Onshore & Offshore Geotechnics Drilling Vessel SRV Bavenit drilling anchor-free in DP mode in the SRV Bavenit drilling anchor-free Drilling Vessel strait Skate IV Jack-up Platform working in the Bosporus strait in front of the of Old Town

aat ve Yatırım A.Ş. - Eurasia İnşaat ve Yatırım

(Avrasya Tüneli İşletme Tüneli Ş (Avrasya retained the services of Fugro to perform geo- the services of Fugro Ş retained

‘Deep water’ Geotechnical Site Investigation: Scope of Work: Scope of Work: The scope of the ‘deep water’ geotechnical site investigation was use for conditions geotechnical and geological the determine to section that is to be in the design of the underwater road Boring Machine (TBM). The site investigation drilled using a Tunnel information for engineering was designed to provide program and determine assessment for the deep underwater tunnel section and for seismic design properties adequate dynamic soil/rock included downhole analysis. The site investigation program at 9 locations, (CPTs) sampling and Cone Penetration Tests (FMCB) and Barrel Marine Core coring with the Fugro rock in-situ testing by Downhole Wireline P/S Logging. Due to the strong SRV equipped vessel Bavenit Fugro’s site project the at currents with a state-of-the-art Dynamic Positioning system was mobilized depths water for investigation site water’ ‘deep the perform to than 22 m. greater The tunnel is the critical link of the 14.6 km route awarded awarded km route The tunnel is the critical link of the 14.6 mechansim to the (BOT) a Build Operate Transfer through ATA ATA technicalto tunnel route proposed the along investigation for the tunnel. characteristics the soil and rock estimate The Eurasia Tunnel Project is a 5.4-km twin-deck bored motorway tunnel that will cross the Bosphorus at its will cross motorway tunnel that 5.4-km twin-deck bored is a Project The Eurasia Tunnel Selimiye on the Asian side of Istanbul. side to Sultanahmet on the European southern running from end Co.) Inc. Investment and Construction Operation, Tunnel crosses Eurasia Tunnel in 2010. The proposed Joint Venture and the light rail the strait south of two existing bridges under construction. It is designed to ease tunnel currently an alternative link providing road pressure traffic İstanbul’s of , km south 1 at about Bosphorus traverse the to being constructed. which is currently Eurasia Tunnel Project Tunnel Eurasia Eurasia Tunnel Project

Shallow Water Geotechnical Site Investigation: modify the drilling and sampling program in the field to optimize the The scope of the shallow water geotechnical site investigation exploration program. Standard testing was performed onboard the was to collect subsurface soil and rock samples and characterize SRV Bavenit for the deepwater site investigations and on a field stratigraphic variations as well as the strength, and stiffness of those laboratory close to the site for the shallow water site investigations. soils and rocks. The site investigation program included downhole The standard tests included moisture content determinations of all sampling and Cone Penetration Tests (CPTs) at 6 locations, rock samples, wet densities of all intact extruded samples, point load coring with the Fugro Marine Core Barrel (FMCB), in-situ testing by tests on rock samples, shear strength estimates of all suitable fine- Downhole Wireline P/S Logging and measurements of hydraulic grained samples using torvanes and pocket penetrometers; and conductivity through dissipation tests. Operations were conducted Unconsolidated-Undrained Triaxial Compression tests (UUTXC) on from Fugro’s Skate IV jack-up platform. fine-grained Gradation tests to assist in classification of the soils and to determine their grain. Additional standard tests such as grain Standard and Advanced Laboratory Testing: size distribution, hydrometer tests, fines content determinations, Conducting geotechnical testing immediately upon sample retrieval atterberg limits, corrosion potential, carbonate content; and specific is a routine component of Fugro’s marine drilling operations. The gravity of solids were performed at off site laboratories. Advanced “real-time” character of onboard testing allows quality control of laboratory tests including permeability testing, Direct shear testing, the sample logging, comparison of laboratory test data with in Isotropically Consolidated Drained Triaxial Compression Tests and situ data measured with the cone penetration tests, preparation Cyclic Simple shear Tests on potentially liquefiable sands were also of field boring logs with actual data rather than just sample performed at off site laboratories. lithologies, comparison of the engineering properties of sediments with those of adjacent borings in real time, and field engineers to

Borehole location plan: nearshore Boreholes (Skate IV, red) and offshore Boreholes (SRV Bavenit, green) along the tunnel alignment at the southern end of the Bosporus

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