Dr. Saffet Yagiz is an Associate Professor in Mining Engineering Department in the Nazarbayev University School of Mining and Geosciences. Dr. Saffet Yagiz holds an MSc degree from the Missouri University of Science and Technology (1997) and a PhD degree from Colorado School of Mines (CSM, 2002) in the USA. His main research interests are engineering rock mechanics; mechanized rock excavation and tunneling; rock mass characteristics and testing; performance analysis of mechanical excavators; geo-technical site investigation and drilling. He has authored over 125 publications in peer-reviewed scientific journals, proceedings, reports, and books. He is a recognized reviewer of many mining & geotechnical engineering journals and Associate Editor of Tunneling and Underground Space Technology. Further, he has been participating in many conferences and scientific meetings as organizer, session chair, invited speaker, scientific committee member, speaker, or participant. Dr. Saffet Yagiz is a recognized academician with over 20 years’ experience in teaching, research, and consultancy. He has a broad spectrum of engineering rock mechanics and mechanized excavation and has played leadership roles within this spectrum via valuable publications and reports. He has been involved as a principal investigator or researcher in many research projects related to his specialty. He is known for the studies of developing the Modified CSM Model for TBM performance, TBM performance prediction formulas, and proposing rock brittleness index and classification for rock mechanics and excavation. He is a working group member of ISRM suggested method for determining rock bore ability and ISRM Suggested Method for Small-Scale Linear Rock Cutting Test. He is a professional member of the International Society for Rock Mechanics and Rock Engineering (ISRM).  

• MINE302 Geomechanics;
• MINE305 Rock Breakage;
• MINE502 Geology for Mining Engineers;
• MINE507 Rock Excavation Methods;
• MINE605/801 Mechanized Excavation & Tunnelling;
• MINE690/890 MSc and PhD Thesis Research.

• Geomechanics;
• Rock excavation and tunneling;
• Rock mass characteristics and testing;
• Performance analysis of mechanical excavators;
• Geo-technical site investigation.

Saffet Yagiz is a single author of 25/53 and the first author of 25/53 journal papers, and he is corresponding author of 30/51 of them. He published 23 journals with NU affiliations and four of them (Q1-Q2) with NU graduate students together with two under review.

