Skip to content

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

07 April 2022

This event has now ended

You can catch-up on details or any broadcast and downloads here.


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.


For more information please contact:

Shelly-Ann Russell