Саффет Ягыз


Электр. пошта


  • PhD. Colorado School of Mines, USA
  • M.Sc. Missouri University of Science & Technology, USA
  • B.Sc. University of Ankara, Ankara, Turkey

Employment History:

  • 2017 to date: Associate Professor of Mining Engineering, School of Mining and Geosciences, Nazarbayev University, Nur-Sultan city, Kazakhstan
  • 2016 – 2017: Professor, School of Engineering, Pamukkale University, TR
  • 2012 – 2013: Research Professor, Penn State University, Energy and Mineral Engineering, USA
  • 2011 – 2014: Appointed as the Director of Foreign Languages School of Pamukkale University, TR
  • 2010 – 2016: Associate Professor, School of Engineering, Pamukkale University, TR
  • 2003 – 2010: Assistant Professor, School of Engineering, Pamukkale University, TR
  • 2002 – 2003: Post-Doctoral Fellow, Excavation Engineering & Earth Mechanics Institute of Colorado School of Mines, USA
  • 1998 – 2002: Research Assistant, Excavation Engineering & Earth Mechanics Institute of Colorado School of Mines, USA
  • 1997 – 2002: Teaching Assistant, Department of Mining Engineering, Colorado School of Mines, USA
  • 1993 – 1994: Teaching Assistant,  School of Engineering, University of Nigde, Nigde City, TR
  • 1992 – 1993: Internship, Turkish Government Petroleum Company, (TPAO), Ankara, TR


  • Editorial Board Member of Tunnelling and Underground Space Technology Journal, Elsevier (2019-)
  • Outstanding reviewer of the years (2015 & 2017) recognized by Editorial Board of Tunneling and Underground Space Technology, Elsevier, Netherland
  • Key Note Speaker: 3rd Regional Tunnelling Conference (2017), Tehran, Iran
  • Scholarship from Scientific and Technological Research Council of Turkey (TUBITAK) (2012-2013), TR
  • The best journal paper, as listed Yagiz (2008), awarded by National Group of International Association of Engineering Geologists, (Erguvanli Paper Award in 2009) TR
  • The best graduate student of the year (2000) in the USA recognized by Turkish Government, TR
  • Turkish Government Scholarship (in top 5) for Advanced Study in USA (1995-2002)

Research Interests:

  • Rock Mechanics & Engineering
  • Mechanized Excavation & Tunnelling
  • Rock Mass Characteristics & Testing
  • Performance Analysis of Mechanical Excavators
  • Geo-technical Site Investigation & Drilling

Lectures involved:

  • MINExxx Introduction to Natural Resources Extraction (BSc)
  • MINExxx Tunnelling (BSc)
  • MINExxx Foundation of Mining (MSc)
  • MINExxx Geology for Mining Engineers (MSc)
  • MINE507 Rock Excavation Methods (MSc)
  • MINExxx Research Methods & Ethics (MSc)
  • MINExxx Mechanized Excavation & Tunnelling (MSc)
  • MINExxx Advanced Mechanized Excavation & Tunnelling (PhD)

Journal Publications (in Scopus with h-index=17 as of June, 2019)

