Soil Consolidation Marmaray – City - Republic of

Project owner City of Istanbul

Product Colbonddrain CX 1000

Function Soil Consolidation

Contractor ALTERNATİF ZEMİN MEKANİĞİ

Project date 2014

Volume 500 000 lm

Marmaray suburban rail is an essential project for Solution Istanbul, connecting with under the • Installing Colbonddrain CX 1000 vertical drain in a 1.2 m Boshphorus and running in the heart of the city. It is raster with an average depth of 15 m to speed up soil crucial to connect the city’s metro network over two consolidation continents; in the future it will also connect the After soil measurements and investigation had been suburbs of Istanbul with the heart of the city. performed, the calculated 1.2 m installation raster and average 15 m installation depth delivered the calculated Challenge 0.9 m settlement in a 6 months time frame instead of It is a real civil engineering challenge to shore up and years. stabilize weaker soils in a short time frame to allow early construction on them. Using Prefabricated Vertical Drains Benefits of the solution (PVD’s) is a cost efficient solution to reach this goal and to Applying PVD’s as a solution not just allowed the stabilize soft soils even in 30-40 m depths. contractor to dramatically reduce construction time, but Applying PVD’s a path is formed for excess pore-water also delivered significant cost savings compared to other created by the overburden. Water is drained off to the possible civil engineering solutions for stabilizing soft soils surface resulting in a stable subgrade on which in such depths, like piling or even replacing the complete construction can take place. soil.

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Colbonddrain CX1000 - at work

Installation machine installing Time benefit with Prefabricated Vertical Drain Forms path for excess pore-water created by the Colbonddrain CX1000 overburden

Colbonddrain with its patented core and unique production Result method of thermally bonding the filter at the entire surface Expensive and time consuming traditional methods with makes a thoroughly tough and durable geocomposite with intensive truck and machinery demand could be replaced excellent drainage capacities. by installing Colbonddrain CX1000. A stable sub-grade Colbonddrain’s high tensile strength allows faster has been created for the railway superstructure in a short construction and the thermally bonded filter provides a time, which will serve the millions of travellers in the tear off free and thus safer installation. upcoming decades.

Installation benefits Colbonddrain is easy to handle with a roll length of 280 m and is suitable for use in all soil types. Its unique production method and its high tensile strength allows usage with all installation rig types.

Products used

Colbonddrain CX1000 Prefabricated Vertical Drain (PVD) geocomposite for soil consolidation

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