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Experimental study on compressibility of Shanghai soft clays
Pages: 23-29
Year: Issue:  9
Journal: Geotechnical Investigation & Surveying

Keyword:  Soft clayundisturbed sampleremolded samplestructural yield stresscoefficient of secondary consolidation;
Abstract: A large number of one-dimension primary and secondary consolidation tests have been carried out to study the effect of soil structure on compression characteristics on undisturbed and remolded samples obtained from three different soft clays in Shanghai.The primary compression test results show that the compression curves of undisturbed samples are above that of the remolded samples and the structure yield stress is obviously existed in the undisturbed samples.The magnitude of structure yield stress is related with the sampling method.The structural yield stress point is found in the samples taken by in-situ cut while no yield point is observed in the samples taken by thick wall method.Based on the secondary consolidation compression curves of undisturbed and remolded samples,it is found that the secondary consolidation coefficient of undisturbed samples is related with the consolidation pressure due to the soil structure and the consolidation pressure at maximum secondary consolidation coefficient is about 1.5 ~ 2.5times of the structure yield stress for undisturbed samples.While there is no relationship between secondary consolidation coefficient and consolidation pressure for remolded samples.The values of secondary consolidation coefficient in normal consolidation state and the values of Ca/Ccshow that the Shanghai soft clay is inorganic clay and silt with moderate to high secondary compressibility.
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