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Lecture

Flat or Domed? The Selection of Shaft Base Slab Geometry and a Medley of Design Considerations

Event organised by The British Tunnelling Society Young Members

Date
07 April 2022
Time
19:00 - 20:30 BST (GMT+1)
Location
Institution of Civil Engineers
One Great George Street
Westminster
London, SW1P 3AA
United Kingdom

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Overview

In this lecture, Si will share some experience related to the structural design of underground concrete structures, often encountered in London area geology. The presentation will cover a seemingly insignificant but commonly seen issue in shaft design – the selection of geometry for the shaft base slab, flat and domed, each with its pros and cons.

This will expand into several related technical topics including:

  • how cracking affects the design of underground concrete structures
  • water resistance design of underground structures
  • shrinkage, creep and early-age thermal behaviour of concrete.
  • The lecture will summarise how these characteristics of concrete influence the selection of base slab geometry.

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