Abstract
Trackbed stiffness is the primary control on rail performance, the subgrade providing the majority of the stiffness for ballasted-track. Using lithological data derived from linear geological maps, examples are presented showing the variability of small strain shear modulus along selected lengths of the ‘East Coast Main Line’. Generalised, effective stress-controlled relationships relating small strain shear modulus and density to lithology are used to develop models of subgrade shear modulus from which ground stiffness may be assessed. The models show results for ground, ranging from gravel through sands to weaker clay-rich soils.
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