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Compression Index versus Natural Water Content Relationships for China's Coastal Soft Clays
Yanbin Gao,Zhongqing Chen,David Airey 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.11
A large number of Cc - wn (Cc is the compression index and wn is the natural water content) correlations have been proposed by researchers for different soft clays around the world, but comparisons of these correlations and reasons for differences between them are rarely reported. In this paper the Cc - wn relationships of marine soft clays from eight China’s coastal cities are presented. It is found that the north coast clays have larger slope of the Cc - wn relationships (about 0.02) than the south coast clays (about 0.008). Comparisons with Cc - wn relationships for remoulded clays and structured natural clays reported by other researchers show the importance of accounting for soil structure, and the higher compressibility and higher apparent preconsolidation stresses of the north coast clays, in comparison to the south coast clays, are believed to be associated with chemical bonding and other post-depositional changes. Most of the reported Cc - wn correlations for natural soft clays from around the world have slopes of about 0.011, which are applicable to weakly structured clays. To develop a more widely applicable Cc - wn correlation, the effects of soil structure need to be incorporated.
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