Elephant and Castle Town Centre Development - Engineering within the Harwich Formation-PPT Presentation

PPT Presentation

Pdf Summary

The presentation describes the Elephant and Castle Town Centre development in London, focusing on engineering in the Harwich Formation near existing tunnels.<br /><br />The basement uses CFA bearing piles and secant piles. The Integrated Ticket Hall (ITH) uses deep rotary-bored bearing piles, contiguous piles and secant piles installed with polymer. Excavation levels vary across the site, with the ITH reaching approximately –11.25 mOD and –14.25 mOD. Ground investigations recorded water levels around –1 mOD and –4 mOD, and placed the base of the London Clay near –19.4 mOD.<br /><br />Temporary excavation stability was assessed using 3D analysis, with consideration of Eurocode 7 uplift checks, ground movement assessment and pressure relief. The presentation raises the question of whether clay around a tunnel constructed roughly 100 years ago may have been disturbed. It also notes that the Harwich Formation encountered during excavation to basement level B5 was generally a permeable fine sand.<br /><br />The development was reported to be close to completion. The presenter’s opinions are their own; the presentation disclaims guarantees of accuracy and endorsement by DFI.

Keywords

Elephant and Castle

town centre development

London

Harwich Formation

basement excavation

CFA piles

secant piles

rotary-bored piles

Eurocode 7

tunnel engineering