Abstract
A site inspection of an embankment on the West Coast Main Line (UK) revealed a general deterioration of the embankment, significant movement of the trackside services and waterlogging and bulging along the embankment toe. The medium-height embankment, with side slopes at about 30 degrees to the horizontal, was constructed on natural sidelong ground and the site had been an area of previous instability (former ash and slag tip). Site investigation, ground monitoring and analytical modelling indicated that the embankment was at limiting equilibrium and that recent progressive movement was occurring along a rotational slip surface located within the embankment core (ash and slag materials overlying reworked glacial till). The upgrade works comprised the installation of a row of stabilizing piles along the mid-height of the embankment side slope (facilitating Green Zone working); regrading to prevent shallower slips near the embankment crest and the installation of a toe drain that discharged to a nearby stream. Figure 1. Site location plan. Note: BH, borehole; TP, trial pit; (I), includes inclinometer; (P), includes piezometer. N Gill
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