Statistical Evaluation of Geotechnical Correlations

Abstract

Geotechnical correlations are widely used because it can provide fast and cost-effective means of parameter estimation using simple tests. Most of the current correlations were derived from data fitting of measurements for specific site conditions and need to be evaluated before used in other sites. During the correlation development, the deviation of the correlation from the measured values was evaluated using simple statistical measures. A better method of correlation evaluation may reduce the overall deviation of the geotechnical parameter. Amended Theil Inequality Coefficient (ATIC) is proposed as an evaluation tool because it has the advantage that it considers both position and trend conformities between observed and correlated values. To address the efficiency and rationality of ATIC, evaluation of, 92 compression index correlations by ATIC and different statistical measures was carried out. Comparison between the results showed that ATIC is efficient in assessing the best and worst correlations and it can be considered a good tool for correlations evaluation.

The Comparison of the Soft Clay Settlement Under an Embankment Load Using Field Instrumentation and Empirical Formulation

“…This study has examined more than 130 undisturbed specimens obtained from different depths which are results of two years geotechnical studies located at south-west of Iran. Habibbeygi and Nikraz [15] obtained a new CC formula for remolded clay, namely Cc = 0,666eL -0,830e p ; Daoud, Kasama, Saleh, Negm [16] declared the best correlation for Cc is 0,2608e and Cc = 0,0093Wc, and Sari and Firmansyah [17] also obtained a new Cc formula, namely Cc = 0.6787eo-0.1933 obtained from 466 soil samples from 77 points of data bore holes at 25 locations spread in Surabaya area. Those empirical formulations were not used in this study because the data used is only valid for the local area.…”