Eurasia Tunnel, Bolton

17 November, 2016 | 18:30 - 20:30

Construction of the Eurasia tunnel.
Construction of the Eurasia tunnel.

About this event

The Eurasia Tunnel is being constructed between the Asian and European sides of Istanbul along a 14.6km route including a total 5.4km twin-deck tunnel that will cross the Bosphorus beneath the seabed, with an aim to relieve Istanbul’s transcontinental traffic pressure.

At its deepest point, the TBM will be 106m below sea level and endure a face-pressure of 11bars, which is the highest in the world among the mixshield TBMs. The excavation diameter is 13.7m. This talk will focus on a specific aspect of the project, the Asian Transition Box, a 40m deep excavation which marks the transition from TBM to NATM tunnelling methods and is the point where the TBM was launched from.

The design of the excavation posed some significant challenges, and the geotechnical parameters of the Trakya Formation had to be recharacterised once excavation had begun.

Speaker: Dr Alexis Rose

Refreshments served from 6pm for a meeting start of 6.30pm.

Organised by ICE NW Geotechnical Group.


For more information, please contact:

Paul McMahon

Event materials

The following materials are available for download:


Dr Alexis Rose

Dr Alexis Rose has over ten years' experience working as an Engineering Geologist and Geotechnical Engineer, including four years as a PhD Research Assistant. She has a wide range of skills gained from working within the consulting, contracting and academic sectors and currently leads of the geotechnics team in the WSP | Parsons Brinckerhoff Bristol office.

With a background in geology and engineering geology, Alexis has designed and supervised a range of site investigations and has experience in the design of retaining walls, piled foundations and slopes in a range of ground conditions and has detailed knowledge of using software such as SLOPE/W, WALLAP and PLAXIS 2D.

Alexis also has experience in the supervision of geotechnical site works, in particular piling and earthworks, ensuring that works are constructed according to the specification. The PhD research undertaken by Alexis was linked to a construction project in the City of London, where an innovative pile group foundation solution was being constructed for the first time. The research involved extensive experimental modelling using a geotechnical centrifuge, followed by 3D finite element modelling using ABAQUS software.

For the Istanbul Straits Road Tube Crossing Project in Istanbul, Alexis worked as a Geotechnical Engineer in the site office for 3 months. The main task was the re-design of the 40m deep launch pit for the TBM. The support system was a two-phase bored pile retaining wall (contiguous and secant), complete with ground anchors up to 40m long. Analysis was completed using PLAXIS, for a number of side wall sections, as well as the TBM face wall and NATM face wall.