A general view of Tannur Dam during construction in
2000Tannur Dam is a 69m high and 230m long roller
compacted concrete (RCC) gravity dam, which impounds a reservoir of
17hm3 on Wadi al Hasa, to an arid region about 200km
south of the Jordanian capital Amman. The reservoir provides water
to the Southern Ghors Project, which is to the east and south-east
of the Dead Sea and will be used for extensive irrigation in the
Great Rift Valley.
Founded on imbedded marl and limestone of only moderate
strength, the dam is in a highly seismic area, relatively close to
the Dead Sea Fault. Dam stability studies included finite element
dynamic analyses for the maximum credible earthquake of 0.5g.
Mott MacDonald carried out a review of the existing design and
tender documents with assistance from GHD of Australia and local
consultant CEC. Mott MacDonald proposed a number of changes to
ensure a competent design. These changes were adopted and the
project drawings amended.
The 60m high dam wallMott MacDonald was
also employed as the project geotechnical engineer resident on-site
for the implementation of the dam foundation treatment measures.
This involved review of the ground investigation and geological
mapping of the dam foundation, followed by the design and
implementation of dam foundation treatment measures.
A series of grout curtains were installed within the dam
foundation, utilising for the first time in Jordan the GIN (grout
intensity number) grouting methodology using both conventional open
hole techniques and through poor ground tube-a-manchette
techniques.
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