Application of Rock Abrasiveness and Rock Abrasivity Test Methods—A Review

Sustainability, Journal Year: 2023, Volume and Issue: 15(14), P. 11243 - 11243

Published: July 19, 2023

The processes of rock formation have long been known and widely described in many literature items worldwide. Due to the multitude occurring types, they are distinguished by various properties. For decades, scientists worldwide determining parameters which these properties rocks can be described. Tests commonly performed research centres Depending on scientific discipline, some researchers focus geological (colour, structure, texture, chemical composition). Other physical mechanical properties: hardness, density, strength properties, compactness, etc. Among them, abrasiveness abrasivity also distinguished. In terms nomenclature, very similar often confused. Even within academic community, use names interchangeably, needs corrected. This article aims explain difference between abrasivity, classify methods for their assessment present practical applications mining construction industry. It should emphasized here that is determined when we interested abrasive wear natural stone tool with cut stone. purpose this let reader decide whether carry out an or test method use.

Language: Английский

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Assessment method for determining rock brittleness based on statistical damage constitutive relations

Geomechanics for Energy and the Environment, Journal Year: 2023, Volume and Issue: 37, P. 100517 - 100517

Published: Nov. 23, 2023

Language: Английский

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New Cerchar Device Used for Evaluating Cerchar Abrasivity Parameters

International Journal of Geomechanics, Journal Year: 2024, Volume and Issue: 24(3)

Published: Jan. 11, 2024

Rock abrasivity is an important parameter that influences tool design and wear, the efficiency of tools, cost during rock excavation. Generally, abrasiveness rocks measured with Cerchar index (CAI). In this research, several parameters such as penetration stylus (Ps), volume material scratched in groove (Vm), scratching force (SF), energy (SE), specific (CSSE) were determined using device. For evaluating parameters, 24 samples used comprising igneous, metamorphic, sedimentary rocks. The new classification was presented based on parameters. Sievers J miniature drill test (SJ) calculated for comparison test. Then, relationship between SJ investigated, relationships accurately acceptable presented. results indicated abrasion ratio (CAR) a good measuring cutting. exhibited relation (R2 = 0.78) CAR. addition, CAR showed correlation 0.97) cutting (SEcut). can be to evaluate laboratory tools

Language: Английский

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Investigation of Disc Cutter Wear in Tunnel-Boring Machines (TBMs): Integration of Photogrammetry, Measurement with a Caliper, Weighing, and Macroscopic Visual Inspection

Applied Sciences, Journal Year: 2024, Volume and Issue: 14(6), P. 2443 - 2443

Published: March 14, 2024

During the construction of tunnels using tunnel-boring machines (TBMs), wear disc cutters is an unavoidable process. The timely replacement worn can have a positive effect on time and therefore costs. be assessed various measurement methods. aim this article to show different methods measuring evaluating present their main advantages disadvantages. In study, four wear-measuring were used applied double cutter: macroscopic visual inspection, profile with caliper, weighing, close-range photogrammetry. results measurements showed that cutter was subject normal abrasive wear, local steel chipping occurring. Based photogrammetry measurements, also created compared original profile. It found best for assessment achieved by several simultaneously. integration evaluation recommended comprehensive understanding wear.

Language: Английский

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Investigation of the Influence of Cutter Geometry on the Cutting Forces in Soft–Hard Composite Ground by Tunnel Boring Machine Cutters

Processes, Journal Year: 2024, Volume and Issue: 12(10), P. 2243 - 2243

Published: Oct. 14, 2024

Tunnel Boring Machines (TBMs) are integral to modern underground engineering construction, offering enhanced safety and efficiency. However, TBMs often face challenges in complex geological conditions, such as composite strata, resulting reduced advancement speed increased cutter wear. This study investigates the rock-breaking characteristics of TBM disc cutters strata through numerical simulations using Particle Flow Code (PFC) 5.0 software. Focusing on Jinan Metro Line 6, research analyzes forces, rock crack propagation, impact edge shapes The discrete element method (DEM) is employed simulate microscopic behaviors rocks, providing insights into formation, expansion, failure. study’s findings reveal that design operational parameters can significantly influence lifespan By modifying spacing penetration depth, enhancing efficiency, grouting softer layers, maintain effective excavation strata. establishes a comprehensive understanding interplay between actionable strategies enhance performance mitigate damage.

