Abstract
This paper presents the results of a laboratory study on the stress-strain relationship of solidified clay formed in seawater corrosion condition. An automatic triaxial apparatus was used and the axial stress and strain was monitored continuously. The dry density was 1.0g/cm3, the cement contents were 4, 6, 8 and 10% by weight of dry soil particles, and the curing time was 28, 60 and 90 days respectively. Test results indicate that the stress strain relationship of cemented clay was affected by soil density, cement content and curing period. A behaviour of strain hardening to strain softening occurred with the increase of cement content. Strong structure will form in cemented clay when the admixture content is 10% or more. The increase in strength of the solidified foundation is resulted from the increase in internal friction angle and cohesive force. The cohesive force increases obviously with the increase of the cement content and the curing age, but the change of internal friction angle is not pronounced after reaching a certain value.
Highlights
This paper presents the results of a laboratory study on the stress-strain relationship of solidified clay formed in seawater corrosion condition
The objective of this study is to present the strength characteristics and its changing role of cemented clay formed in environment subjected to ocean erosion, the stress-strain relationship of cement clay with different cement content and curing period
The drained shear test results show out that the deviatoric stress increases with axial strain under marine environment when the cement content is less than or equal to 8%, which is similar to the strength and deformation behaviour of normally consolidated clay
Summary
The clay used in this study was collected from the Xuwei Harbor, which is located on the west coast of Haizhou Bay, the Yellow Sea, China. The site consists of about 12 m of soft clay overlying a deep silty sand layer which is underlain by sand. The soft clay below the sea floor is Holocene marine sediments, which are often distinguished by their high compressibility and high sensitivity. To avoid impurities in the surface layer, the clay used in this study was collected from 2 m below the sea bed.
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