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This layer is underlain by weak sandstone and very dense sand with cemented bands and lumps which extend to the end of drilling, located 40 m below the natural ground surface.The Standard Penetration Test (SPT) was performed in … exactly on the A-line of the BS5930 plasticity chart based on its liquid and plastic limits. This British Standard is set out to follow, in broad terms, the sequence of a ground investigation from initial considerations through the phased design and implementation of an investigation programme and its reporting, to the continuing investigation during and after construction. To use the plasticity chart it is necessary to plot a point whose coordinates are the liquid limit and the plasticity index of the soil to be identified. Local names are often used for soil types that occur within a particular region, e.g. is based on grain size, gradation, and plasticity.
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It is not Loam is a soft deposit consisting of a mixture of sand, silt and clay in approximately equal quantities. (1998) based on its liquid and plastic limits.
BS 5930 PDF CODE
BS 5930:2015, "the code of practice for site investigations", is a UK code of practice which came into effect on 31 July 2015 British Standards Institution. Liquidity index The liquidity index (LI) is used for scaling the natural water content of a soil sample to the limits. The A-line goes through the base line at IP = 0, WL = 20 per cent so that its equation is: IP = 0.73 (wL - 20%) °r PI = 0.73 (LL - 20%).