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More information on selected engineering geology case studies:

Eurasia Tunnel Project

The tunnel is the critical link of the 14.6 km route awarded through a Build Operate Transfer (BOT) mechansim to the ATAŞ (Avrasya Tüneli İşletme İnşaat ve Yatırım A.Ş. - EurasiaTunnel Operation, Construction and Investment Inc. Co.)Joint Venture in 2010. The proposed Eurasia Tunnel crosses the strait south of two existing bridges and the light rail tunnel currently under construction. It is designed to ease İstanbul’s traffic pressure providing an alternative road link to traverse the Bosphorus at about 1 km south of Marmaray, which is currently being constructed.

ATAŞ retained the services of Fugro to perform geotechnical investigation along the proposed tunnel route to estimate the soil and rock characteristics for the tunnel.

The scope of the ‘deep water’ geotechnical site investigation was to determine the geological and geotechnical conditions for usein the design of the underwater road tunnel section that is to bedrilled using a Tunnel Boring Machine (TBM). The site investigationprogram was designed to provide information for engineeringassessment for the deep underwater tunnel section and determineadequate dynamic soil/rock properties for seismic design and analysis. The site investigation program included downholesampling and Cone Penetration Tests (CPTs) at 9 locations, rock coring with the Fugro Marine Core Barrel (FMCB) and in-situ testing by Downhole Wireline P/S Logging. Due to the strongcurrents at the project site Fugro’s SRV Bavenit vessel equippedwith a state-of-the-art Dynamic Positioning system was mobilizedto perform the ‘deep water’ site investigation for water depthsgreater than 22 m.