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    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.
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    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.