• Yagiz S. Brief note on the influence of shape and percentage of gravel on shear strength of sand and gravel mixture. Bulletin of Eng., Geology and the Environment, 60, 321-323 (2001) (Q1)
• 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] (Q1)
• 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) (Q1)
• 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) (Q1)
• 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) (Q1)
• 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) (Q1)
• 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 5 articles in TUST in 2009]. (Q1)
• 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) (Q1)
• 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) (Q1)
• Yagiz S. Discussion on “Assessment of some brittleness indexes in rock-drilling efficiency” [RMRE, 43(3); 361-370]. Rock Mechanics and Rock Engineering, 43, 371-373 (2010) (Q1)
• Yagiz S. Geomechanical properties of construction stones quarried in Southwestern Turkey. Scientific Research and Essays, 5, 750-757 (2010) (Q3)
• 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) (Q1)
• Yagiz S. Correlation between slake durability and rock properties for some carbonate rocks. Bulletin of Engineering Geology and the Environment, 70, 377-383 (2011) (Q1)
• 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) (Q2)
• 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. Comments on the article “Performance prediction of hard rock TBM using Rock Mass Rating (RMR) system” [TUST, 25 (2010) 333-345]. Tunneling and Underground Space Technology, 26, 649-650 (2011) (Q1)
• 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) (Q1)
• 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) (Q1)
• Sen S, Sezer EA, 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) (Q2)
• Yagiz S. Comment on “Point load test on meta-sedimentary rocks and correlation to UCS and BTS”, [RMRE, 46(4); 889-896]. Rock Mechanics and Rock Engineering, 46, 909-912 (2013) (Q1)
• 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) (Q1)
• 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) (Q1)
• Frough O, Torabi SR, Yagiz S. Application of RMR for estimating rock mass related TBM utilization and performance parameters: A case study. Rock Mechanics and Rock Engineering, 48, 1305-1312 (2015) (Q1)
• 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) (Q1)
• Armaghani DJ, Mohamad ET, 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) (Q1)
• 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) (Q1)
• Khandelwal M, Faradonbeh R, Monjezi M, Armaghani DJ, Majid MZBA, 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) (Q1)
• Armaghani DJ, Mohamad ET, Narayanasamy MS, 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) (Q1)
• 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) (Q2)
• 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) (Q1)
• Adoko AC, Gokceoglu C, Yagiz S. Bayesian prediction of TBM penetration rate in rock mass. Engineering Geology, 226, 245-256 (2017) (Q1) (Data supplier and paper preparation, senior)
• Yagiz S. The effect of pH of testing liquid on degradability of carbonate rocks. Geotechnical and Geological Engineering, 36(4):2351–2363 (2018) (Q1)
• Yagiz S, Ghasemi E, Adoko AC. Prediction of rock brittleness using genetic algorithm and particle swarm optimization techniques. Geotechnical and Geological Engineering, 36(6);3767-3777 (2018) (Q1)
• Madani N, Yagiz S, Adoko AC. Spatial mapping of the rock quality designation using multi-gaussian kriging method. Minerals, 8(11): 530 (2018) (Q2) (as RQD data analyzer and model input variables)
