
Mehmet SariAksaray University · Department of Mining Engineering
Mehmet Sari
Doctor of Philosophy
Co-Editor-in-Chief at Global J. Earth Sci. Eng. (Avanti Pub.)
Associate Editor at Arabian J. Geosci. (Springer-Verlag)
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52
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Introduction
Dr. Mehmet Sari works as Professor of the Mining Engineering Department at Aksaray University, Turkey. He obtained his B.Sc. from Middle East Technical University (METU), Ankara, Turkey in 1993. He obtained his M.Sc. from the University of Arizona, Tucson, USA in 1997. He completed his Ph.D. at METU in 2002. Dr. Sari's current research interests are risk analysis studies in mines, Monte Carlo simulation, rock mechanics, drilling and blasting, slope stability, fuzzy logic, and rockfall analysis.
Additional affiliations
Education
October 1998 - September 2002
August 1995 - December 1997
October 1988 - September 1993
Publications
Publications (52)
The representative elementary volume (REV) of a jointed rock mass can be determined using finite numerical analysis, but the effect of using different finite element model settings has not been widely studied. This paper aims to compare various finite element codes and their settings for determining the REV size of an excavated jointed rock mass. W...
This is an appendix of the article "Evaluating rockfalls at a historical settlement in the Ihlara Valley (Cappadocia, Turkey) using kinematic, numerical, 2D trajectory, and risk rating methods" published in the Journal of Mountain Science.
Rockfalls are one of the most dangerous natural events in hilly terrains, and they substantially threaten residential areas and transport corridors in these environments. This study is aimed to analyze the risk of rockfall from a slope to nearby houses in a historical settlement with past rockfall histories. It contains numerous applications to stu...
Rockburst (RB) is known as one of the deadliest and most destructive geotechnical events in deep underground spaces under high stresses. The complexity of the RB phenomenon and uncertainty arising from variability in geotechnical and geomechanical conditions makes its prediction very difficult. The current study is an attempt to address the suitabi...
This is an appendix of the article "Two- and three-dimensional stability analysis of underground storage caverns in soft rock (Cappadocia, Turkey) by finite element method" published in the Journal of Mountain Science.
Engineering design in soft rocks and its stability analysis exerts many challenges to rock engineers. Many engineering works in Turkey's Cappadocia region must face and tackle the existing sites covered by the soft rocks. This study is aimed to examine the stability condition of a typical underground storage cavern (USC) excavated in a soft rock in...
Undoubtedly, as a result of the large-scale accidents that occurred in the near past in the underground coal mining industry, the issue of the necessary safety precautions and measures to be taken in coal mines has re-emerged. Within the purpose of this study, a risk-based classification of the coal mine basins (CBs) in Turkey’s hierarchy was creat...
Representative elementary volume (REV) is defined as the usual size of a rock mass
structure beyond which its mechanical properties are homogenous and isotropic, and
its behavior can be modeled using the equivalent continuum approach. Determination
of REV is a complex problem in rock engineering due to its definition ambiguity and
application area....
Kizilkaya ignimbrite, characterized by a blocky structure in the Ihlara Valley (Cappadocia, Turkey), poses many hazards to visitors and the human-made churches and dwellings carved in the valley slopes. The instability mechanism in the valley should be carefully investigated to determine and implement a suitable prevention method. For this purpose,...
Representative elementary volume (REV) is defined as the usual size of a rock mass structure beyond which its mechanical properties are homogenous and isotropic, and its behavior can be modeled using the equivalent continuum approach. Determination of REV is a complex problem in rock engineering due to its definition ambiguity and application area....
Rockfalls are one of the most dangerous natural events in hilly terrains. This study presents the results of an investigation program to analyze the possibility of a rockfall from a slope to nearby residential buildings in a historical settlement area. Various rockfall analysis techniques were implemented in the study for this purpose. The kinemati...
In this study, the effects of physical and mechanical properties of the rocks on the performance of impact hammers used to crush boulders in muck piles were investigated for seven different quarries operating in Niğde province. For this purpose, the muck piles produced after drilling and blasting were analysed using image processing method to deter...
The analysis of stability of slopes is a classical problem for geotechnical engineers. In practice, many methods are available for the desired purpose, from basic kinematic analysis to two- and three-dimensional limit equilibrium analyses and numerical modeling with various user-friendly softwares. However, additional techniques are also required t...
