New Austrian Tunneling Method - Productivity Parameters
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These would depend on a number of factors such as type of rock, stratification, slope, size and depth of tunnel, water ingress, method of excavation etc.
NATM is a design and construction monitoring methodology not a production based estimating process.
Paul E Harris
Eastwood Harris Pty Ltd, Melbourne, Australia
Planning and Scheduling Training Manual & Book Publishers & Consulting
www.eh.com.au