Variation of Drilling Rate Index (DRI) with temperature and its relationship with thermal damage on 'Prada' limestone

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Title: Variation of Drilling Rate Index (DRI) with temperature and its relationship with thermal damage on 'Prada' limestone
Authors: Martínez-Ibáñez, Víctor | Basco, Aniello | Garrido, M. Elvira | Hidalgo Signes, Carlos | Tomás, Roberto | Miranda, Tiago
Research Group/s: Ingeniería del Terreno y sus Estructuras (InTerEs)
Center, Department or Service: Universidad de Alicante. Departamento de Ingeniería Civil
Keywords: Drilling Rate Index (DRI) | Variation | Temperature | Thermal damage | Prada limestone
Knowledge Area: Ingeniería del Terreno
Issue Date: 2021
Publisher: IOP Publishing
Citation: IOP Conference Series: Earth and Environmental Science. 2021, 833: 012053.
Abstract: This research evaluates the variation in the Drilling Rate Index (DRI) and its relationship with thermal damage on thermally treated rocks. Samples from 'Prada' limestone, a lower cretaceous formation in the southern Pyrenees (Lleida, Spain), were subjected to temperatures of 105, 300, 400 and 500 °C and then cooled at a slow rate. Ultrasound P-wave velocity tests were performed before and after heating the samples to evaluate the thermal damage experienced by the rock. Sievers' J miniature drill and brittleness tests were conducted on intact and thermally treated samples, and then resulting SJ and S20 values were combined to determine DRI. The obtained results show that thermal treatment allowed an increase of 34% in the DRI of 'Prada' limestone at 500 °C. DRI exhibited the same variation trend than S20, so we can conclude that thermal variation in DRI is more influenced by S20 than by SJ in 'Prada' limestone. We also report a strong relationship between DRI and P-wave velocity, confirming a tight dependence between the drilling performance and the thermally induced damage on the limestone. The observed substantial improvement in the drillability of the rock when heated, measured in terms of DRI value increase, could help in the advance on the development of thermally assisted mechanical excavation methods.
Sponsor: This work was supported by the Department of Geological and Geotechnical Engineering, Universitat Politècnica de València.
ISSN: 1755-1307 (Print) | 1755-1315 (Online)
DOI: 10.1088/1755-1315/833/1/012053
Language: eng
Type: info:eu-repo/semantics/article
Rights: Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Published under licence by IOP Publishing Ltd
Peer Review: si
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Appears in Collections:INV - INTERES - Artículos de Revistas

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