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Keywords: HEADINGS
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Journal Articles
Proceedings of the Institution of Civil Engineers - Civil Engineering (1994) 102 (5): 34–38.
Published: 01 May 1994
... temporary structurewhich allowed all tunnels tobe driven from a single intermediate heading. Its principal functions were to silts of the Quaternary period to about -23 mad, then through the White andGrey Chalks to its base a-t46 mad. The water-table was at +2 masl. +8. From level +18.30 m (i.e. 18.30 masl...

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