Evaluation of the accuracy of commonly used empirical correlations in predicting the compression index of Iraqi fine-gra
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TECHNICAL PAPER
Evaluation of the accuracy of commonly used empirical correlations in predicting the compression index of Iraqi fine‑grained soils Iyad Alkroosh1 · Saif Alzabeebee2 · Abbas J. Al‑Taie3 Received: 12 April 2020 / Accepted: 13 June 2020 © Springer Nature Switzerland AG 2020
Abstract Several empirical correlations were proposed in the literature to predict the compression index of fine-grained soils using either of the soil properties such as the liquid limit, plasticity index, initial void ratio and natural moisture content. However, the accuracy of these correlations to predict the compression index of Iraqi fine-grained soils has not been investigated before. Hence, this research has been carried out to evaluate the effectiveness of the available correlations in predicting the compression index of fine-grained soils collected from different regions in Iraq. A methodology, based on statistical analysis, has been employed to analyse the differences between predicted and measured compression index values. In addition, a database of properties of fine-grained soils has been collected from the literature to enable the statistical assessment. The results showed a significant scatter in the prediction among the examined correlations, where most of the correlations performed poorly in the predictions. However, it has been shown that the correlations proposed by Rendon-Herrero (J Geotech Eng 109(5):755–761, 1983) and Al-Khafaji and Andersland (J Geotech Eng 118(1):148–153, 1992) provided a good estimate of the compression index compared with other empirical correlations. Keywords Compression index · Iraqi fine-grained soils · Statistical analysis · Consolidation · Empirical correlation
Introduction The geotechnical literature comprises many empirical correlations that have been proposed to estimate soil parameters (e.g. shear strength parameters, compressibility parameters and physical properties). The use of such expressions is considered when the required soil parameters cannot be obtained using routine soil laboratory experiments due to * Saif Alzabeebee [email protected]; [email protected] Iyad Alkroosh [email protected]
Abbas J. Al‑Taie abbas.al‑[email protected]; [email protected]
1
Department of Civil Engineering, College of Engineering, University of Al-Qadisiyah, Al Diwaniyah, Al‑Qadisiyah, Iraq
2
Department of Roads and Transport Engineering, College of Engineering, University of Al-Qadisiyah, Al Diwaniyah, Al‑Qadisiyah, Iraq
3
Department of Civil Engineering, College of Engineering, Al-Nahrain University, Baghdad, Iraq
the difficulties associated with obtaining good quality undisturbed samples, the limitations of the cost of the project and the lack of trained technical staff who can conduct the experiments [44]. In addition, evidences from the literature illustrated that empirical correlations, sometimes, provide satisfactory estimate of soil properties without the need to conduct time consuming and expensive experiments [27]. Consolidati
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