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Öğe A New Approach for Assessing Dimension Quarries Using Rock Block Size Distributions(International Society for Rock Mechanics, 2012) Turanboy, A.; Ülker, E.The size of rock blocks play an important role in mining applications (stability, excavation, etc.) and in-situ block size distribution has been the best way to assess block sizes in rock masses. In addition, the assessing of several size-reducing applications (excavation, blasting) is carried out using interpretations of broken block size distribution. There are several methods that attempt to predict the size of in-situ or broken blocks and their corresponding distributions. The most common kinds are based on direct measurements of free surfaces and piles. These methods have long been used successfully in many mining operations. Due to a lack of proper consideration, economical losses occur during the planning of dimensional stone quarry operation. This study aims to assess the final excavation of useful (marketable) rock blocks in the present dimension quarry and/or the pre-evaluation of potential resources. The size distribution curves have been carried out as assessment tools for this aim. The basis of the developed approach is to compare in-situ, useful and non-useful dimensional blocks. Thus, it has been attempted to create a new economical perspective in dimensional quarry sectors. Sieve curves have been used as principle assessing tools. To show the effect of methods in the study, a field study is implemented and the results of the study are also given in the paper.Öğe A new approach for assessing stability of rock slopes considering centroids of weak zones(SHAHROOD UNIV TECHNOLOGY, 2018) Turanboy, A.; Ulker, E.; Kucuksutcu, C. B.The intersection lines between discontinuity surfaces and their intersection points on the visible surfaces of any engineering structure may be the instability indicators. This paper describes a new approach to modelling the intersecting lines and points that would provide the first evaluation of any instability in an engineering structure characterized by the failure modes. In this work, the intersection lines were grouped according to their direction either in the reverse or in the same direction as the dip of the slope. Furthermore, the intersection lines are grouped according to various ranges of the interior friction angle, which can be selected by the users in a computer application developed for this work. The orientation of the intersecting lines and the location of the exposed intersection points are defined and assigned as the scatter points. These exposed points are clustered to determine the centroid locations. The K-means clustering is used in this step. Finally, all these analyses are integrated in a logical order, and the results obtained are used to assess the instabilities on the slope surface. Experiments are carried out on a rock cut along the Konya-Antalya (Turkey) highway, which is composed of limestone, to demonstrate the performance and results of the approach. The locations of the possible failure zones in the critical range of the interior friction angle are defined both visually and numerically along the slope. Experiments show that the proposed method is very useful and easy to implement and yields practical preliminary evaluation results pertaining to instabilities according to the basic failure modes.Öğe A new stability approach using probabilistic profile along direction of excavation(SHAHROOD UNIV TECHNOLOGY, 2020) Turanboy, A.; Ülker, E.; Küçüksütçü, C. Burak.Estimation of the possible instability that may be encountered in the excavation slope(s) during the planning and application steps of the rock excavation processes is an important issue in geoengineering. In this paper, a modelling method is presented for assessing the probability of wedge failure involving new permanent or temporary slope(s) along the planned excavation direction. The geostructural rock slopes including wedge blocks are determined geometrically in the first step. Here, a structural data analysis system that includes a series of filterings, sortings, and linear equations used to reveal the necessary geometric conditions for the wedge form is developed and used. The second step involves the 3D visualization and Factor of Safety (FS) using the limit equilibrium analysis of wedges on both the actual and planned new excavation surfaces. The last step is the Monte Carlo simulation, which is used in assessing the instabilities on the actual and planned new excavation surfaces. These new slope surfaces that have not yet been excavated are called the virtual structures. As a result of this work, the mean and probabilistic FS variations in the planned excavation direction are obtained as profiles. We suggest the preliminary guidelines for the mean and probability of the wedge failure in the excavation direction. The model is tested on a motorway cut slope. The FS results obtained from the Monte Carlo simulation calculations are compared with the mean results and the changes are revealed with the reasons.Öğe Using the distribution curves to optimize the block exploitation in natural stone quarries(CRC PRESS-TAYLOR & FRANCIS GROUP, 2014) Turanboy, A.; Ulker, E.The geometrical design of optimum cutting is the first task in natural stone quarries. The largest trade blocks (quboits) are the most desired, but they are limited by several geological drawbacks, including one of the most important, discontinuities in rock mass. Rock blocks in mass that formed naturally may range from very small to a few meters with different shapes and orientations. Most trade blocks are chosen and cut from intact rock that bounded discontinuities. Therefore, a discontinuity-based economical analysis should be done in many phases, especially in pre-evaluating deposits and during the cutting operations. There are many modelling methods related to discontinuities. These methods have been used successfully as one of the main tools in many mining and civil engineering applications such as stability, blasting, and fluid flow. Nevertheless, discontinuity-based assessments and economical analyses related to them have not adequately progressed in the natural stone industry. The analyses and assessments in natural stone quarries generally are still done with human perception. Furthermore, it causes the loss of a large amount of natural resources as an inevitable result of low technology. The general aim of this study is to compare the current and optimal conditions of productions in active dimension stone quarries as well as pre-evaluations of natural stone deposits. Therefore, we suggested a new perspective comparing the distribution curves of blocks (polyhedrals and quboits) from in in-situ deposit to the final product. This paper also made several theoretical comments about distribution curves.
