PSI - Issue 68

ScienceDirect Available online at www.sciencedirect.com ScienceDirect Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2025) 000–000 Available online at www.sciencedirect.com Procedia Structural Integrity 68 (2025) 722–726 Structural Integrity Procedia 00 (2025) 000–000

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European Conference on Fracture 2024 Predicting the penetration rate of diamond core drilling of igneous rocks using P-wave velocity European Conference on Fracture 2024 Predicting the penetration rate of diamond core drilling of igneous rocks using P-wave velocity Sair Kahraman a, *, Abdalrahim A.M. Malakni b a Mining Engineering Department, Hacettepe University, Ankara, Türkiye b Graduate School of Science and Engineering, Hacettepe University, Ankara, Türkiye Abstract This paper investigates the predictability of the penetration rate (PR) of diamond core drilling of igneous rocks using P-wave velocity measurement which is a non-destructive testing method. For this purpose, forty-two drilling tests were conducted in the laboratory using an instrumented diamond core drilling machine. During the drilling tests, the parameters of PR, thrust (weight on bit), and rotational speed (rpm) were recorded. Then P-wave velocity measurements were performed on each core sample. After that multiple regression analysis was performed by including, thrust, rotational speed, and the P-wave velocity values to the analysis to develop an estimation equation for PR. A model with a very high correlation coefficient (r = 0.98) was derived for the PR prediction. It was concluded that the derived equation could be used to estimate the PR of a diamond core bit when drilling igneous rocks. Keywords: Dimond drilling, penetration rate, P-wave velocity; igneous rocks 1. Introduction Diamond core drilling is frequently utilized for exploration and geotechnical investigation in mining, oil and gas, and construction industries. Planning and cost estimation for drilling projects depend on the accurate estimation of the penetration rate (PR) or drilling velocity. PR is influenced by operational parameters (such as thrust, rotational speed, and torque) and rock properties. A PR equation that can be used in practice must include these parameters. In most studies, the parameters affecting PR were examined individually. In a few studies, both operating parameters and rock properties were considered. Akün and Karpuz (1990) and Akün and Karpuz (2005) developed PR equations © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ECF24 organizers Sair Kahraman a, *, Abdalrahim A.M. Malakni b a Mining Engineering Department, Hacettepe University, Ankara, Türkiye b Graduate School of Science and Engineering, Hacettepe University, Ankara, Türkiye Abstract This paper investigates the predictability of the penetration rate (PR) of diamond core drilling of igneous rocks using P-wave velocity measurement which is a non-destructive testing method. For this purpose, forty-two drilling tests were conducted in the laboratory using an instrumented diamond core drilling machine. During the drilling tests, the parameters of PR, thrust (weight on bit), and rotational speed (rpm) were recorded. Then P-wave velocity measurements were performed on each core sample. After that multiple regression analysis was performed by including, thrust, rotational speed, and the P-wave velocity values to the analysis to develop an estimation equation for PR. A model with a very high correlation coefficient (r = 0.98) was derived for the PR prediction. It was concluded that the derived equation could be used to estimate the PR of a diamond core bit when drilling igneous rocks. Keywords: Dimond drilling, penetration rate, P-wave velocity; igneous rocks 1. Introduction Diamond core drilling is frequently utilized for exploration and geotechnical investigation in mining, oil and gas, and construction industries. Planning and cost estimation for drilling projects depend on the accurate estimation of the penetration rate (PR) or drilling velocity. PR is influenced by operational parameters (such as thrust, rotational speed, and torque) and rock properties. A PR equation that can be used in practice must include these parameters. In most studies, the parameters affecting PR were examined individually. In a few studies, both operating parameters and rock properties were considered. Akün and Karpuz (1990) and Akün and Karpuz (2005) developed PR equations

* Corresponding author. Tel.: +90-312-2977600; fax: +90-312-2992155 E-mail address: sairkahraman@yahoo.com

2452-3216 © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ECF24 organizers 10.1016/j.prostr.2025.06.121 2452-3216 © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ECF24 organizers 2452-3216 © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ECF24 organizers * Corresponding author. Tel.: +90-312-2977600; fax: +90-312-2992155 E-mail address: sairkahraman@yahoo.com