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List of products by author: D. Tumac
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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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Cutter Forces Measurement with (PLCM ) Comparison with the Theoretical Models
Abstract: Proper machine and cutter selection, cutter head design and performance prediction for mechanized excavators such as TBM or roadheaders are the most important parameters for a mechanized tunnelling or mining project. The most used machine design parameters are cutter layouts, cutting power of the machine, torque and thrust. Besides, performance prediction of the machines can be done by...
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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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Effect of Soil Conditioning on the EPB-TBM Excavation Performance: A Case Study of Dudullu-Bostanci Metro Project,...
Abstract: The use of underground space for transportation, energy requirement, sanitation and wastewater management is continuously increasing in urban areas. Mechanical excavation of this underground space with Earth Balance Pressure Tunnel Boring Machine (EPBTBM) is one of the most preferred method beneath intensive urban areas. A good soil conditioning can reduce the surface settlement and create a...
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Performance of Raise Boring Machine (RBM) in Low to Moderately Hard Hornfels Rocks: A case Study of Efemcukuru Gold...
Abstract: Raise Boring Machine (RBM) provides a safe means of excavating a circular hole between two levels without the use of explosives. These machines were developed for the underground mining industry but nowadays is increasingly used on infrastructural projects. This paper aimed to assessment of the performance of a RBM during drilling / excavation of a ventilation shaft in the Efemcukuru Gold Mine,...
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Predicting Roadheader Performance by using Portable Linear Cutting Machine
Abstract: Roadheaders are widely used in mining and tunneling industry. A portable linear cutting machine (PLCM) has been developed within a project supported by Scientific and Technological Research Council of Turkey (TUBITAK 112M859) for the performance prediction of mechanical excavators used in mining and tunneling applications. A field study was performed in Amasya Suluova Coal Mine owned by PLT...
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Prediction of Reaming Performance of Inclined Raises Using Pilot Hole Drilling
Abstract: Appropriate performance prediction of Raise Boring Machines (RBMs) in feasibility and planning stage of mechanized shaft excavation projects directly effects the economics of the projects and job completion time. This study aims to develop empirical performance prediction models for inclined reaming operations by using pilot hole drilling and reaming operational parameters and...
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Single Shield TBM Performance Analysis in Mixed ground Conditions: A Case Study in the Dudullu Bostanci Metro Tunnel,...
Abstract: The performance analysis of single shield TBMs in mixed ground conditions in the Dudullu-Bostanci tunnel is presented in this study. Dudullu-Bostanci Metro Project is a mega underground construction project being constructed in Asian part of Istanbul, which runs approximately north to south under the densely-populated Anatolian side of the city. Four earth pressure machines (EPB-TBMs) having...
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TBM performance prediction using PLCM and comparison with TBM field performance parameters
Abstract: Full Scale Linear Cutting Machine (FLCM) is a most popular rock cutting test device for prediction performance parameters of mechanical excavators. LCM test have some disadvantages that requires too much manpower, large blocks of rock samples, which are usually difficult, too expensive, or impossible to obtain. For these reasons a new portable linear rock cutting...
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Unrelieved Spesific Energy Estimation from PLCM and FLCM Linear Rock Cutting Tests and Comparison with Rock Properties
Abstract: Estimation of laboratory specific energy values from mechanical rock properties to predict the efficiency of mechanical miners (tunnel boring machines, roadheaders, continuous miners, shearers, etc.) is the basic aim of this study using laboratory linear rock cutting devices. Specific energy is defined as the amount of energy required to break a unit volume or weight of rock expressed in kWh/m3...
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