Abstract
This study aims to find Geotechnical properties for soil in the Dijlah Area, (7) samples were
taken from wells located in the area, according to the size analysis and the plasticity limits tests
of 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 ranged
between (0.30% - 40.65%) and (T.D.S.) ranged between (56.14%-0.90%) that the high rates
cause 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 values
of the moisture content of the soils ranged from (0.5% -3.0%) and the presence of gypsum and
a collection of sample in the month of September clear effect on those values and may impact
adversely on the Voids ratio and compression index, and cause in reducing the values of
Cohesion and Internal Friction angle of the soil, Compression index values shown the high
compressibility of soil, and the values of the Swelling index indication that the Swelling ratio
is low. Soil was evaluated according to the values of the study area (O.C.R.) As excessive
consolidation soil . Results showed that the X-ray diffraction test of non-clay minerals are
predominant (Calcite, quartz, feldspar) and either clay minerals are (Montmorillonite, Illte,
Kaolinite and Palygoroskite ( .
Keywords