Examining the relation between rock mass cuttability index and rock drilling properties

Yetkin, Mustafa Emre; Özfırat, M. Kemal; Yenice, Hayati; Şimşir, Ferhan; Kahraman, Bayram

doi:10.1016/j.jafrearsci.2016.09.025

Cited by 20 publications

(8 citation statements)

References 14 publications

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“…Modern mechanical excavation strongly depends on the efficiency of the means involved to optimise investment costs, and so rock features must be considered [1]. Prior to excavation, the type and performance of excavation machinery (i.e., hydraulic breakers, roadheaders, shear-loaders, TBMs, drilling rigs, and cutting bits) must be determined.…”

Section: Introductionmentioning

confidence: 99%

Thermal Effects on the Drilling Performance of a Limestone: Relationships with Physical and Mechanical Properties

et al. 2021

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This work evaluates the effect of high temperatures and cooling methods on the drillability of Prada limestone. Samples from boreholes drilled during the design stage of the Tres Ponts Tunnel in the Catalan south Pyrenean zone (Spain) were subjected to temperatures of 105, 200, 300, 400, and 600 °C, and then cooled at a slow rate or by quenching. Sievers’ J-value (SJ) and brittleness (S20) were determined on thermally treated samples, and the drilling rate index (DRI) was calculated for each temperature. The results show that thermal treatment implied a sustained increase in the drillability of the rock of up to 40% at 600 °C and a change in the drillability category (from medium to high). At 600 °C, SJ and S20 tripled and doubled, respectively, the initial values obtained for the intact rock. The results were inconclusive about the influence of the cooling method on the drilling performance of Prada limestone for the tested range of temperatures. The substantial improvement observed in the drillability of Prada limestone when heated, measured in terms of DRI, could help in the development of novel thermally-assisted mechanical excavation methods. Additionally, strong correlations between drillability variables (i.e., SJ and S20) and physical and mechanical variables of Prada limestone (i.e., P- and S-wave velocities, uniaxial compression strength, elastic modulus, and Poisson’s ratio) are proposed. Correlations will help make preliminary predictions of drillability based on properties such as uniaxial compression strength and ultrasound wave velocities.

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Section: Introductionmentioning

confidence: 99%

Thermal Effects on the Drilling Performance of a Limestone: Relationships with Physical and Mechanical Properties

et al. 2021

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“…Consequently, the crushing area has a smaller range and the unit loads on the rock are larger, which is important for compact-rock mining. Some researchers claim [11,21] that the "pointed" end of a conical pick allows greater concentration of the transferred energy and easier initial gap penetration, and also facilitates intensive lateral rock crushing, thus supporting mining [22]. These improved cutting conditions can be attributed to the sufficiently wide "fissure", in which the pick encounters little resistance during its rotary cutting movement.…”

Section: Mechanical Mining Using Cutting Toolsmentioning

confidence: 99%

“…This phenomenon is inextricably linked to rock disintegration, but it is also dynamic in nature, its patterns and intensity varying as a function of time. Wear occurs when the pick loses some of its volume (through abrasion or micro-cutting) due to mechanical fatigue (resulting, for instance, from dynamic loads) or thermal fatigue [22][23][24]. In other words, it is a change in the pick's geometry and its contact area with the rock.…”

Section: Mechanical Mining Using Cutting Toolsmentioning

confidence: 99%

Methods of Mechanical Mining of Compact-Rock—A Comparison of Efficiency and Energy Consumption

Kotwica

Małkowski

2019

Energies

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This paper compares the methods of mechanical mining of rock in terms of their efficiency, energy consumption, and the durability of the tools they involve. It presents the advantages of mechanical heading-driving methods. In the first part, we described the methods used to assess rock workability, and the influence of rock types and parameters on mining efficiency. Furthermore, we discussed the compact-rock mining process in terms of the energy it consumes. We provided the description of the most common mechanical methods, such as milling, static crumpling and undercutting, including the tools involved, and the requirements and limitations for the use of these methods. The paper presents unique machinery solutions designed to reduce the energy consumed by mining processes. In the final part of the paper, we propose a solution to select the mechanical method of rock mining as a function of rock type and parameters.

