ICE Technical Meeting
Wednesday 20th June 2012

Controlling ground movements during tunnelling with TBMs

Pressurised face tunnel boring machines (TBMs), such as slurry or earth pressure balance (EPB)  machines, have the capability to control ground movements to low values if operated correctly. To achieve good results it is necessary to assess, and use, the appropriate face pressure. It is also necessary to achieve effective filling of the void around the tunnel lining rings.

The presentation will outline how slurry and EPB TBMs achieve adequate ground support. The geotechnical calculations required to assess operating pressures, and how these relate to surface settlement will then be discussed. The risk of excessive local settlement, sinkholes and blow-outs will also be considered, with examples. Please join us, and take advantage of this opportunity to learn more about the construction technique which is to be used for parts of the proposed Jakarta MRT construction.

Nick Shirlaw
is a Civil Engineering graduate of the University of Bristol (UK) and has been a member of the
Institution of Civil Engineers for over 30 years. He is a Director of Golder Associates (Singapore)
Pte Ltd, and has worked on the design and construction of tunnels in Singapore, Hong Kong,
Taiwan, Toronto, Shanghai and Melbourne.

Date & Venue
Eastern Promise Pub & Restaurant, Jalan Kemang Raya No 5, Kemang, Jakarta Selatan
(Sportsbar part of the Eastern Promise)