Spatial variability characteristics of the effective friction angle of Crag deposits and its effects on slope stability



Agbaje, Samzu, Zhang, Xue ORCID: 0000-0002-0892-3665, Ward, Darren, Dhimitri, Luisa and Patelli, Edoardo ORCID: 0000-0002-5007-7247
(2022) Spatial variability characteristics of the effective friction angle of Crag deposits and its effects on slope stability. Computers and Geotechnics, 141. p. 104532.

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Abstract

This study investigated the spatial variability characteristics of the effective friction angle of Crag deposits which are granular soils occur in the east of England. Cone Penetration Test data were obtained at 26 locations and interpreted statistically. The distribution characteristic of the effective friction angle of Crag deposits was derived with the mean value, the standard deviation and the correlation length calibrated. Illustrations were also shown on how factors such as ground water pressures and the existence of soft/organic soil zones affect the measurement of the autocovariance function and thus the correlation length. Bayesian inference technique was adopted alongside the method of moments to determine the correlation length. Based on the obtained statistical parameters, both semi-deterministic (based on standard geotechnical design codes) and probabilistic finite element limit analyses were carried out to investigate the stability of slopes in Crag deposits. Slopes of various inclined angles were considered and comparisons between the semi-deterministic and probabilistic results were conducted to improve the understanding of the stability of Crag slopes and to provide insight into the slope stability code used in practice.

Item Type: Article
Uncontrolled Keywords: Spatial variability, Crag deposit, Slope stability, Finite element limit analysis, Correlation length
Divisions: Faculty of Science and Engineering > School of Engineering
Depositing User: Symplectic Admin
Date Deposited: 06 Dec 2021 08:15
Last Modified: 18 Jan 2023 21:23
DOI: 10.1016/j.compgeo.2021.104532
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3144510