The Effect of Geological Factor in Penetration Rate in Core Drilling Case Study: Nakhlak Mine

Document Type : Original Article

Authors

Professor, Department of Engineering Geology, Isfahan University

Abstract

Core drilling is one of the most important processes in geotechnical and mining projects, and accurate of the factors affecting its efficiency is importance role in advancing the project. In this study, the effect of geological factors of Nakhlak mine samples has been investigated and their effect on drilling penetration rate has been evaluated.

According to the researches on four rock types from Nakhlak mine, about 35 thousand meters of core drilling, it has been determined that by reducing sorting (well grading), unite weight and rock engineering properties (strength, durability, Seismic waves velocity ...) increase and the amount of porosity and water absorption decreases. This causes the decrease penetration rate of rocks. The amount of quartz mineral in the rock is also an important factor in reducing the penetration rate. Dolomitic matrix of rocks can increase porosity and penetration rate. One of the most important factor affecting on penetration rate in rock mass is the density of joints and RQD. The results show that the penetration rate increase as 160% in exchange RQD index from 60% to 80%.

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Scientific Quarterly Journal of Iranian Association of Engineering Geology
Volume 16, Issue 3
December 2023
Pages 21-34

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History

  • Receive Date: 12 March 2022
  • Revise Date: 14 November 2023
  • Accept Date: 17 December 2023

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