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RE: Wind Turbine Foundations

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Any chance you could get the geotechnical engineer to give you criteria for
rock anchors to use as hold downs?  We have used them successfully to keep
foundations in place when there was really no way to resolve the overturning
moment.  Williams Rod or Dwydag rods are a good choice.  You might have to
drill in 20'-40' to get the required resistance.


Nick Blackburn

-----Original Message-----
From: Steven Mallett [mailto:smallett(--nospam--at)]
Sent: Wednesday, December 06, 2000 4:48 AM
To: seaint(--nospam--at)
Subject: Wind Turbine Foundations

I am looking for information on design guidelines for foundations for wind
turbines, i.e. big overturning moment. This proposed wind turbine has a
200 foot high steel tubular post, 150 foot diameter rotor. Approximate
forces are vertical load of 150 kips, horizontal load of 120 kips, and
overturning moment of 15,000 ft.kips.

Foundation material will be sandstone (about 5 ksf allowable bearing)
with 8 feet overburden. I would appreciate some reference to where I
could find foundation design information for something of this magnitude
and dynamic load implications.

Steven A. Mallett, P.Eng.

Dillon Consulting Ltd.
137 Chain Lake Drive
Halifax, NS  B3S 1B3
Ph.  902-450-4000, Ext.234
Fax. 902-450-2008