Abstract
In recent years, a number of studies had been performed to investigate the effect of pore water chemistry on the strength and compressibility characteristics of soil. Although the effect of chloride and sulfates salts separately in pore fluids on the geotechnical properties of soil seems to be well understood, but the influence of combined effect of sulfates and chlorides in pore water on the behavior of soil is still unclear mostly due to the limited numbers of studies as well as the complexity of processes that may occur in soil (with the presence of salts) in pore water-soil interaction. Southern regions of Iraq, especially Basra suffers from low water levels in the summer season in addition to the lack of rain water, which causes a significant increase of salt in the Shatt al Arab. Water salinity continues to increase with time. To investigate the combined impacts of water salinity on the behavior of clayey soils, the basic characteristics of the soil brought from Al-Nahrawan site was studied. Chemical methods were done with three types of water (distilled, water of highly saline as Shatt Al-Arab water and water of Tarmiya as moderate saline water). The effect of water salinity on the geotechnical properties of fine grain soil was investigated. Different laboratory tests such as Atterberg limits, standard compaction, consolidation and shear strength of soil .Results showed that the presence of perceptible amounts of dissolved salts in water can lead to changes in the engineering properties of the soil.
Highlights
Soil is a mixture of several compounds such as soil solid, air voids and pore water
The term ‘salinity’ represents the soluble salts total concentration in the soil. Those salinity salts come in different forms including calcium, magnesium, chlorides, sulphates or even carbonates of sodium, Pore water salinity influence on the behavior of solid soil particles as a result to the chemical interaction that may occur between the soil particles and the ions in the pore water
Et al,(2008) [2] examined the sea water effects on consistency limits and compressibility properties of clayey soils of low and high plasticity.The results revealed that sea water impacts were almost negligible on the tested consistency limitsand compressibility characteristics of soils when they have liquid limits up to 110%
Summary
Soil is a mixture of several compounds such as soil solid, air voids and pore water. Water is well known to be strongly attracted to the soil surface. The term ‘salinity’ represents the soluble salts total concentration in the soil Those salinity salts come in different forms including calcium , magnesium , chlorides, sulphates or even carbonates of sodium, Pore water salinity influence on the behavior of solid soil particles as a result to the chemical interaction that may occur between the soil particles and the ions in the pore water. This is clearly observed in fine-grained soils. The current study looks into the relationships bonding between salt content that fills the gap and the geotechnical properties of fine-grained soils
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