تعيين معامل النفاذية لمواقع في مدينة النجف الأشرف

Abstract

Najaf, the holy city, is located in the middle part of Iraq and represents the seventh governorate from the eighteen governorate of Iraq in area. Permeability in Al-Najaf city is the importance property that effects on the buildings stability, therefore, the research is focused to evaluate the permeability for coarse Al- Najaf soil (cohesionless soil). Due to the soil morphology of Al-Najaf city, many disturbed samples at different depths were brought representing locations covering the region in Al-Najaf governorate. Four locations of soils in Al-Najaf city are selected. These locations are classified according to the values of effective diameter to (A, B, C and D). The coefficient of permeability (k) is estimated by using the constant head permeability test when the soil samples are prepared in dry state, then spreading the soil inside the permeability container at different density by using raining soil (at different void ratio), these tests are repeated at different coefficient of uniformity (CU).The mathematical representation of the coefficient of permeability data are represented by empirical equation. The regression analysis was performed by using the statistical package and the results of the analysis provide the empirical equation for Al-Najaf soil . The empirical equation(12) compare with the Poiseuille's equation(11),the results of the empirical equation are conservative as compared to Poiseuille's equation. The results obtained from the present empirical equation (12) are compared with the field results of the four arbitrary locations which show a fairly good matching.