Effect of Drainage States on Consolidation of Cohesive Soil Within Plasticity Range

Abstract

The behavior of soil consolidation on cohesive soil through the plasticity range was studied on cohesive soil taken from Tanta in Egypt. Index properties soil testes were carried out in soil laboratory at Al-Azhar University to determine the (liquid limitplastic limit-specific gravity) this soil was divided into five samples with different water content between liquid and plastic limit ,so that the water content of the samples (22%-31%-39%-47%-55%).Then three cases of the odometer test were done (single drainage-double drainage-triple drainage),and each case was performed five times on five sample . From the results of the tests, relationships were drawn between the consolidation coefficients and different stresses at different drainage. The relationships showed that ,the time of consolidation for triple drainage decreased than double drainage by about 26% , at water content 39%to 55% the coefficient of volume change in three dimension drainage is identical at stress 4kg/cm2 and The average values of the coefficient of volume change (mv) for three dimensions are more than one dimension and two dimension drainage about 22.5% and 13.6% under the same applied stress.