• Yagiz S. Comments on the effects of density and porosity on the correlation between uniaxial compressive strength and P-wave velocity. Rock Mechanics and Rock Engineering 52(2): 635-638 (2019) (Q1)
• Adoko AC, Yagiz S. Fuzzy inference system based for TBM field penetration index estimation in rock mass. Geotechnical and Geological Engineering, 37(3);1533-1553 (2019) (Q1)
• Armaghani DJ, 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, 11(4): 779-789 (2019) (Q1)
• Koopialipoor M, Noorbakhsh A, Ghaleini EN, Armaghani DJ, Yagiz S. A new approach for estimation of rock brittleness based on non-destructive tests. Non-Destructive Testing and Evaluation, 34(4); 354-375 (2019) (Q2)
• 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, doi.org/10.1080/17480930.2019.1709012 (2020) (Q2)
• Ghadernejad S, Nejati H, Yagiz S. A new rock brittleness index on the basis of punch penetration test data. Geomechanics and Engineering, 21(4); 391-399. (2020) (Q2)
• 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. International Journal of Rock Mechanics and Mining Sciences, 135(104497), 16p. doi.org/10.1016/j.ijrmms.2020.104497 (2020) (Q1)
• Keshtegar B, Hasanipanah M, ThoiTroung N, Yagiz S,Amnieh, BH. Potential efficacy and application of mathematical-based regressed models to predict TBM performance. International Journal of Mining, Reclamation and Environment, doi.org/10.1080/17480930.2021.1878087 (2021) (Q2)
• Zhou J, Qiu Y, Zhu S, Armaghani DJ, Li C, Nguyen H, Yagiz S. Optimization of support vector machine through the use of metaheuristic algorithms in forecasting TBM advance rate. Engineering Applications of Artificial Intelligence, 97 (104015) (2021) (Q1) (As writing, idea contribution and senior)
• Goodarzi S, Hassanpour J, Yagiz* S, Rostami J. Predicting TBM performance in soft sedimentary rocks, case study of Zagros mountains water tunnel projects. Tunnelling and Underground Space Technology, doi.org/10.1016/j.tust.2020.103705. 109(103705) (2021) (Q1)
• Li C, Zhou J, Armaghani DJ, Cao W, Yagiz S. Stochastic assessment of hard rock pillar stability considering the Geological Strength Index system. Geomechanics and Geophysics for Geo-Energy and Geo-Resources, doi.org/10.1007/s40948-021-00243-8 vol.7; Article number: 47 (2021), (Q1)
• Armaghani D.J, Yagiz S, Mohamad E.T, Zhou J. Prediction of TBM performance in fresh through weathered granite using empirical and statistical approaches. Tunneling and Underground Space Technology, DOI: 10.1016/j.tust.2021.104183 (2021) (Q1)
• Yang J, Yagiz S, Liu Y-J, Laouafa F. A comprehensive evaluation of machine learning algorithms on application to predict TBM performance, doi.org/10.1016/j.undsp.2021.04.003l, Underground Space (Q1)
• Jie Y, Lie Y-J, Yagiz S, Laouafa F. An intelligent procedure for updating deformation of braced excavation in clay using Gated Recurrent Unit neural networks. International of Rock Mechanics and Geotechnical Engineering, doi.org/10.1016/j.jrmge.2021.07.011 (Q1)
• Parsajoo M, Mohammed AS, Yagiz* S, Armaghani DJ, Khandelwal M. An evolutionary adaptive Neuro-Fuzzy Inference System for estimating field penetration index of TBM in rock mass. International Journal of Rock Mechanics and Geotechnical Engineering, doi.org/10.1016/j.jrmge.2021.05.010 (Q1)
• Massalov T, Adoko AC, Rostami J, Yagiz S. Soft computing techniques to estimate cutter life index using mechanical properties of rocks, Appl. Sci.12(3),1446 (2022) doi.org/10.3390/app12031446 (Q2)
• Yazitova A, Yagiz S. Predicting the drilling rate of percussion and diamond drillers in rocks. (Under review, Q1) (As supervisor of student)

