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List of products by author: S. Acun
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Effects of Cutter Types on Cutter Consumption and TBM Performance in Different and Complex Geological Conditions
Abstract: EPB TBMs are widely utilized for infrastructure and transportation constructions in urban areas as mechanized tunneling is cost effective, safe and rapid when compared to other conventional methods. Today, as a result of technical improvements and increasing demand, design of TBM and cutter head, thus cutter type, cutter size and cutter layout vary in a wide range from manufacturer to...
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TBM Hyperbaric Intervention beneath a Highway in New İstanbul Airport Metro Project
Abstract: Istanbul New Airport Metro Project is a 38 km long single track metro line, which has in total 76 km of railway length and consists of 69 km TBM tunnels. In order to deal with long TBM tunnel excavations, 10 EPB type TBMs with a diameter of 6,56 meters from 4 different TBM suppliers are used. This paper investigated one of the TBMs which bored through a frequently changing and complex geology...
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The Effect of Rock Weathering on the Performance of an EPB TBM in a Complex Geology in Istanbul
Abstract: New Istanbul Airport is being constructed over an old coal field area of 35 km away from the city center in a very complex geology creating several problems during tunnel construction. This paper summarizes the effect of weathering of a sandstone with different degrees of weathering (W1-W2, W3-4 and W5) on the performance of an EPB-TBM during the construction of Metro Tunnels for Istanbul third...
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The Effects of TBM Operational Parameters on Excavation Performances in Complex Geology when Driving Twin Tunnels in...
Abstract: The geology of Istanbul is complex, changing frequently from very hard rock formation with different degrees of fracturing to soft ground in a short length. Twin tunnels which were excavated by an EPB-TBMs in Istanbul Metro Projects, gave the opportunity to investigate the effect of geotechnical properties, EPB pressures in virgin and disturbed zones by the excavation, on the performance of a...
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The factors affecting the performance of three different TBMs in a complex geology in Istanbul
Abstract: Four hundred kilometers of metro tunnels are expected to be opened in Istanbul in the near future. The geology of Istanbul is complex changing frequently from very hard rock formation to soft ground in a short length. Mahmutbey-Mecidiyekoy metro tunnels, which are currently excavated by three different EPB-TBMs, gave the unique opportunity to investigate the effect of opening ratio and physical...
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