The stability of natural and man-made rock slopes has always been of great concern for engineering geology studies. To ensure a safe and functional design of excavated slopes, the first and most crucial step is to use reliable input parameters while searching for possible failure modes at the preliminary design stage. It is highly important for pra...
Due to its complex nature and inherent uncertainty, it is very hard to directly measure the uniaxial strength of jointed rock masses. In rock mechanics, it is a necessity to employ empirical equations and numerical methods for the estimation of rock mass uniaxial strength. In addition to the existing empirical equations and numerical methods, it is...
The paper is presented in 1st Conference of the Arabian Journal of Geosciences-(CAJG) 2018, Hammamet, Tunisia
In the literature on rock mechanics, several authors have proposed different constants and empirical equations for the physical and mechanical properties of various rock types. This is because researchers usually base their results on a limited number of test samples and/or lithological units. The research presented here has been primarily performe...
Çok kriterli karar verilmesi (ÇKKV) hem objektif hem de sübjektif değerlendirme içermektedir. Yapılan bu derleme çalışmasında, literatürde çok kriterli karar verme yöntemlerinin kullanıldığı madenciliğin farklı alanlarında yapılmış çalışmalar incelenmiştir. Söz konusu yöntemlerin risk yönetim planlaması sürecinde kullanımından, uygun ekipman seçimi...
Multi-criteria decision making (MCDM) includes both objective and subjective evaluation. Within the scope of this review article, the studies done in different areas of mining where multi-criteria decision making methods are used in the literature have been examined. It has been seen that these methods are used in many different areas of mining suc...
Working conditions in quarries are difficult and dangerous. Severe and dangerous working conditions also bring along occupational accidents and occupational diseases. One of the major risks that may be encountered in terms of occupational health and safety is noise pollution. Noise is an important environmental pollution affecting people's hearing...
Bu çalışmada, Aksaray ilinde faaliyet gösteren altı adet taşocağında kırmataş üretimi esnasında ortaya çıkabilecek tehlikelerin belirlenmesi ve iş sağlığı ve güvenliği (İSG) açısından alınması gereken önlemlerin tespit edilmesi amacıyla proaktif bir yöntem olan ELMERİ® İSG gözlem yöntemi uygulanmıştır. İmalat sektörü için kullanılmakta olan mevcut...
This paper describes how to apply fuzzy inference system (FIS) to estimate the strength of field scale rock masses by judgment and experience of practicing engineers. Three important parameters believed to influence the rock mass behavior namely intact rock strength, block size, and joint surface condition are defined as fuzzy variables. The streng...
This is the presentation slides of the paper in Eurock 2016, held in Cappadocia, Turkey.
One of the most important side effects of bench blasting is the flyrock, which can cause the loss of lives or damage to buildings and equipment. In order to prevent this kind of unwanted situation, it is highly important to predict flyrock occurrences that can be a result of improper blasthole pattern, blasting agent properties, and geologic condit...
This paper introduces a probability-based methodology to evaluate alternative approaches on account of the uncertainties associated with predicting the rock mass properties. The use of this methodology is illustrated through its application for two rock mass case studies. In this regard, the probabilistic spreadsheet models are developed for the es...
This is the presentation slides of the paper at IAEG 2014, held in Torino, Italy.
Backbreak is an undesirable side effect of bench blasting operations in open pit mines. A large
number of parameters affect backbreak, including controllable parameters (such as blast design parameters and explosive characteristics) and uncontrollable parameters (such as rock and discontinuities properties). The complexity of the backbreak phenomen...
Empirical models are being frequently used to estimate rock mass mechanical properties. It is well known that most empirical methods in rock engineering give averaged values, and that it might be significant variation between the lowest and highest value. Besides, it is highly important to describe relations between input parameters in an empirical...
This is the presentation slides for the paper at Eurock 2012, held in Stockholm, Sweden.
Prediction of flyrock distance has a remarkable role in reduction and control of blasting accident in surface mines. In this paper, at first a new empirical equation for predicting flyrock distance was developed using dimensional analysis. The equation extended based on controllable blasting para-meters that compiled from 150 blasting events in Sun...
