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CONSOLIDATION PROPERTIES OF COHESIVE SOILS IN THE RED RIVER DELTA IN SALT-AFFECTED CONDITIONS
Abstract
Saline intrusion related to drought and sea level rise may result in changing of engineering properties of cohesive soils. To comprehend the variation of geotechnical properties of soils intruded by saline water, consolidation is one of the important aspects should be investigated. Undisturbed soil samples that originated from sediment in the Red River delta, Vietnam, were chosen. In the conditions that soils had been fully saturated by solution of four salt concentrations, 0.0, 9.9, 19.8 and 33пїЅ, the variation of geotechnical parameters of the soils were verified. Consolidation of soil specimens change almost proportionally to the concentration of saline water. Namely, coefficient of consolidation decrease proportionally to salinity, meanwhile compressibility index and secondary compression index increase with the same conditions. The change of consolidation properties of the cohesive soils in the Red River delta in saline media is believed to be related to clay mineral composition. The presence of expandable clay mineral together with a series of physico-chemical interactions bringing about neutralizing of negative charge of clay is considered as reason of those changes.
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References10
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