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Thanks Fochts for your reply, the geotechnical report recommended excavating the alluvial clay to a depth of at least 2m and re-filling with an engineering material (Type 1 or similar). As the proposed foundations for the new platform are only 0.5m away from the rail sleeper ends, I'm very...

I wonder if any other members can offer advice? I am seeking an economic method of increasing the shear strength of alluvial clay before constructing a platform. Due to the location of the site (Adjacent to a railway), I would rather not go down the temporary works path and infill new...

Generally, the greater the particle size, the higher the angle of repose. For instance dry Sand particles of 0.5mm in diameter may have an angle of repose of approx 30 degrees, small gravels (12mm diameter) will have an angle of repose of about 40 degrees with larger gravels (25mm diameter)...