International Books and Chapters:

• Ozkul M, Yagiz S, Jones B. Proceedings of 1^st Symposium on Travertine, ISBN 975-6992-11-5 420p, 2005 Ankara, TR. https://www.amazon.com/Ozkul-Yagiz-Jones/dp/9756992115
• Yagiz S. Modified CSM Model for Predicting TBM Performance in Rock Mass, ISBN 978-3-659-59856-2, 252p, 2014 Germany. https://www.amazon.com/Modified-Model-Predicting-Performance-Rock/dp/3659598569
• Khandelwal M, Armaghani DJ, Bhatawdekar RM, Samui P, Yagiz S. Advancements in Underground Infrastructures, CRC, 2022 (Under process)

International Proceedings Papers and Presentations:

Saffet Yagiz 41 proceedings papers in prestigious meeting, conference, and symposium. 13 of them is under the affiliation of NU and 9 of them published with graduate students of SMG at NU. (2017-Oct, 2021)

• Yagiz S. Overview of classification and engineering properties of shale for design considerations. In: 2nd Congress on Construction and Materials Issues; American Society of Civil Engineers, Hancher DE. (Ed), 156-165. October 10-13, 2001. Houston, TX USA
• Cigla M, Yagiz S, Ozdemir L. Application of tunnel boring machines in underground mining development. In: 17th Int. Mining Congress & Exhibition of Turkey, 155-164. 2001. Ankara, Turkey
• 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
• Kaya A, Yagiz S. Influence of regional tectonics and geological structures on marble quarry operation: An example from Antalya Region. In: 1st International Symposium on Travertine, Ozkul M, et al. (Eds), 35-141, September 21-25 2005. Denizli, Turkey
• Aydın A, Yagiz S, Ozpınar Y, Semiz B. 2005. Investigation of travertine properties using geophysical methods. In: 1st International Symposium on Travertine, Ozkul M, et al. (Eds), 305-308, September 21-25 2005. Denizli, Turkey
• Yagiz S, Akyol E. Geomechanical assessment of travertine in Antalya Region. In: 1st International Symposium on Travertine. Ozkul M, et al. (Eds), 235-239. September 21-25, 2005. Denizli, TR.
• Akyol E, Yagiz S, Ozkul M, Sen G, Kato S. Physical properties of hot spring travertines related to lithotypes at Pamukkale Region in Denizli. In: 1st International Symposium on Travertine, Ozkul M, et al. (Eds), 286-290. September 21-25 2005. 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, in DVD. 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. A model for prediction of tunnel boring machine performance. In: 10th Int. Association of Engineering Geologists Congress. Substructures and Underground Space. Paper no. 383. 10p, in DVD. The Geological Society of London, September 6-10, 2006. UK.
• 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. 708p. May 9-12, 2006. Liege, Belgium.
• Yagiz S. Recent advancements in predicting TBM performance. In: 7th International Congress on Advances in Civil Engineering. 10p, in DVD. October 11-13, 2006. Istanbul, Turkey.
• 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. Nov., 24-26, 2008. Tehran, Iran.
• 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, Kim T, Ozdemir L, Merguerian C. Factors 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. 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, 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.
• Sen S, Sezer EA, 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
• Frough O, Torabi SR, 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, 9p. May 18-23, 2012, Bangkok, Thailand
• 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, Rostami. Indentation test for the measurement of rock brittleness. In: 46th U.S. Rock Mech., Geomechanics Symposium. A. Bobet (Eds), 6p. June 24-27, 2012. Chicago, USA
• 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.
• 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. 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, Gireson K, Kaval O, Arsay AA. Geomechanical aspects of gypsums and dolomites in Kızılyer (Denizli). In: 5th Global Stone Congress Proceedings Book. A. Tugrul et al (eds), 162-172, 2016. Antalya, Turkey
• Yagiz S. Overview on the earthquake potential of Çubuk District and surroundings. In: 1th International Symposium on Çubuk and Surroundings. H. Cinar et al., (Eds), 685-696, Oct 9-10 2016, Ankara, Turkey
• Yagiz S. Utilizing rock brittleness for estimating TBM penetration rate in rocks. In: 12th International Congress on Advances in Civil Engineering, in DVD. 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 in DVD. Paper no: ACE 16-1599 Sep 21-23 2016. Istanbul, Turkey
• Yagiz S. Interaction of rock mass characteristics with full-faced tunneling machine performance [Key Note], 3rd Regional Tunneling Congress, International Tunneling and Underground Space Association (ITA), 2017, Tehran, Iran
• 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, 2018, South Africa
• 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
• Yazitova A, Yagiz S. Prediction of drilling rate utilizing common rock properties and driller specifications: percussive driller. In: World Tunnelling Congress, 15-21 May 2020, K. Lumpur, Malaysia
• Massalov T. 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; Hard rock tunnelling and rock support, 15-19 June 2020, Trondheim, Norway
• Yazitova A, Yagiz S. Estimation of drilling rate of diamond drillers using rock properties and driller specifications. In: Eurock-2020; Hard rock tunnelling and rock support, 15-19 June 2020, Tronheim, Norway
• Yagiz S, Yarali O. Correlations between crucial rock properties and drilling rate index for hard rock tunnels. In: World Tunnelling Congress, 15-21 May 2020, Kuala Lumpur, Malaysia
• Yagiz S, Frough O, Rostami J. Evaluation of rock brittleness indices to estimate the Cerchar Abrasivity Index. 54th Rock Mechanics and Geomechanics Symposium, ARMA, 28 June-1 July 2020, Co, USA
• Yagiz S, Yermukhanbetov K, Yazitova A, Rostami J. Utilizing linear cutting machine test for estimating cutting force via intact rock properties. 55th U.S. Rock Mechanics and Geomechanics Symposium (ARMA) TX, USA
• Yagiz S, Shaterpour-Mamaghani A, Yazitova A, Yermukhanbetov K, Dogan E, Erdogan T, Copur H. Empirical models for estimating performance and operational parameters of raise boring machine in mining applications. IOP Conference Series Earth and Environmental Science; ISRM International Symposium, Eurock2021-Mechanics and Rock Engineering from theory to practice. doi.org/10.1088/1755-1315/833/1/012129, 20-25 September 2021, Torino, Italy
• Yermukhanbetov K, Yazitova A, Yagiz S. Comparison of strength-based rock brittleness indices with the brittleness index measured via Yagiz's approaches. IOP Conference Series Earth and Environmental Science; ISRM International Symposium, Eurock2021-Mechanics and Rock Engineering from theory to practice. doi.org/10.1088/1755-1315/833/1/012038, 20-25 September 2021, Torino, Italy
• Massalov T, Yagiz S, Adoko AC, Rostami J. Estimation of cutter life index based on common rock properties. Eurock2022-Rock and Fracture Mechanics in Rock Engineering and Mining, 9-15 September 2022, Helsinki, Finland
• Yagiz S. Examining factors influencing the full-face machine advancement in rock masses [keynote], in International Conference on Geotechnical Challenges in Mining, Tunneling & Underground Structures. 20-21 December 2021, Johor Bahru, Malaysia

