Due to the very poor engineering quality of the existing natural strata (a subgrade of silty sand with high moisture content overlying an impermeable band of glacial till, yielding in situ CBR values generally < 1%), Moorhead Group designed and undertook ground stabilisation by treating the in situ soils (15,000m3) with lime and cement to improve the materials for bulk filling and pavement construction.
Using our in-house Ground-Modelling software, Moorhead Group were then able to re-design levels to create an earthworks balance, lifting the formations to suit the new constructions and therefore accommodating the surplus subsoils.
Building areas were stabilised to provide a 15% CBR 300mm in situ layer, protected with a minimal running layer of aggregate to act as a vibro-piling platform.
External areas were stabilised to provide a 30% CBR 300mm non-frost- susceptible in situ layer to act as a capping and partial subbase replacement.
Soil stabilisation minimised surplus muck away and reduced aggregate import – benefiting both the contract programme and the environmental impact of the project.
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