In this study, a special fitting technique is proposed to apply the Hoek–Brown failure criterion to available laboratory strength data collected on samples of Ankara andesites. The original method of fitting the Hoek–Brown failure criterion using the spreadsheet and the fitting method utilized in the RocLab software are statistically compared with...
Many factors can contribute to rock mass behavior. In this study, the parameters most effective on strength and deformation characteristics of rock masses were determined. For this purpose, Excel models previously developed for Kizilkaya ignimbrites and Ankara andesites were used. Monte Carlo simulation
technique was applied in these models, which...
A very useful approximation for the estimation of the Hoek-Brown material constant m i is presented in this study and the basic logic behind it is evaluated in detail. The study clearly indicates that the Hoek-Brown material constant m i can be approximately predicted from the ratio between the uniaxial compressive strength and tensile strength of...
This is the presentation slides for the paper at Eurock 2010, held in Lausanne, Switzerland.
In the paper, a previously introduced method (Sari, 2009) is applied to the problem of estimating the rock mass properties of Ankara andesites. For this purpose, appropriate closed-form (parametric) distributions are described for intact rock and discontinuity parameters of the Ankara andesites at three distinct weathering grades. Then, these distr...
A practical procedure is described for implementing probabilistic determination of rock mass strength and deformability properties of a pyroclastic rock medium. In order to carry out this procedure, the discontinuity properties of rock mass are collected in the field and laboratory studies are conducted on the intact rock samples. The appropriate st...
In this study, a methodology is proposed towards development of an uncertainty model that includes randomness in the occurrence of days-lost accidents in a coal mine. The accident/injury data consists of 1390 days-lost accident cases recorded at GLI-Tuncbilek underground lignite mine from January 1994 to December 2002. In the first step of proposed...
A new empirical criterion is proposed for the estimation of intact rock failure of Ankara andesites. The necessary data for the analysis is collected from the past laboratory experiments of a rock mechanics course. Brazilian tensile strength, unconfined compressive strength and triaxial compressive strength values at different confining pressures a...
Comparing its safety statistics with other countries one can conveniently assess the condition of a country in terms of occupational health and safety. In this study, it is aimed to evaluate the safety performance of Turkish coal mining industry by comparing its statistics with safety figures of some coal producing countries. The safety numbers of...
Earthmoving (i.e. excavation, loading and transportation of material) makes up a major portion of surface mining operations. Today, there is a wide array of equipment used to perform excavation and loading tasks in open pit mines. However, the performance of these machines is often not fully optimized since the excavated material characteristics ha...
Ihlara valley, which is one of the important natural and historical beauties of our country, covers 240-km2
areas on the central Anatolia region of Aksaray city. It is unique in the world in terms of geomorphology, volcanism, hydrothermal activity, history and culture. In this region, the canyon like valleys have been formed since millions of years...
This is a Technical Note published without an abstract.
Ihlara (Cappadocia) valley, which has been formed from millions of years of geological activities and thousands of years of cultural heritage, is one of the natural and historical beauties of our country. It is unique in the world in terms of geomorphology, volcanism, hydrothermal activity, history and culture. Protecting and preserving the natural...
Coal is the most widely used energy source in Turkey. Although safer modern underground mining methods have been introduced, mine accidents in Turkey still cause loss of lives and money in certain mines. In this study, historical accident records of two underground coal mines of two different panels (conventional and mechanized) are collected and st...
Although modern underground mining methods are introduced, every year mine accidents in Turkey cause a vast amount of economical losses as well as the lives. Risks due to accidents have to be identified, evaluated and controlled or eliminated by proper techniques. In this study, a risk assessment approach will be taken into consideration based on t...
A comparison of safety performance indices in coal mine industry in Turkey and some other major countries will enable authorities to develop strategies in order to take the relevant precautions and eventually improve coal industry in Turkey. This paper presents a comparative study on the basis of accident information for the last decades of Turkish...
Underground coal mine accidents result in many losses which directly reflects to the cost of mining. The randomness in the appearance of the accidents can be determined by frequency that considers how often a specific type of the accident may occur and the severity of the accident in which a financial loss arises resulted from the occurrence of the...
Questions
Questions (3)
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In order to calculate the volume of an in situ block intersected by three joint sets, besides spacings between joints, we also need the intersection angle between joint sets. How can we calculate the intersection angle between joint sets using dip and dip direction data? Can you recommend any methods, software, or papers related to this subject?