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“…Thuro and Plinninger have examined the connection between some geological parameters, cutting performances and bit wears by means of German case studies in different geological settings [19]. Physical and mechanical properties of surrounding rocks and ore zones are examined by investigations found out on samples taken from an underground ore mine by Yetkin and his colleagues [20]. As it can be seen in Figure 3, specific energies were found out by using the linear cutting setup system in mine mechanization laboratory of mining engineering department at Middle East Technical University.…”

Section: Relationship Between Cone Indenter Hardness and Specific Energymentioning

confidence: 99%

Effect of Cone Indenter Hardness on Specific Energy of Rock Cutting

Doğruöz¹,

Bölükbaşı²

2017

SDÜ Fen Bil Enst Der

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Abstract:The effects of rock mechanics parameters on performance of various tunneling and excavation machines used in tunneling application has been an important issue in conventional, NATM, and TBM tunneling. Mechanical feature of machine performance is important for cutting specific energy and cutting parameters. Specific Energy (SE) of rock excavation depends on rock features such as uniaxial compressive strength (UCS), Brazilian tensile strength (BTS) and standard cone indenter hardness (Is), as well as bit shape and size, cutterhead design, and cut geometry. In this study, impact of cone indenter hardness on SE has been examined and results of statistical analysis on laboratory data related to linear scale cutting of various rock types with different pick cutters are discussed. The results shows that there is a strong relationship between cone indenter hardness and laboratory specific energy. The cone indenter hardness results are between 0.30 MPa and 3.63 MPa. The tests were applied on weak and moderate rocks types. Based on the test results, two different prediction models were created using second order functional regression analyses. Kaya Kesmede Koni Delici Sertliğinin Spesifik Enerjiye Olan EtkisiAnahtar Kelimeler Mekanik kaya kazısı, Özgül enerji, Koni delici sertliği Özet: Tünelcilik uygulamalarında kullanılan çeşitli kazı makinalarının kaya mekaniksel özelliklerine olan etkileri geleneksel, NATM ve TBM tünelciliği yöntemleri için büyük önem arz etmektedir. Makine performansının mekanik özellikleri, kesme özgül enerjisi ve kesme parametreleri açısından önem arz etmektedir. Kayaç kazısının özgül enerjisi, kesici ucların tasarımlarına, ebatlarına, ve kesme geometrilerine bağlı olduğu kadar tek eksenli basma dayanımı, Brazilian çekme dayanımı ve standart koni delici sertliği gibi kayaç özelliklerine de bağlı olabilmektedir. Bu çalışmada, koni delici sertliğinin özgül enerji üzerine etkisi ve çeşitli kayaç örnekleri için değişik ebatlarda kesici uçlarla yapılan kesme işlemlerinin istatistik modeller kurularak doğrusal kesmede etkileri incelenmiştir. Elde edilen sonuçlara göre, laboratuvar özgül enerjisi ile koni delici sertliği arasında güçlü bir ilişki olduğu gözlemlenmektedir. Yapılan testler sonucunda koni delici sertlikleri 0.30 MPa ile 3.63 MPa arasında değişmektedir. Bu çalışmada zayıf ve orta sertlikte kayaçlar üzerinde deneyler yapılmıştır. Elde edilen sonuçlar kullanılarak ikinci dereceden üssel fonksiyon metodu ile regresyon yöntemi uygulanarak iki farklı tahmin modeli oluşturulmuştur.

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Examining the relation between rock mass cuttability index and rock drilling properties

Cited by 20 publications

References 14 publications

Thermal Effects on the Drilling Performance of a Limestone: Relationships with Physical and Mechanical Properties

Thermal Effects on the Drilling Performance of a Limestone: Relationships with Physical and Mechanical Properties

Methods of Mechanical Mining of Compact-Rock—A Comparison of Efficiency and Energy Consumption

Effect of Cone Indenter Hardness on Specific Energy of Rock Cutting

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