Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Open Access Guideline
Open Access Guideline
Postgraduate Thesis Guideline
Postgraduate Thesis Guideline
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
Estimation of RQD by digital image analysis using a shadow-based method
Date
2018-12-01
Author
Saricam, T.
Öztürk, Hasan
Metadata
Show full item record
This work is licensed under a
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
.
Item Usage Stats
174
views
0
downloads
Cite This
We propose a method for segmentation of cores and estimation of RQD from digital images of rows of core in core boxes in order to compute RQD in an automatic way by finding and locating natural fractures in cores and measuring intact core lengths. First, three digital true color images of a core box, with the same camera position but different light source positions, are taken using a high resolution camera. After detection of the core box with color thresholding, the sections of the box are detected by using Hough transform and boundary tracing algorithms. Then, the cores are extracted from each section using color thresholding. After cleaning shadows created by different light sources using various techniques, non-cylindrical parts of the cores are detected. Finally, RQD is calculated by measuring the valid centerline lengths of each core. All coding routines are written in MATLAB. Twenty different core boxes with 4 and 5 rows storing HQ and NQ diameter cores having various joint/bedding plane angles are photographed several times with different core placements. It is shown that the method is capable of separating even tightly fit joint surface cores. Moreover, it can successfully detect non-cylindrical parts of the cores, and avoid small or irregularly shaped ones which should not be included in RQD calculation. According to the comparison of the manual measurements of the twenty core boxes used to conduct this study, the algorithm is able to compute RQD within an average error rate of 4.8% in 90 to 200 s, depending on the processing power.
Subject Keywords
Geotechnical Engineering and Engineering Geology
URI
https://hdl.handle.net/11511/38023
Journal
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
DOI
https://doi.org/10.1016/j.ijrmms.2018.10.032
Collections
Department of Mining Engineering, Article
Suggestions
OpenMETU
Core
Design implications of analytical and laboratory studies of permanent abandonment plugs
Akgün, Haluk (Canadian Science Publishing, 1999-02-01)
We analyze analytically and numerically the stress distribution along the plug-rock interface and within an axially loaded plug emplaced in a borehole in rock. Experiments show that the interface strength increases with decreasing plug radius and with increasing plug length. Axial strength decreases as a power law of plug radius. An increase in the modulus ratio (ratio of plug modulus to rock modulus) increases the interface strength, until it levels off at a ratio of about 5.0. For short plugs, the tensile...
Discrete Sizing of Steel Frames Using Adaptive Dimensional Search Algorithm
Hasançebi, Oğuzhan (Periodica Polytechnica Budapest University of Technology and Economics, 2019-01-01)
Adaptive dimensional search (ADS) algorithm is a recently proposed metaheuristic optimization technique for discrete structural optimization problems. In this study, discrete sizing optimization problem of steel frames is tackled using the ADS algorithm. An important feature of the algorithm is that it does not use any metaphor as an underlying principle for its implementation. Instead, the algorithm employs an efficient performance-oriented methodology at each iteration for convergence to the optimum or a ...
Database development for diamond core drilling bit selection using field
Güzeloğlu, Levent; Kök, Mustafa Verşan; Department of Petroleum and Natural Gas Engineering (2005)
Drilling bit optimization is one the key concepts in drilling engineering.It is considered as one f the economical factors in an overall well budget.Computers are strictly used as decision-making systems in the optimization calculations.Formation parameters are easily processed according to drilling bit selection criteria by the help of computer programs.Although computer program is an interface by which user makes computer some jobs,database is another important part of this necessary decision-making syste...
Empirical ground-motion models for point- and extended-source crustal earthquake scenarios in Europe and the Middle East
Akkar, S.; Sandikkaya, M. A.; Bommer, J. J. (Springer Science and Business Media LLC, 2014-02-01)
This article presents the latest generation of ground-motion models for the prediction of elastic response (pseudo-) spectral accelerations, as well as peak ground acceleration and velocity, derived using pan-European databases. The models present a number of novelties with respect to previous generations of models (Ambraseys et al. in Earthq Eng Struct Dyn 25:371-400, 1996, Bull Earthq Eng 3:1-53, 2005; Bommer et al. in Bull Earthq Eng 1:171-203, 2003; Akkar and Bommer in Seismol Res Lett 81:195-206, 2010)...
Integrated nonlinear regression analysis of tracer and well test data
Akın, Serhat (Elsevier BV, 2003-08-01)
One frequent observation from conventional pressure transient test analysis is that field data match mathematical models derived for homogeneous systems. This observation suggests that pressure data as presently interpreted may not contain details concerning certain reservoir heterogeneities. On the other hand, tracer tests may be more sensitive to heterogeneous elements present in the reservoir because of the convective nature of the flow test. In this study, a possible improvement of conventional pressure...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
T. Saricam and H. Öztürk, “Estimation of RQD by digital image analysis using a shadow-based method,”
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
, pp. 253–265, 2018, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/38023.