Assessment of the Geotechnical Properties of the Third Baiji gas Power Station Site Soil, Strategic Line Route and the Effect of Groundwater Level Fluctuation: A Case Study in Northern Salah al-Din Governorate, Iraq
Abstract
The research aims to evaluate the geotechnical properties of the Quaternary deposits, for the establishment of some engineering facilities in addition to studying the effect of groundwater level fluctuation and predicting the possible subsidence resulting from groundwater withdrawal and impact of this oscillation on the engineering properties of the soil in the Baiji / North Salah al-Din Governorate for the site of Baiji gas power station power station and the path of the strategic line, and the soil moisture changes, the moisture content ratios of the samples ranged between (4.41-5.84%) Specific gravity values ranged between) 2.65-2.69) and from the results of the Grain size analysis of soil, the percentage of clay and silt was found to be the highest, and based on the plasticity chart, it was found that the type of soil CL- ML, ML, the direct shear test showed that the angle of internal friction ranged between (21-22) cohesion strength between (39-49 kPa) and the results of the Consolidation Test showed that the soil is over Consolidation O.C.R. From the results of chemical analyses gypsum content was a high percentage, neutral alkaline soil with a high organic content and a high percentage of sulfates, chlorides, and bicarbonates, and the percentage of dissolved salts exceeds (0.5%), which is considered high, The depths to the groundwater of 11 wells were measured and distributed over the study area and samples were taken from them Chemical analyses, and the results of these analyses showed that the classification of water according to the value of (pH) neutral alkalinity and Brakish Water type, and according to the classification of water depending on the values of the total hardness, it was found that it is of the Very Hard type, as well as the stresses were calculated. Total, neutral, and effective for calculating the possible ground subsidence resulting from groundwater withdrawal, the percentage of subsidence of the soil ranged between (0.200 - 0.275 cm), and the above properties indicate engineering problems in the soil of the study area so they must be addressed before the establishment of any engineering facility.