  • Yagiz S. Utilizing rock mass properties for predicting TBM performance in hard rock condition. Tunneling and Underground Space Technology, 23: 326-339 (2008). [The best paper awarded by National Committee of IAEG, Top Hottest 5 articles in TUST in 2008, also in a collection of papers from 1986 to 2016; Development and Application of Tunnel Boring Machines in the Last 30 Years].
  • Yagiz S, Akyol E, Sen G. Relationship between standard penetration and pressuremeter test on sandy silty clays: A case study from Denizli. Bulletin of Engineering Geology and  the Environment, 67: 405-410 (2008)
  • Yagiz S. Assessment of brittleness using rock strength and density with punch penetration test. Tunneling and Underground Space Technology, 24: 66-74 (2009). [Top Hottest 10 articles in TUST in 2009].
  • Yagiz S. Predicting uniaxial compressive strength, modules of elasticity and index properties of rocks using Schmidt hammer. Bulletin of Engineering Geology and the Environment, 68: 55-63 (2009)
  • Yagiz S. Discussion on the article ‘‘Influence of rock brittleness on TBM penetration rate in Singapore Granite” [TUST, 22 (2007) 317–324] and [TUST, 23 (2008) 217–218]. Tunneling and Underground Space Technology, 24:115-116 (2009)
  • Yagiz S, Gokceoglu C, Sezer E, Iplikci S. Application of two non-linear prediction tools to the estimation of tunnel boring machine performance. International Journal of Engineering Application of Artificial Intelligence, 22: 818-824 (2009)
  • Yagiz S. Discussion on the paper entitled “Indentation hardness test to estimate the sawability of carbonate rocks”, [Bull Eng Geol and the Environ. 67, 507-511].  Bulletin of Engineering Geology and the Environment, 68: 437-439 (2009)
  • Yagiz S. Comments on “Multifactorial fuzzy approach to the penetrability classification of TBM in hard rock conditions” [TUST, 24 (2009) 500-505]. Tunneling and Underground Space Technology, 25: 95-96 (2010)
  • Yagiz S, Gokceoglu C. Application of fuzzy inference and non-linear regression methods for predicting rock brittleness. Expert Systems with Applications, 37: 2265-2272 (2010)
  • Yagiz S. Discussion on “Assessment of some brittleness indexes in rock-drilling efficiency” [RMRE, 43(3); 361-370]. Journal of Rock Mechanics and Rock Engineering, 43: 371-373 (2010)
  • Yagiz S. Geomechanical properties of construction stones quarried in Southwestern Turkey. Scientific Research and Essays, 5: 750-757 (2010)
  • Yagiz S. Correlation between slake durability and rock properties for some carbonate rocks. Bulletin of Engineering Geology and the Environment, 70: 377-383 (2011)
  • Yagiz S. Comments on the article “Performance prediction of hard rock TBM using Rock Mass Rating (RMR) system” [TUST, 25 (2010) 333-345]. Tunneling & Underground Space Technology, 26:649-650 (2011)
  • Yagiz S, Karahan H. Prediction of hard rock TBM penetration rate using particle swarm optimization. International Journal of Rock Mechanics and Mining Sciences, 48: 427-433 (2011)
  • Yagiz S. P-wave velocity test for the assessment of some geotechnical properties of rock materials. Bulletin of Materials Science, 34(9): 43-957 (2011)
  • Yagiz S. Comment on “Point load test on meta-sedimentary rocks and correlation to UCS and BTS”, [RMRE, 46(4); 889-896]. Journal of Rock Mechanics and Rock Engineering, 46: 909-912 (2013)
  • Yagiz S, Sezer EA, Gokceoglu C. Artificial neural networks and nonlinear regression techniques to assess the influence of slake durability cycles on the prediction of uniaxial compressive strength and modulus of elasticity for carbonate rocks. International Journal of Numerical and Analytical Methods in Geomechanics, 36: 1636-1650 (2012)
  • Yagiz S. Comments on “Determination of strength parameters and quality assessment of Denizli travertines (SW Turkey)” [Eng Geol, 129–130 (2012) 38–47]. Engineering Geology, 147–148: 149-150 (2012)
  • Sen S, Sezer E.A, Gokceoglu C, Yagiz S. On sampling strategies for small and continuous data with the modeling of genetic programming and adaptive neuro-fuzzy inference system. Journal of Intelligent & Fuzzy Systems (Special Issue), 23: 297-303 (2012)
  • Ghasemi E, Yagiz S, Ataei M. Predicting penetration rate of hard rock tunnel boring machine using fuzzy logic. Bulletin of Engineering Geology and the Environment, 73: 23-35 (2014)