Abstract Presentations:

1. International Abstract Presentations

• Yagiz S. Evaluation of rock mass classifications for supporting TBM tunnels. 43rd Annual Meeting of Association of Engineering Geologists. In: Program with Abstracts. Technical Session 23: Material Characterization. p122. September 19-26, 2000. San Hose, CA USA [The best student presentation of AEG 2000].
• Yagiz S. Geotechnical aspects of Turkish Earthquake, 17 August 1999. In: 44th Annual Meeting of Association of Engineering Geologists. In: Program with Abstracts. Technical Session 11: Natural Hazards: Recognition and Risk Assessment. p80. Sept, 29-October 7, 2001. Saint Louis, MO USA.
• Yagiz S, Ozdemir L. Geotechnical parameters influencing the TBM performance in various rocks. In: 44th Annual Meeting of Association of Engineering Geologists. In: Program with Abstracts. Technical Session 10: Engineering Geology for Construction Practices. p79. September 29-October 7, 2001. Saint Louis, MO USA.
• Yagiz S. Application of rock engineering in mechanical tunneling. In: 45th Annual Meeting of Association of Engineering Geologists. In: Program with Abstracts. Technical Session 12: Transportation Engineering Geology. p82. September 23-29, 2002. Reno, NV USA.
• Yagiz S, Arsay A.A. Travertine as a construction material. In: 12th International Congress for Applied Mineralogy, Construction Material Section, August 10-12, 2015, Istanbul
• Yagiz S, Gireson K, Kaval O, Arsay AA. Geomechanical aspects of gypsums and dolomites in Kızılyer (Denizli), in: V. Global Stone Congress, September 2014. Antalya, Turkey
• Yagiz S, Gokceoglu C, Sezer E. Comparison of two non-linear prediction techniques for estimation of some intact rock parameters. In: European Geosciences Union, General Assembly, Geophysical Research Abstracts, 2010. Vienna, Austria

1. National Abstract Presentations

• Yagiz S. A model for prediction of TBM performance in hard rock condition. In: 56th Geological Congress of Turkey, Abstract, p227, MTA General Directory, April 14-20, 2003. Ankara, Turkey
• Yagiz S. Relationship between intact and mass rock properties with TBM performance. In: 57th Geological Congress of Turkey, Abstract, p175, MTA General Directory, March 8-12, 2004. Ankara, Turkey
• Yagiz S. Correlation between uniaxial compressive strength and brittleness of selected rock types. In: 57th Geological Congress of Turkey, Abstract, p160, MTA General Directory, March 8-12, 2004. Ankara, Turkey
• Kumsar H, Yagiz S, Ozkul M, Sen G. Geotechnical investigation of additional construction area of Denizli Organize Industry Region. In: 58th Geological Congress of Turkey, Abstract, p187, MTA General Directory, April, 11-17, 2005. Ankara, Turkey
• Yagiz S. An investigation on the relationship between rock strength and brittleness. In: 59th Geological Congress of Turkey, Abstract, p352, MTA General Directory, March, 20-24, 2006. Ankara, Turkey
• Yagiz S, Tuzcuoglu MB, Uysal M. The relationship between Schmidt hardness values, uniaxial compressive strength and index properties of weak rocks. In: 61th Geological Congress of Turkey, Abstract, p41, MTA General Directory, March, 24-28, 2008. Ankara, Turkey
• Yagiz S. Using indentation test to compute rock brittleness index. In: 62th Geological Congress of Turkey, Abstract, p400, MTA General Directory, April 13-17, 2009. Ankara, Turkey
• Yagiz S, Zorlu K. Using fractal dimension approach to investigate effect of slake durability index cycle integer on aggregate shape. In: 62th Geological Congress of Turkey, Abstract, p398, MTA General Directory, April 13-17, 2009. Ankara, Turkey
• Yagiz S, Kim T, Merguerian C. Factors affecting the advancement of full-face tunnel boring machine. In: 63th Geological Congress of Turkey, Abstract, p200-201, MTA General Directory, April 5-9, 2010. Ankara, Turkey