Abstract
Intrinsic soil properties, such as the Atterberg limits, are essential factors influencing the mechanical behaviour of the fine-grained soils. In this study, a series of long-term multiple-stage loading oedometer tests were performed on alluvial organic soils to investigate the creep behaviour. The plasticity ratios ranged from 0.4 to 0.63. The smaller value of the plasticity ratio Rp indicated higher soil plasticity. The results showed that the coefficient of secondary compression Cαe of alluvial organic soils was stress- and strain-rate-dependent. The coefficient of secondary compression change index m was derived using a double-logarithmic approach for a creep degradation and was related to the plasticity and clay percentage to fines. Based on the results, it was found that high plasticity soils exhibit slow creep degradation rate during one-dimensional straining under normally consolidated state. The results show that the higher soil plasticity expressed by the plasticity index, plasticity ratio and clay percentage to fines, smaller the coefficient of secondary compression change index. Moreover, the correlations among a soil plasticity properties and creep parameters for the alluvial soils have also been proposed.
Highlights
Intrinsic soil properties, such as the Atterberg limits, are essential factors influencing the mechanical behaviour of the finegrained soils
Application of the given formulation (Eq 2) implies: (i) a decreasing Cae over time for an applied stress level as the void ratio decreases during creep, (ii) the repeated decreases in Cae with applied stresses as the void ratio is consecutively lowered during loading, (iii) a positive void ratio at the end of the creep phase resulting from compression
Particular emphasis was given to the aspects of compression behaviour, time dependency and correlations between the creep parameters and the plasticity of the soil
Summary
2.1 Test materials occurrence) and alluvial sands (denoted as C) were identified. The aggradate organic muds are yellow and grey, to black or grey, to brown and composed of admixtures and interlayers of fine sand, silty sand, loamy sand, silty clay and gyttja. The alluvial soils of the Z_ uławy Fens are characterized by very high variability in organic content and water content. This variability translates into different physical and mechanical properties [13, 59]. As a formation, the mud (called ‘‘dy’’) occupies an intermediate place between peat and gyttja. It differs from peat in its high degree of plant mass humification, in which there is no macroscopically recognizable plant debris. In the model weak mineral-organic soils such as aggradate organic muds with medium compact fine-grained sands (denoted as A1 or A2 due to the depth of occurrence), weak mineral soils such as a fine-grained sands with an admixture of decayed plant debris with silt and silty clay
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