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Rock strength estimation: a PSO-based BP approach

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Abstract

Application of back-propagation (BP) artificial neural network (ANN) as an accurate, practical and quick tool in indirect estimation of uniaxial compressive strength (UCS) of rocks has recently been highlighted in the literature. This is mainly due to difficulty in direct determination of UCS in laboratory as preparing the core samples for this test is troublesome and time-consuming. However, ANN technique has some limitations such as getting trapped in local minima. These limitations can be minimized by combining the ANNs with robust optimization algorithms like particle swarm optimization (PSO). This paper gives insight into development of a hybrid PSO–BP predictive model of UCS. For this reason, dataset comprising the results of 228 laboratory tests including dry density, moisture content, P wave velocity, point load index test, slake durability index and UCS was prepared. These tests were conducted on 38 sandstone samples which were taken from two excavation sites in Malaysia. Findings showed that PSO–BP model performs well in predicting UCS. Nevertheless, to compare the prediction performance of the PSO–BP model, the UCS is predicted using ANN-based PSO and BP models. The correlation coefficient, R, values equal to 0.988 and 0.999 for training and testing datasets, respectively, suggest that the PSO–BP model outperforms the other predictive models.

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Authors and Affiliations

  1. Centre of Tropical Geoengineering (GEOTROPIK), Faculty of Civil Engineering, Universiti Teknologi Malaysia (UTM), 81310, Skudai, Johor, Malaysia

    E. Tonnizam Mohamad

  2. Department of Civil and Environmental Engineering, Amirkabir University of Technology, Hafez Ave, 15914, Tehran, Iran

    D. Jahed Armaghani

  3. Faculty of Engineering, Lorestan University, 68151-44316, Khorramabad, Iran

    E. Momeni

  4. Department of Geotechnics and Transportation, Faculty of Civil Engineering, Universiti Teknologi Malaysia (UTM), 81310, Skudai, Johor, Malaysia

    E. Momeni

  5. Kno.e.sis Center, Wright State University, Fairborn, OH, 45435, USA

    A. H. Yazdavar & M. Ebrahimi

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  1. E. Tonnizam Mohamad
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  2. D. Jahed Armaghani
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  4. A. H. Yazdavar
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Correspondence to D. Jahed Armaghani.

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Mohamad, E.T., Armaghani, D.J., Momeni, E. et al. Rock strength estimation: a PSO-based BP approach. Neural Comput & Applic 30, 1635–1646 (2018). https://doi.org/10.1007/s00521-016-2728-3

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  • DOI: https://doi.org/10.1007/s00521-016-2728-3

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