A PHYSICO-CHEMICAL APPROACH TO THE CONSOLIDATION MECHANISM OF SOFT CLAYS

概要

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An experimental attempt was made to distinguish between primary and secondary phases of consolidation of soft clays under incremental and continuous loading. The consolidation mechanism of soft clays under elevated temperature conditions was also investigated. Making use of the differences in the replaceability of exchangeable cations absorbed to the clay particles, a special method of preparation of the clay samples was developed. The time-dependent variations of concentrations of the particular types of cations Ca^<2+> and Na^+ which existed in the pore fluid drained from clay samples during consolidation were obtained from quantitative chemical analyses. The greater increases in the concentrations of divalent cations Ca^<2+> contained in the pore fluid within the micro-pores were observed during both secondary and elevated temperature consolidation. These increases were considered to demonstrate the progressive deformation of micro-pores within the clay microstructures. The volume change of clay under constant rate of strain loading was presumably due to the deformation of the macro-pores. The main cause of "aging effects" from elevated temperature consolidation was shown to be the acceleration of secondary compression of the clay, which would have occurred during long term consolidation under normal temperature conditions.
社団法人地盤工学会の論文
1994-12-15