  • Mahdevari S, Shahriar K, Yagiz S, Shirazi MA. A support vector regression model for predicting tunnel boring machine penetration rates. International Journal of Rock Mechanics and Mining Sciences, 72: 214-229 (2014)
  • Yagiz S, Karahan H. Application of various optimization techniques and comparison of their performances for predicting TBM penetration rate in rock mass. International Journal of Rock Mechanics and Mining Sciences, 80: 308-315 (2015)
  • Frough O, Torabi S.R, Yagiz S. Application of RMR for estimating rock mass related TBM utilization and performance parameters: A case study. Journal of Rock Mechanics and Rock Engineering, 48: 1305-1312 (2015)
  • Armaghani DJ, Amin MFM, Yagiz S, Faradonbeh R, Abdullah RA. Prediction of the uniaxial compressive strength of sandstone using various modelling techniques. International Journal of Rock Mechanics and Mining Sciences, 85: 174-186 (2016)
  • Armaghani DJ, Mohamad E.T, Hajihassanic M, Yagiz S, Motaghedie H. Application of several non-linear prediction tools for estimating uniaxial compressive strength of granitic rocks and comparison of their performances. Engineering with Computers, 32: 189-206 (2016)
  • Yagiz S. New equations for predicting the field penetration index of tunnel boring machines in fractured rock mass. Arabian Journal of Geosciences, 10:33 (2017)
  • Armaghani DJ, Mohamad E.T, Narayanasamy M.S, Narita N, Yagiz S. Development of hybrid intelligent models for predicting TBM penetration rate in hard rock condition. Tunneling and Underground Space Technology, 63: 29-43 (2017)
  • Khandelwal M, Faradonbeh R, Monjezi M, Armaghani D.J, Majid M.Z.B.A, Yagiz S. Function development for appraising brittleness of intact rocks using genetic programming and non‑linear multiple regression models. Engineering with Computers, 33: 13-21 (2017)
  • Ghasemi E, Kalhori H, Bagherpour R, Yagiz S. Model tree approach for determining uniaxial compressive strength and Young’s modulus of carbonate rocks. Bulletin of Engineering Geology and the Environment, 77(1): 331-343 (2018)
  • Adoko A.C, Gokceoglu C, Yagiz S. Bayesian prediction of TBM penetration rate in rock mass. Engineering Geology, 226: 245-256 (2017)
  • Yagiz S, Ghasemi E, Adoko A.C. Prediction of rock brittleness using genetic algorithm and particle swarm optimization techniques. Journal of Geotechnical and Geological Engineering, 36(6): 3767-3777 (2018)
  • Madani N, Yagiz S, Adoko A.C. Spatial mapping of the rock quality designation using multi-gaussian  kriging method. Minerals, 8(11): 530 (2018)
  • Yagiz S. The effect of pH of testing liquid on degradability of carbonate rocks. Journal of Geotechnical and Geological Engineering, 36(4): 2351–2363 (2018)
  • Adoko A.C, Yagiz S. Fuzzy inference system-based for TBM field penetration index estimation in rock mass. Journal of Geotechnical and Geological Engineering, 37(3): 1533-1553 (2019)
  • Yagiz S. Comments on the effects of density and porosity on the correlation between uniaxial compressive strength and P-wave velocity. Journal of Rock Mechanics and Rock Engineering 52(2): 635-638 (2019)
  • Koopialipoor M, Noorbakhsh A, Ghaleini E.N, Armaghani D.J, Yagiz S. A new approach for estimation of rock brittleness based on non-destructive tests. Journal of Non-Destructive Testing and Evaluation, (online)
  • Armaghani D.J, Marto A, Koopialipoor M, Yagiz S. Application of several optimization techniques for estimating TBM advance rate in granitic rocks. Journal of Rock Mechanics and Geotechnical Engineering, 3(11): xx-xx (2019) (online)
  • Yagiz S, Yazitova A, Karahan H. Application of differential evolution algorithm and comparing its performance with literature to predict rock brittleness for excavatability. International Journal of Mining, Reclamation and Environment, (20XX_Underreview)
  • Buyuksagis I.S, Rostami J, Yagiz S. Development of models for estimating specific energy and specific wear rate of circular diamond saw blades based on properties of carbonate rocks. Wear, (20XX_Underreview)
  • Armaghani D.J, Yagiz S, Mohamad E.T, Zhou J. Prediction of TBM performance in fresh through weathered granite using empirical and statistical approaches. Automation in Construction, (20XX_Underreview)

