Search Results - "Hamidi, Jafar Khademi"

Performance prediction of hard rock TBM using Rock Mass Rating (RMR) system by Khademi Hamidi, Jafar, Shahriar, Kourosh, Rezai, Bahram, Rostami, Jamal

“…RMR is a simple rock mass classification system and is often used for characterization and design purposes in preliminary stages of mining and civil…”
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A Closer Look into Chip Shape/Size and Efficiency of Rock Cutting with a Simple Chisel Pick: A Laboratory Scale Investigation by Mohammadi, Mehdi, Khademi Hamidi, Jafar, Rostami, Jamal, Goshtasbi, Kamran

“…Chip geometry can play a crucial role in understanding the rock cutting efficiency in mechanical excavation. In this study, the shape and size distribution of…”
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Simultaneous Effects of Joint Spacing and Orientation on TBM Cutting Efficiency in Jointed Rock Masses by Bejari, Hadi, Khademi Hamidi, Jafar

“…Rock mass parameters including weak surfaces are the most important parameters which should be taken into account for an accurate analysis of the rock…”
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An integrated GIS-based approach for geohazards risk assessment in coal mines by Vaziri, Vahid, Khademi Hamidi, Jafar, Sayadi, Ahmad Reza

“…From the viewpoint of safety in underground coal mining, the most suitable mining panel is the one with minimum geological structures, the right machinery, and…”
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Application of Fuzzy Set Theory to Rock Engineering Classification Systems: An Illustration of the Rock Mass Excavability Index by Khademi Hamidi, Jafar, Shahriar, Kourosh, Rezai, Bahram, Bejari, Hadi

“…The characterization of rock masses is one of the integral aspects of rock engineering. Over the years, many classification systems have been developed for…”
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Numerical Modeling of a Punch Penetration Test Using the Discrete Element Method by Basirat, Rouhollah, Hamidi, Jafar Khademi

“…Understanding the brittleness of rock has a crucial importance in rock engineering applications such as the mechanical excavation of rock. In this study,…”
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A case study on TBM tunnelling in fault zones and lessons learned from ground improvement by Bayati, Massoud, Khademi Hamidi, Jafar

“…TBM tunnelling in fault zones is one of the major challenges which affects the advance rate of TBM and sometimes leads to long TBM stoppage. The Zagros water…”
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An investigation of the relationship between muck geometry, TBM performance, and operational parameters: A case study in Golab II water transfer tunnel by Heydari, Sasan, Khademi Hamidi, Jafar, Monjezi, Masoud, Eftekhari, Abbas

“…An attempt was made to examine the relationship between various TBM operational factors, its performance, and muck geometry during the excavation of a short…”
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Optimization of flyrock and rock fragmentation in the Tajareh limestone mine using metaheuristics method of firefly algorithm by Asl, Parvin Faraji, Monjezi, Masoud, Hamidi, Jafar Khademi, Armaghani, Danial Jahed

“…A successful and favorable explosion not only causes a proper rock fragmentation, but also decreases the unfavorable and unwanted environmental issues caused…”
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Evaluation of fine material and chip formation in rock cutting with a conical tool by Kadkhodaei, Mohammad Hossein, Ghasemi, Ebrahim, Hamidi, Jafar Khademi, Rostami, Jamal

“…The production of fines and chips during rock cutting plays an essential role in the efficiency of rock cutting, which in turn impacts productivity and…”
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New Cerchar Device Used for Evaluating Cerchar Abrasivity Parameters by Karrari, Seyed Sajjad, Heidari, Mojtaba, Hamidi, Jafar Khademi, Teshnizi, Ebrahim Sharifi

“…Rock abrasivity is an important parameter that influences tool design and wear, the efficiency of tools, and cost during rock excavation. Generally, the…”
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Evaluation of rock cutting performance of conical cutting tool based on commonly measured rock properties by Kadkhodaei, Mohammad Hossein, Ghasemi, Ebrahim, Khademi Hamidi, Jafar, Rostami, Jamal

“…Efficiency of rock cutting process plays a critical role in performance of mechanical excavation units. The composition of cutting forces (normal and drag…”
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Introducing a new rock abrasivity index using a scaled down disc cutter by Moradi, Maziar, Khosravi, Mohammad Hossein, Hamidi, Jafar Khademi

“…Rock abrasivity influences wear of cutting tools and consequently, performance of mechanized tunneling machines. Several methods have been proposed to evaluate…”
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Use of rock microscale properties for introducing a cuttability index in rock cutting with a chisel pick by Rostami, Kavosh, Hamidi, Jafar Khademi, Nejati, Hamid Reza

“…Accurate estimation of rock cuttability is crucial for selecting and design of mechanical excavators in mining and civil engineering practices. This study is…”
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Effects of Blade Speed on Microstructure and Wear Behavior in the Abrasion Value Cutter Steel (AVS) Test by Rastgoo, Abdollah, Jafari, Vahid, Hamidi, Jafar Khademi, Sabour Rouh Aghdam, Alireza

“…Cutter wear is a critical concern in TBM tunneling, directly influencing cutter consumption and tunnel advance rate-crucial aspects for project planning and…”
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A discrepancy between observed and predicted NATM tunnel behaviors and updating: a case study of the Sabzkuh tunnel by Taromi, Majid, Eftekhari, Abbas, Hamidi, Jafar Khademi, Aalianvari, Ali

“…The 11 km long Sabzkuh water conveyance tunnel is under construction using conventional and tunnel boring machine tunneling techniques in the Zagros Mountains…”
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Geotechnical risk assessment based approach for rock TBM selection in difficult ground conditions by Shahriar, Kourosh, Sharifzadeh, Mostafa, Hamidi, Jafar Khademi

“…There are many potential sources of geotechnical risk in mechanized rock tunnelling. Problems such as encountering fault zones with running and water bearing…”
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Estimation of drilling rate index values of granitic rocks with their mineralogical properties using different estimation models by Karrari, Seyed Sajjad, Heidari, Mojtaba, Hamidi, Jafar Khademi, Teshnizi, Ebrahim Sharifi

“…The drilling rate index (DRI) is a measure, commonly used in predicting drillability in tunneling and drilling in quarry projects; this requires a particular…”
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Presenting an equation for estimating sandstone abrasivity using physical and mechanical properties by Esfandiari, Morteza, Hosseini, Mehdi, Khademi Hamidi, Jafar, Taleb Beydokhti, Alireza

“…The selection of an appropriate excavation procedure in terms of cost and time during the preliminary stages of an underground project is influenced by…”
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Comments on the article “Tunnel Boring Machine (TBM) selection using fuzzy multicriteria decision making methods” by Yazdani-Chamzini, A., Haji Yakhchali, S. [Tunneling and Underground Space Technology 30 (2012) 194–204] by Khademi Hamidi, Jafar

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