The Journal of Science and Engineering Applications (JSEA)

Abstract

This study include the effect of leaching on the engineering properties especially compressibility characteristics; In addition of the gypesous soil containing (35.5 , 27%) gypsum. The engineering properties of these two soils were first studied, which included determining (the index properties and compaction properties of the soil) for both natural and compacted cases; The washing process was also conducted for the natural and compacted soils to study the effect of this process on the engineering properties of this soil, especially the compressibility. The result showed that the increase of gypsum content in the soil result in the increase of the maximum dry density, giving better consolidation properties due to the decrease in the value of the initial void ratio (e0), also the decrease in both of the compression index (Cc) and the coefficient of consolidation (Cv); The results of washing also showed the transformation of the soil after the washing process into a very soft soil with a moisture content higher than the liquidity limit (L.L), such that it is difficult to prepare non-distorted models for the purpose of studying the properties of joining; In addition to an increase in the value of the initial void ratio (e0) after washing the soil. Undisturbed and there was a decrease in this value for compacted (and partially hydrated) soil, and washing led to an increase in the value of the liquidity limit (L.L) and the plasticity limit (P.L) with the increase of the washing period.