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Accuracy of determining pre-consolidation pressure from laboratory tests
Shear strength and compressibility of fine-grained soils is strongly influenced by their stress history and the maximum (pre-consolidation) pressure ( σ p ′ ). Accurate determination of σ p ′ is thus critical for settlement and stability analysis involving fine-grained soils. Many graphical techniques are available for estimating σ p ′ from the interpretation of soil compression in laboratory consolidation (oedometer) tests. However, the accuracy of these methods has not been extensively proven or compared with each other. A series of 30 laboratory oedometer tests is carried out in this study based on controlled rate of strain and incrementally loaded testing techniques. Several Canadian clay specimens are subject to cycles of one-dimensional compression loading and unloading to produce a known stress history and σ p ′ . The imposed σ p ′ values are compared with the predictions of 11 methods for determining σ p ′ . The accuracies of these methods are subsequently evaluated by comparing their predictions with σ p ′ imposed during the consolidation experiments. While these methods mostly overestimate σ p ′ , it is determined that a bilogarithmic graphical approach based on the slopes of the virgin compression and recompression segments of a soil compression curve provides the most accurate predictions of σ p ′ . The potential ranges of errors associated with the application of each method are also presented.
Accuracy of determining pre-consolidation pressure from laboratory tests
Shear strength and compressibility of fine-grained soils is strongly influenced by their stress history and the maximum (pre-consolidation) pressure ( σ p ′ ). Accurate determination of σ p ′ is thus critical for settlement and stability analysis involving fine-grained soils. Many graphical techniques are available for estimating σ p ′ from the interpretation of soil compression in laboratory consolidation (oedometer) tests. However, the accuracy of these methods has not been extensively proven or compared with each other. A series of 30 laboratory oedometer tests is carried out in this study based on controlled rate of strain and incrementally loaded testing techniques. Several Canadian clay specimens are subject to cycles of one-dimensional compression loading and unloading to produce a known stress history and σ p ′ . The imposed σ p ′ values are compared with the predictions of 11 methods for determining σ p ′ . The accuracies of these methods are subsequently evaluated by comparing their predictions with σ p ′ imposed during the consolidation experiments. While these methods mostly overestimate σ p ′ , it is determined that a bilogarithmic graphical approach based on the slopes of the virgin compression and recompression segments of a soil compression curve provides the most accurate predictions of σ p ′ . The potential ranges of errors associated with the application of each method are also presented.
Accuracy of determining pre-consolidation pressure from laboratory tests
Umar, Muhammad (author) / Sadrekarimi, Abouzar
2017
Article (Journal)
English
Accuracy of determining pre-consolidation pressure from laboratory tests
| British Library Online Contents | 2017
Discussion of ``Accuracy of determining pre-consolidation pressure from laboratory tests''
| British Library Online Contents | 2017
| British Library Online Contents | 2017
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