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Reshen Kalimash Motorway Project

Dr. Sauer & Partners in joint venture with iC Consulenten provided mitigation and tunnel stabilisation as well as NATM redesign following a tunnel collapse.
Estimated cost: Commencement:
November 01, 2009
Completion date:
July 01, 2010
Sami Frasheri No. 33
Technical data:
Geology description:

The geological setting is influenced by the Alpine geosyncline resulting in a complex tectonic behaviour of a variety of igneous and metamorphic rocks cut by major fault zones.

Geology types:
Bid cost: Final cost:
$1 billion USD
Service areas:
Construction methods:
Tunneling under:

A major collapse during construction of the Thierre Tunnel in 2009 led government officials to call on NATM experts to come up with an innovative fix for the 5.6km, two-lane twin tunnel, which is part of the new Reshen Kalimash Motorway. Recommended stabilisation measures by the Dr. Sauer/iC JV such as backfilling, ribs and fibre shotcrete were implemented and halted creep movements. An alternative design was developed and replaced the original horseshoe profile by an ovoid shape. Pre-treatment, excavation works and support installation were accompanied by extensive monitoring.

Stabilisation measures: Backfill and fibre shotcrete "egg"
Ovoid shape emerging from horseshoe profile