Use of rock microscale properties for introducing a cuttability index in rock cutting with a chisel pick
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ORIGINAL PAPER
Use of rock microscale properties for introducing a cuttability index in rock cutting with a chisel pick Kavosh Rostami 1 & Jafar Khademi Hamidi 1
&
Hamid Reza Nejati 2
Received: 26 September 2019 / Accepted: 2 September 2020 # Saudi Society for Geosciences 2020
Abstract Accurate estimation of rock cuttability is crucial for selecting and design of mechanical excavators in mining and civil engineering practices. This study is to introduce the intact rock cuttability index (IRCI) using three simple and easily accessed intact rock microscale parameters. Assuming that an intact rock consists of mineral grains (materials), cement or matrix and pores, three parameters of rock texture coefficient (TC), Cerchar abrasivity index (CAI), and porosity were selected to be included in IRCI equation. Small-scale rock cutting tests with a simple chisel pick were conducted on very low to medium strength rock specimens to calculate the specific energy (SE) as an indicator of rock cuttability. Accordingly, the correlations between rock physical and mechanical properties, IRCI, and SE were investigated. The analysis results showed that the rock strength parameters (i.e., UCS and BTS) are not well described by texture coefficient, while they were well correlated with the cuttability index developed based on rock microscale properties. The results also showed that there is a strong correlation between the intact rock cuttability index and specific energy. These findings, although promising, are preliminary. Hence, further studies are underway with additional data sets to examine the validity and extend the model to actual size cutting tools. Keywords Mechanical excavation . Rock cutting test . Specific energy . Texture coefficient
Introduction In mining and civil engineering practices, mechanical miners and excavators such as roadheaders, surface miners, continuous miners, and shearer loaders are widely employed for rock excavation and coal mining purposes. In mechanical excavation, having prior knowledge of the cuttability of rock is crucial for selecting and designing the machine and predicting its Responsible Editor: Zeynal Abiddin Erguler * Jafar Khademi Hamidi [email protected] Kavosh Rostami [email protected] Hamid Reza Nejati [email protected] 1
Mining Engineering Department, Faculty of Engineering, Tarbiat Modares University, Jalal Ale Ahmad Highway, P.O. Box 14115-111, Tehran, Iran
2
Rock Mechanics Division, Faculty of Engineering, Tarbiat Modares University, Tehran, Iran
performance. Rock cuttability is defined as the ease or difficulty of rock breakage by mechanical tools and usually expressed by specific energy (SE) as well as cutting forces. SE defined as the energy/work required to excavate a unit volume/weight of rock, has been generally used for analyzing the efficiency of rock-working process (i.e., rock penetration and fragmentation) in different scales, for example, in order to represent the concept of machinability, drillability, and cuttability (e.g., by Barker 1964
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