Impact of Petrography and Hardness of Sandstone Minerals on the Wear of Mini Disk Cutters through Rolling Indentation Ab
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ORIGINAL PAPER
Impact of Petrography and Hardness of Sandstone Minerals on the Wear of Mini Disk Cutters through Rolling Indentation Abrasion Test (RIAT) A. Cheshomi1 · M. Moradizadeh1 · S. Fizollahi1 Received: 23 March 2020 / Accepted: 13 August 2020 © Springer-Verlag GmbH Austria, part of Springer Nature 2020
Abstract Abrasivity is one of the most important properties in drilling and tunneling projects. This phenomenon, which increases costs and significantly reduces drilling efficiency, is quantified using various techniques. The Cerchar test (CAI) and the Rolling Indentation Abrasion Test (RIAT) are, respectively, one of the oldest and newest methods in this regard. In this new test, the weight loss (RIATa) and depth of penetration of the mini disc cutters into the sample (RIATi) are measured. In the present research, 18 sandstone samples were prepared and their petrography analysis were carried out as quartz percentage (Q%) and equivalent quartz content (EQC). Moreover, Cerchar abrasion index (CAI) for each sample was determined by the Cerchar test. Finally, the RIAT test was performed on the samples to determine their abrasion penetration rate (APR = RIATa/ RIATi) and penetration time rate (PTR = RIATi/Time) as two new abrasion criteria. The results showed that there is an inverse significant relationship between APR and PTR. In addition, there was a significant and direct relationship between APR and Q%, APR and EQC, and APR and CAI. The quadratic and exponential models were identified as the most valid models. Overall, the relationship between PTR and Q%, PTR and EQC, and PTR and CAI is inverse, and exponential and inverse models are the most valid models. The results showed that Q%, EQC, and CAI can be considered for evaluating the disc cutters wear in the laboratory model. A comparison of the results of the present and previous study showed that the variations of APR–EQC, APR–CAI, PTR–EQC, and PTR–CAI were similar. The minor difference between the present and previous results is due to the mineralogical differences. Keywords RIAT test · Abrasion penetration rate · Penetration time rate · Petrography · CAI
1 Introduction It is the interaction between a given material and the tools that cause their wear. Cutting tool wear is an important issue in various industries including mining engineering, petroleum exploration and exploitation, civil engineering, groundwater management (Piria et al. 2020), and tunnel boring. Being rocks and soils composed of different minerals with varying degrees of hardness, their impact on the wear of tool is different. Indirect, direct, and holistic approaches have been proposed for abrasion measurement * A. Cheshomi [email protected] 1
Department of Structural and Engineering Geology, Faculty of Sciences, School of Geology, University of Tehran, Tehran, Iran
and evaluation (Golovanevskiy and Bearman 2008). Indirect methods estimate the abrasion based on some basic rock properties such as uniaxial compressive strength (UCS) and equivalent quartz content (EQC), as well a
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