Geotechnical Properties of Soil from Selected Sites in Dijlah Area Sallah Al-deen Government/Northern Iraq

Abstract

This study aims to find Geotechnical properties for soil in the Dijlah Area, (7) samples weretaken from wells located in the area, according to the size analysis and the plasticity limits testsof that most soils are Silty soil of inorganic low plasticity of the type (ML) and the other sample(CL -ML). The results of chemical analysis showed that the percentage of gypsum rangedbetween (0.30% - 40.65%) and (T.D.S.) ranged between (56.14%-0.90%) that the high ratescause geometric problems on buildings and structures, While the proportion of organic matter(0.30% -0.95%) and pH values between (7.80–7.9), a somewhat acceptable values. The valuesof the moisture content of the soils ranged from (0.5% -3.0%) and the presence of gypsum anda collection of sample in the month of September clear effect on those values and may impactadversely on the Voids ratio and compression index, and cause in reducing the values ofCohesion and Internal Friction angle of the soil, Compression index values shown the highcompressibility of soil, and the values of the Swelling index indication that the Swelling ratiois low. Soil was evaluated according to the values of the study area (O.C.R.) As excessiveconsolidation soil . Results showed that the X-ray diffraction test of non-clay minerals arepredominant (Calcite, quartz, feldspar) and either clay minerals are (Montmorillonite, Illte,Kaolinite and Palygoroskite ( .