Selected Proceedings:

  • Yazitova A, Yagiz S. Estimation of drilling rate utilizing rock properties and driller specifications for percussion drilling. In: Eurock-2020, June 15-19 2020. Tronheim, Norway
  • Yazitova A, Yagiz S. Prediction of drilling rate using rock properties and driller specifications for diamond drilling. In: World Tunnelling Congress, WTC2020, May 15-21 2020. Kuala Lumpur, Malaysia
  • Yagiz S, Rostami J. Relationship between key rock properties and Cerchar abrasivity index for estimation of disc cutter wear life in rock tunneling applications. In: Eurock-2020, June 15-19 2020, Tronheim, Norway
  • Yagiz S, Yarali O. Correlations between crucial rock properties and drilling rate index for hard rock tunnels. In: World Tunnelling Congress, WTC2020, May 15-21 2020. Kuala Lumpur, Malaysia
  • Yagiz S. Yazitova A. Using intact rock brittleness for estimating TBM penetration. In: 4th International Conference on Geotechnical Research and Engineering, 7-9 April 2019, Roma, Italy
  • Madani N, Yagiz S, Adoko AC, Battalgazy N. Uncertainty quantification of rock quality designation at the Gazestan Phosphate deposit. In: Geometallurgy Conference, 14p, Cape Town, South Africa (2018)
  • Yagiz S. Interaction of rock mass characteristics with full-faced tunneling machine performance [Key Lecture]. In: 3rd Regional Tunneling Congress, Sponsored by ITA, 17-19, November; 2017. Tehran, Iran
  • Yagiz S. Utilizing rock brittleness for estimating TBM penetration rate in rocks. In: 12th International Congress on Advances in Civil Engineering, Paper no: ACE 16-1596. Sep 21-23 2016. Istanbul, Turkey
  • Yagiz S. Physical and mechanical properties of travertines utilized for constructions: an example from Denizli. In: 12th International Congress on Advances in Civil Engineering, Paper no: ACE 16-1599 Sep 21-23 2016. Istanbul, Turkey
  • Yagiz S, Gireson K, Kaval O, Arsay AA. Geomechanical aspects of gypsums and dolomites in Kızılyer (Denizli). In: 5th Global Stone Congress Proceedings, Tugrul et al (eds), 162-172, 2016. Antalya, Turkey
  • Yagiz S. The punch penetration test for estimating machine advancement. In: No-Dig Istanbul 2015, 33rd International Congress and Exhibition, in DVD. Paper no: 41 2015. Istanbul, TR
  • Yagiz S, Kim T, Frough O, Torabi SR. Rock mass rating system for predicting TBM utilization. In: Eurock’12-Rock Mechanics for Resources, Energy and Environment, Kwasniewski, M, et al. (Eds), 921-925. September 23-26, 2013. Wroclaw, Poland.
  • Yagiz S, Rostami J. Indentation test for the measurement of rock brittleness. In: 46thS. Rock Mechanics & Geomechanics Symposium, A. Bobet (Eds), 6p. June 24-27, 2012. Chicago, USA
  • Yagiz S, Rostami J, Ozdemir L. Colorado School of Mines approach for predicting TBM performance. In: Eurock’12-Rock Engineering and Technology for Sustainable Underground Construction, Stille H. et al. (Eds) 9p. May 28-30, 2012. Stockholm, Sweden.
  • Yagiz S, Gireson K, Kaval O. Geomechanical and industrial aspects of natural stones quarried in Denizli Surroundings. In: Proceedings of 8th International Marble and Natural Stone Congress, Ersoy B, et al. (Eds), 12p. December 13-15, 2012. Afyon, Turkey.
