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Technical paper: Sludge tank foundation piles formed in infilled graving docks

PR Hunter. This paper was first published in GE’s May 1986 edition.

Because of the proposed closure of the Manchester Ship Canal, sludge which is presently shipped out to sea will, in future, be piped from Manchester to a terminal in Liverpool for disposal.

Part of the North West Water authority design for the Mersey Valley Sludge Pipeline Terminal involves the construction of four holding tanks 24m in diameter and 19m high at Sandon Dock, Liverpool. The loading from each tank varies with sludge volume, the maximum being 1 3 850tonnes vertically and 280tonnes laterally.

Since tank settlements, both total and differential, are critical and since the tank site is on an area of infilled graving docks, it was essential that piled foundations be adopted. Fig. 2 indicates the location of the tanks and the sites for them, together with borehole sites and graving dock sub-surface structures. 

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