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Published in: Neural Computing and Applications 12/2022

03-02-2022 | Original Article

The prediction of dynamic energy behavior of a Brazilian disk containing nonpersistent joints subjected to drop hammer test utilizing heuristic approaches

Authors: Jamshid Shakeri, Mostafa Asadizadeh, Nima Babanouri

Published in: Neural Computing and Applications | Issue 12/2022

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Abstract

Crack development initiated from nonpersistent joints in rock mass plays a key role in the instability of rock structures. In particular, the dynamic behavior of nonpersistent discontinuities can result in the coalescence and failure of rock structures. The effect and contribution of such joint parameters on rock structures’ failure under impact loading have not been thoroughly investigated by researchers. In this paper, 68 concrete Brazilian disks, manufactured to include several nonpersistent joints and joint sets, are subjected to impact loading to explore the impact of joint continuity factor, joint spacing, bridge angle, and loading direction on the required dynamic energy for crack initiation (DECI) and coalescence (DECC). Artificial neural network (ANN), adaptive neuro-fuzzy inference system (ANFIS), and its combination with particle swarm optimization (PSO) and genetic algorithm (GA) have been developed to predict the energy indexes. The performance of the models was evaluated using statistical indicators. The results show that intelligent methods can predict both energy indexes and that their outputs are consistent with laboratory results. The R-squared index for the test data of the ANN, ANFIS, and ANFIS-PSO/GA models to predict DECI parameters is 0.97, 0.96, 0.96, and 0.97, respectively, and for DECC is 0.98, 0.96, 0.96, and 0.93, respectively. The ANN have the best performance for the test data based on all statistical indexes. In addition, multiple parametric sensitivity analysis shows that both the joint continuity and joint spacing have the most significant effect while bridge angle and loading direction have the minimal effect on the energy indexes.

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Metadata
Title
The prediction of dynamic energy behavior of a Brazilian disk containing nonpersistent joints subjected to drop hammer test utilizing heuristic approaches
Authors
Jamshid Shakeri
Mostafa Asadizadeh
Nima Babanouri
Publication date
03-02-2022
Publisher
Springer London
Published in
Neural Computing and Applications / Issue 12/2022
Print ISSN: 0941-0643
Electronic ISSN: 1433-3058
DOI
https://doi.org/10.1007/s00521-022-06964-5

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