The topography of the site was such that to enable construction of the lower ground floor level an earth retention system was required.
Due to the absence of ground water and the adoption of the retaining system in the permanent works a contiguous wall was chosen.
Ground Conditions
The soil profile consisted of up to 5m of fill material overlying sand inter-bedded with bands of clay. As the depth of the clay bands varied the piles were designed as predominantly skin friction piles in order to avoid a reliance on the pile end bearing in to the sand.
Solution
450 and 600mm diameter continuous flight auger (CFA) piles were installed at 600 and 750mm spacings using a Soilmec CM50 and CPL CFA piling rig. This formed a retaining wall supporting 4.5 to 6m of soil.
In addition 400 and 450mm CFA bearing piles were installed to support the building and tower crane loads.
The design to accommodate the compression load, based on a factor of safety of 2.5, was verified by 4 working pile load tests. The maximum pile settlement at a working load of 800kN was shown to be less than 5mm
ADULT MENTAL HEALTH UNIT, ST. MARY'S ROAD PROJECT SHEET
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