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List of products by author: N. Bilgin
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A New Generation of Portable Linear Rock Cutting Machine (PLCM ) and Comparison with Full Scale Linear Rock Cutting...
Abstract: A new portable linear rock cutting (PLCM) device was developed in the Mining Engineering De-partment of Istanbul Technical University and supported by The Scientific and Technological Re-search Council of Turkey (TUBITAK-112M859). The basic disadvantage of the full-scale linear rock cutting test is that it requires large blocks of rock samples, which are usually difficult, too expen-sive, or...
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A stochastic method for predicting performance of EPB TBMs working in semi-closed / open mode
Abstract: A rock cutting/excavation phenomenon is in stochastic nature, which includes uncertainties in terms of decision makers. This study summarizes a new method for predicting performance (instantaneous penetration rate, daily advance rate, thrust, power, torque, and specific energy) of EPB TBMs by a stochastic method implemented into a deterministic prediction model requiring input from full-scale...
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Analysis of the Tunnel Boring Machines (TBM) Performance Parameters Using Boreability Index in Turkey
Abstract: Performance prediction and the determination of some design parameters of TBMs are becoming very crucial for tunneling industry since they are critical elements in the pre-planning of a mechanical excavation project. In this paper three case studies are analyzed with a detailed field and laboratory studies concerning in Istanbul. The performance parameters of the TBMs (Cutter forces, i.e.,...
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Cekmekoy-Sancaktepe Metro Tunnel in Istanbul
Abstract: In this study, field observations on cutter wear and breakages in between 2 stations (Carsi and Umraniye) of Uskudar-Umraniye-Cekmekoy-Sancaktepe Metro Tunnel in Istanbul are mentioned in relation to TBM operational conditions (such as instantaneous penetration rate, thrust, torque, etc.) and geological conditions (such as RQD, strength, Cerchar abrasivity), within the context of the projects...
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Cutter Forces Measurement with PLCM© Using Mini Conical Pick: Comparison with the Theoretical and Empirical Models
Abstract: A new portable linear rock cutting (PLCM©) device was developed in the Mining Engineering Department of Istanbul Technical University and supported by The Scientific and Technological Research Council of Turkey (TUBITAK-112M859). In this paper, rock cutting experiments are performed by using mini real-life conical pick with a (PLCM). The conical pick used in this study has an attack angle 45...
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Effect of Conditioning on Soil Workability determined by Mini-Slump and Flow Table Tests
Abstract: Effect of conditioning parameters on workability of sands was investigated by using flow table and newly suggested mini slump tests. The soil conditioning tests were performed on standard mortar sand at two foam types and different Foam Expansion Ratio () and Foam Injection Ratio () values. The foams were characterized by measurements of stability (half-life), density and bubble size. The...
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Effect of Soil Conditioning on Performance of an EPB TBM: from Laboratory to Mahmutbey Mecidiyekoy Metro Tunnels in...
Abstract: The basic purpose of this study supported by the Scientific and Technological Research Council of Turkey (TUBITAK, Project No: 213M487) is to analyze the effects of soil conditioning on the field performance of an EPB TBM used for excavation of the Mahmutbey-Mecidiyekoy metro tunnels having a total length of around 18.5 km (double tube) in Istanbul. Soil samples were obtained during the...
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Excavating a Metro Tunnel under a Lake with an EPB TBM Used for Istanbul 3th Airport
Abstract: The metro will make its way to the new Istanbul Airport earliest by 2021. There will be two lines, one with a length of 37 km and the other 35 km. There are few lakes left after mining activities carried out along the Metro Line which cause tremendous difficulties during tunnel excavation. This paper summarizes the performance of an EPB TBM and difficulties encountered and precautions taken...
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Excavating Metro Tunnels with an EPB TBM under Risk of Methane Explosion
Abstract: New Istanbul Airport is being constructed over an old coal field area of 35 km away from the city center. Sometimes TBM used for tunnel excavation cuts coal seams bearing methane. This paper summarizes the safety problems encountered between chainages of 24+375 km and 24+575 km. A special safety program is used during tunnel excavation. For safety reasons, methane sensors were placed upon TBM...
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Excavating Turkey’s Hardest Rock at the Bahce-Nurdag Railway Tunnel
Abstract: Southeastern Turkey’s Gaziantep province is characterized by complex fractured rock within the Eastern Anatolian Fault, and it is now the location of an important railway tunnel project. With a population of nearly 1.7 million, the province is overhauling its public transportation with a rail line between the towns of Bahçe and Nurdağı. The Bahce-Nurdag Railway Tunnel consists of two parallel...
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Factors affecting the performance of a double shield TBM in a very complex geology in Kargi Turkey
Abstract: The Kargi hydroelectric power plant consists of an earth dam approximately 500 meters long and the intake to the power plant in its northern end. An 11.8 km tunnel is being currently excavated from the intake and northwards. A double shield TBM of 9.84 m diameter is being working in the Northern Tunnel. The geology consists of Eocene aged...
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How the complex geology of Turkey affected the performance of different TBMs - lessons learnt
Abstract: The use of tunnel boring machines is increasing tremendously in Turkey. However, the complexity of geology causes important failures and inefficiency in mechanical excavation process. In this paper, the problems of frequent changes in geology in Kadikoy-Kartal metro project, and closing the openings; the change of all cutters in Beykoz tunnel in zones having different geological...
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Performance of EPB TBM in Beylerbeyi-Kucuksu Wastewater Tunnel in Istanbul
Abstract: Utilization of TBMs is unavoidable for tunnels considered in urbanized areas to realize fast and cheaper construction and excavation performance of TBMs is very crucial for economy of these projects. Terminology on excavation performance of TBMs includes generally daily and monthly advance rates, instantaneous penetration rates, cutterhead torque requirements, TBM thrust requirements, machine...
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Raise Boring Machine performance in the Yusufeli Dam and HEPP Project
Abstract: Performance of a Raise Boring Machine (RBM) used in Yusufeli HEPP project in Turkey is evaluated in this study. The depth and diameter of the energy shaft are 130 m and 2.44 m, respectively. The drill core samples were obtained from the site (diabase and granodiorite) and compressive strength, tensile strength, static elasticity modulus and Poisson’s ratio, dynamic elasticity modulus and...
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Raise Boring Operation in Kure, Kastamonu Copper Mine
Abstract: This paper concerns about the performance estimation of Raise Boring Machine which used to excavate ventilation shafts in a copper mine located at the city of Kastamonu, on Northern Turkey. Length and diameter of the ventilation shaft are 22 m and 2.6 m, respectively. Eti Copper A.S Underground Mine raise boring operation was visited to recording operational conditions and performance...
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Safety precautions against fuel leakage into NATM tunnels of Uskudar – Umraniye - Cekmekoy Metro Project
Abstract: A sudden water inrush occurred along with fuel from the old / unused underground storage tanks of a fuel-station through one of the forepooling drills and thus, construction of the double- tube NATM tunnels with 30 m bench cross-section was stopped on 12 June 2015 in Uskudar - Umraniye - Cekmekoy Metro Project. The risks and safety precautions for re-starting the construction, are summarized....
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