Abstract
The creep characteristics of soft clays have been studied for decades. However, the lateral deformation of soils is not allowed during the commonly used one-dimensional consolidation tests, which cannot describe the real deformation features of soils in practice. On the other hand, the influence of drainage distance on the mechanical properties of soil is still controversial, classified as hypothesisAand hypothesisB. For a better understanding of deformation characteristics of soft clay, especially which in long-terms, a series of conventional oedometer tests as well as novel geometric confined consolidation tests was conducted on soft dredger fill. The results show that the secondary consolidation coefficient of the soil sampleCαwould increase firstly, followed by a small decrease with the increase of consolidation pressure generally.Cαwould decrease with the consolidation time and also be reduced by preloading. The strain at the completion of primary consolidation would increase with the drainage distance, but theCαwould be affected little. Both compression indexCcandCαof soft clay would reduce after preconsolidation, in which two parameters show an approximate linear relationship. The creep coefficient of soft clay under the geometric confinementCαε kis larger than that under the oedometer testCαε. However, the trends of the relationship between the creep coefficient and loading are consistent regardless of the confinement conditions.
Highlights
Soft clay could be widely found in nature, which has high water content, low permeability, high compressibility, and high viscosity
A series of oedometer tests and geometric confined consolidation tests were conducted on soft clay samples in eastern Shantou City, China. e deformation characteristics of consolidation, especially in long-term consolidation, were systematically investigated for soft clay
E results could be concluded as follows: (1) Generally, the secondary consolidation coefficient Cα of the soft clay would continuously increase with the load increasing, the increment could reduce gradually
Summary
An Investigation of Time-Dependent Deformation Characteristics of Soft Dredger Fill. For a better understanding of deformation characteristics of soft clay, especially which in longterms, a series of conventional oedometer tests as well as novel geometric confined consolidation tests was conducted on soft dredger fill. E strain at the completion of primary consolidation would increase with the drainage distance, but the Cα would be affected little. Both compression index Cc and Cα of soft clay would reduce after preconsolidation, in which two parameters show an approximate linear relationship. E creep coefficient of soft clay under the geometric confinement Cαkε is larger than that under the oedometer test Cαε. The trends of the relationship between the creep coefficient and loading are consistent regardless of the confinement conditions
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