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Öğe An approach for the probability of wedge failure in the excavation direction(CRC Press/Balkema, 2018) Turanboy A.; Ülker E.; Küçüksütçü C.B.This paper aims to show the results of a methodology used in the analysis of rock slopes in terms of wedge failures based on assumed new surfaces in the excavation direction that links a well-developed database structure, visual representations, basic limit equilibrium analysis and statistical analyses. The method presented here is intended to clarify the complexity of the structure of rock slopes that include wedge blocks in the first step of the model. The structural data analyses used here consist of a series of sorting and filtering processes for which the raw data are derived from scan-line surveys in this step. In the second step, visual representations, spatial variability, size distributions. The last step of the developed model includes Monte Carlo simulation (MCs), which is devoted to assessing the instabilities of rock slopes based on actual and planned new excavation surfaces, which are named the Hypothetical Excavation Surfaces (HES) of the rock slopes. The developed model has been tested on a highway slope as a field experiment. The experimental slope has seemed to be unstable during an assumed excavation according to the results of the analyses. © 2018 Taylor & Francis Group, London.Öğe Investigation of possible failure locations: KDE of intersection points on visible rock surfaces(Avestia Publishing, 2016) Turanboy A.; U¨lker E.; Ku¨çu¨ksu¨tcu¨ C.B.One of the most serious problems in rock engineering applications is the accidental falling of rock blocks that are formed by discontinuity in the rock mass and free surface(s) of engineering structure such as open pit slope, tunnel wall etc. For the stability analysis of in rock mass, there are so many parameters. However, the most important of them which should be taken into account, are the geometrical parameters of discontinuity because the discontinuities are mechanically weak zones and failures occurred on thought surfaces and intersection lines of them and geometrical characteristics are also used as decisive factors in different scales in all stability analysis. Investigation of starting point of possible fails must be a crucial step both in pre-design analysis on existing structures. Because the failures are mostly beginning at these points which are investigated as an analytic solution in this paper. Starting possible locations of failures can be investigated as points on free surfaces of an engineering construction. This study includes derived series of linear equations for the investigation of these points. In addition, Kernel Densities Estimation (KDE) of intersection points is described using for the prediction of failure locations on the visible surfaces of an engineering structure. Derived methodology was sampled on an experimental highway wall and consistent results were shown successfully. © Avestia Publishing, 2017.Öğe A modeling study of intersection lines and points as an assessing instability of rock mass(International Society for Rock Mechanics, 2016) Turanboy A.; Ülker E.; Küçüksütcü C.B.Discontinuities play a crucial role in the stability of any engineering structures such as open pit slope, highway wall, etc. Because the discontinuities are mechanically weak zones and failures occurred thought discontinuity surfaces and intersection lines which are bounded rock blocks. Therefore, the characterization of rock mass and the stability analysis based on this evaluation requires a deep understanding of the discontinuity geometry (i.e. Dip and dip direction). In order to assess the global quality of a rock mass, several authors proposed the use of geotechnical classifications for a long time. All of the classifications are including several geometric parameters in several degrees. Intersection lines between discontinuity surfaces and points of them on the visible surfaces of any engineering structure that excavated rock mass may also be indicators of any instability. This paper describes a new approach to modeling of intersecting lines and points as the evaluation of the instabilities of an engineering structure which excavated in rock masses. This study includes a series of derived linear equations to describe the orientation of intersecting lines, the location of exposed intersection points and finally statistical distributions of the obtained results. Kernel Densities Estimation (KDE) was used as a tool for the statistical analysis. This analysis carried out as the contouring intersection points by selecting critical intersection lines according to friction angle of discontinuity surfaces. The model seems to be a practical tool for assessing of rock mass instabilities. To run the model, dip, dip direction and spacing values are adequate. © 2016 Taylor & Francis Group, LondonÖğe A modeling study of intersection lines and points as an assessing instability of rock mass -- 2(CRC Press/Balkema, 2016) Turanboy A.; Ülker E.; Küçüksütcü C.B.Discontinuities play a crucial role in the stability of any engineering structures such as open pit slope, highway wall, etc. Because the discontinuities are mechanically weak zones and failures occurred thought discontinuity surfaces and intersection lines which are bounded rock blocks. Therefore, the characterization of rock mass and the stability analysis based on this evaluation requires a deep understanding of the discontinuity geometry (i.e. Dip and dip direction). In order to assess the global quality of a rock mass, several authors proposed the use of geotechnical classifications for a long time. All of the classifications are including several geometric parameters in several degrees. Intersection lines between discontinuity surfaces and points of them on the visible surfaces of any engineering structure that excavated rock mass may also be indicators of any instability. This paper describes a new approach to modeling of intersecting lines and points as the evaluation of the instabilities of an engineering structure which excavated in rock masses. This study includes a series of derived linear equations to describe the orientation of intersecting lines, the location of exposed intersection points and finally statistical distributions of the obtained results. Kernel Densities Estimation (KDE) was used as a tool for the statistical analysis. This analysis carried out as the contouring intersection points by selecting critical intersection lines according to friction angle of discontinuity surfaces. The model seems to be a practical tool for assessing of rock mass instabilities.To run the model, dip, dip direction and spacing values are adequate. © 2016 Taylor & Francis Group, London.Öğe A new approach to rapid 3D mapping of rock mass structure(2008) Turanboy A.; Ülker E.The prediction of rock mass behavior is an important task in many engineering projects, as the behavior of rock masses can be controlled by the presence of discontinuities. Being able to map the structure of a rock mass is crucial to understanding its potential behavior. This understanding can positively impact the safety and efficiency of an engineering project. In this research, rock masses were mapped and analyzed using linear mathematical transformations and isometric perspective methods to achieve meaningful three-dimensional (3D) results. The rock mass fracture representation is based on explicit mapping of rock faces. The developed model can improve safety and productivity through its application in the determination and analysis of rock mass structure for geological and geotechnical assessment. Based on the methods explained here, a software system was developed for analyzing the geometric characteristics of discontinuities in a rock mass. In this model, discontinuities in a rock mass can be visualized both individually and in combination, and cross-sections can be generated at any desired location. In addition, intersection lines between discontinuities can be generated as dip direction vectors. The natural structure attained by using this developed model agrees well with field measurements.
