Correlations between crucial rock properties and drilling rate index for hard rock tunnels

S Yagiz, O Yarali

Research output: Chapter in Book/Report/Conference proceedingConference contribution


In this paper, rock properties including uniaxial compressive strength (UCS), Brazilian tensile strength (BTS) and density (D) of rock is examined to estimate the drilling rate index (DRI) for hard rock tunneling. For this aim, dataset having 63 data-points is established and then several linear and non-linear simple and multiple regression models have been conducted to develop the most accurate model to estimate the DRI. As a result of simple regressions, it is found that the UCS, BTS and D have an effect on DRI with correlation coefficient (r) of 0.55; 0.61; 0.28 respectively. It is obvious that those results are not good enough to estimate the DRI as a function of single parameter; however, applying multiple regression analysis, drilling rate index is predicted as a function of UCS, BTS and D of rocks with r of 0.75.
Original languageEnglish
Title of host publicationWorld Tunnelling Congress, WTC2020 Malaysia
PublisherInternational Tunnelling and Underground Space Association
Number of pages5
Publication statusPublished - May 2020
EventWorld Tunnelling Congress WTC2020 - Malaysia, Kuala Lumpur, Malaysia
Duration: May 15 2020May 22 2020


ConferenceWorld Tunnelling Congress WTC2020
Abbreviated titleWTC2020
CityKuala Lumpur
Internet address

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