"Engineering design has great importance in the cost and safety of engineering structures. Rock mass rating (RMR) system has become a reliable and widespread pre-design system for its ease of use and variety in engineering applications such as tunnels, foundations, and slopes," investigators in Kocaeli, Turkey report.
"In RMR system, six parameters are employed in classifying a rock mass: uniaxial compressive strength of intact rock material (UCS), rock quality designation (RQD), spacing of discontinuities (SD), condition of discontinuities (CD), condition of groundwater (CG), and orientation of discontinuities (OD). The ratings of the first three parameters UCS, RQD, and SD are determined via graphic readings where the last three parameters CD, CG, and OD are estimated by the tables that are composed of interval valued linguistic expressions. Because of these linguistic expresions, the estimated rating values of the last three become fuzzy especially when the related conditions are close to border of any two classes. In such cases, these fuzzy situations could lead up incorrect rock class estimations. In this study, an empirical database based on the linguistic expressions for CD, CG, and OD is developed for training Artificial Neural Network (ANN) classifiers. The results obtained from graphical readings and ANN classifiers are unified in a simulation model (USM). The data obtained from five different tunnels, which were excavated for derivation purpose, are used to evaluate classification results of conventional method and proposed model," wrote E. Mert and colleagues.
The researchers concluded: "Finally, it is noted that more accurate and realistic ratings are reached by means of proposed model."
Mert and colleagues published their study in Neural Computing & Applications (An assessment of total RMR classification system using unified simulation model based on artificial neural networks. Neural Computing & Applications, 2011;20(4):603-610).
For additional information, contact E. Mert, Kocaeli University, Hereke Omer Ismet Uzunyol Vocat School, Hereke Campus, TR-41800 Kocaeli, TURKEY.
The publisher of the journal Neural Computing & Applications can be contacted at: Springer, 233 Spring St., New York, NY 10013, USA.
Keywords: City:Kocaeli, Country:Turkey, Region:Eurasia, Artificial Neural Networks, Emerging Technologies, Engineering, Machine Learning, Neural Computing, Neurocomputing
This article was prepared by Internet Networks & Communications editors from staff and other reports. Copyright 2011, Internet Networks & Communications via VerticalNews.com.
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