Language: Английский

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ANALYSIS OF THE METHODS OF DETERMINING THE BRITTLENESS INDEX AND THEIR APPLICATION FOR TERRIGENOUS RESERVOIR ROCKS OF THE DNIPRO-DONETSK BASIN

Visnyk of Taras Shevchenko National University of Kyiv Geology, Journal Year: 2024, Volume and Issue: 1 (104), P. 22 - 29

Published: Jan. 1, 2024

The article discusses the concept of rock brittleness index, which is widely used for design hydraulic fracturing. Three main approaches to its calculation (mineralogical, using elastic properties, log data) are characterized. For each approaches, characteristics most methods, were created rocks with different mineralogical composition, physical properties or based on empirical dependencies, given. two sets core material samples terrigenous Dnipro-Donetsk Basin, index fragility according petrogenic components was determined by methods and – Young's modulus Poisson's ratio, angle internal friction. A comparative characteristic results obtained carried out, showed similarity trends in lithology petrophysical rocks. authors recommend Jarvie method, characterized high accuracy ease use, use evaluating reservoirs Basin.

Language: Английский

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Investigation of Micro-Scale Damage and Weakening Mechanisms in Rocks Induced by Microwave Radiation and Their Associated Strength Reduction Patterns: Employing Meta-Heuristic Optimization Algorithms and Extreme Gradient Boosting Models

Mathematics, Journal Year: 2024, Volume and Issue: 12(18), P. 2954 - 2954

Published: Sept. 23, 2024

Microwave-assisted mechanical rock breaking represents an innovative technology in the realm of mining excavation. The intricate and variable characteristics geological formations necessitate a comprehensive understanding interplay between microwave-induced damage subsequent deterioration strength. This study conducted microwave irradiation assessments on 78 distinct samples, encompassing granite, sandstone, marble. A total ten critical parameters were identified: Microwave Irradiation Time (MIT), Power (MIP), Longitudinal Wave Velocity prior to Treatment (LWVB), post-Microwave (LWVA), Percentage Decrease (LWVP), Porosity before (PB), after (PA), Increase (PP), Uniaxial Compressive Strength following (UCSA). Utilizing Pied Kingfisher Optimizer (PKO) alongside Extreme Gradient Boosting (XGBoost), we developed PKO-XGBoost machine learning model elucidate relationship UCSA nine additional parameters. was benchmarked against other prevalent frameworks, with Shapley additive explanatory methods employed assess each parameter’s influence UCSA. findings reveal that provides superior accuracy delineating relationships among physical properties, variables, microscopic attributes rocks, Notably, PA emerged as having most significant effect UCSA, indicating is primary contributor reductions Additionally, MR exhibited substantial influence; under identical conditions, rocks lower density demonstrated greater susceptibility strength degradation. Furthermore, during microwave-assisted operations, it imperative establish optimal MIT MIP values effectively diminish while facilitating cutting processes. insights derived from this research offer more rapid, cost-efficient approach for accurately assessing correlations resultant damage—providing essential data support enhancing rock-breaking efficiency.

Language: Английский

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The photogrammetric approach in conical picks wear rate evaluation

Production Engineering Archives, Journal Year: 2023, Volume and Issue: 29(4), P. 413 - 420

Published: Oct. 27, 2023

Abstract The cutting tools in mining industry are especially prone to rapid wear, since most of the rocks exhibit aggressive abrasion attributes. A typical representative fast wearing end-tools is a conical pick (also known as tangential-rotary cutter). In order decrease premature deterioration, manufacturers and users tend enhance lifespan tool by wide range approaches, namely heat treatment, chemical burnishing, hardfacing etc. estimate wear rate given one has select appropriate procedure method evaluation. By this time, commonly applied basing on mass loss measurements being exploited with constant parameters fixed conditions. Authors proposed also new volumetric assessment, three-dimensional photogrammetric scanning compared results outcome traditional evaluation same sets tools. Additionally, paper contains recommendations regarding both approaches (volumetric mass), focusing possibilities concerning manufactured tool.

Language: Английский

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