  • Frough O, Torabi S.R, Yagiz S, Tajik M. Effect of rock mass conditions on TBM utilization factor in Karaj-Tehran Water Conveyance Tunnel. In: ITA-AITES World Tunnel Congress & 38th General Assembly, May 18-23, 2012, Bangkok, Thailand
  • Sen S, Sezer E.A, Gokceoglu C, Yagiz S. On sampling strategies for small and continuous data with the modeling of Genetic Programming and ANFIS. In: 2nd International Fuzzy Systems Symposium, Gokceoglu C, et al. (Eds), 199-202, November 17-18, 2011. Turkey
  • Yagiz S, Merguerian C, Kim T. Geological controls on the breakthrough of tunnel boring machines in hard rock crystalline terrains. In: Eurock’10-Rock Mechanics in Civil and Environmental Engineering, Zhao J. et al. (Eds), 4p. June 15-18, 2010. Lausanne, Switzerland.
  • Yagiz S. Travertine as construction and building material. In: 2nd International Symposium on Sustainable Development, Padem H. et al (Eds), 667-673, June 8-9, 2010. Sarajevo, Bosnia- Herzegovina.
  • Yagiz S, Rostami J, Kim T, Ozdemir L, Merguerian C. Factor’s influencing performance of hard rock tunnel boring machine. In: Eurock’09-Rock Engineering in Difficult Ground Conditions, Vrkljan I. (Ed), 695-700. October 21-31, 2009. Cavtat, Croatia.
  • Yagiz S. Geotechnical considerations on TBM tunneling in rock media. In: 2nd International Conference on New Developments in Soil Mechanics and Geotechnical Engineering, Atalar C, et al. (Eds), 504-511. May 28-30, 2009. Nicosia, Northern Cyprus.
  • Yagiz S, Rostami J, Ozdemir L. Recommended rock testing methods for predicting TBM performance: focus on the CSM and NTNU Models. In: 5th Asian Rock Mechanics Symposium, Majdi A, Ghazvinian A. (Eds), 1520-1530. November 24-26, 2008. Tehran, Iran.
  • Yagiz S. Recent advancements in predicting TBM performance. In: 7th International Congress on Advances in Civil Engineering, October 11-13, 2006. Istanbul, Turkey.
  • Yagiz S. TBM performance prediction based on rock properties. In: Eurock’06-Multiphysics Coupling and Long Term Behavior in Rock Mechanics, Cotthem AV, et al. (Eds), 663-670. May 9-12, 2006. Liege, Belgium.
  • Yagiz S. A model for prediction of tunnel boring machine performance. In: 10th Association of Engineering Geologists Congress. Substructures and Underground Space, Paper no. 383. 10p, the Geological Society of London, September 6-10, 2006. UK.
  • Yagiz S. Machine selection criteria for mechanical excavation of natural materials. In: 11th International Material Symposium, Kovan, V. (Ed), 113-117. April 19-21, 2006. Denizli, Turkey
  • Yagiz S. Overview on geo-mechanical assessments of Denizli travertines in Turkey. In: 10th International Association of Engineering Geologists Congress. City Resources, Paper no. 384. 7p, the Geological Society of London, September 6-10, 2006. UK.
  • Yagiz S, Cheema S. Review and comparison of rock mass classification systems. In: Pakistan Engineering Congress, 2001-2002, paper no. 629, 449-460. 2001. Lahore, Pakistan
  • Cigla M, Yagiz S, Ozdemir L. Application of tunnel boring machines in underground mining development. In: 17th International Mining Congress & Exhibition of Turkey, 155-164. 2001. Ankara, Turkey
  • Yagiz S. Overview of classification and engineering properties of shale for design considerations. In: 2nd Congress on Construction and Materials Issues, (ASCE), Hancher DE. (Ed), 156-165. October 10-13, 2001. Houston, TX USA