Mohammed Shaker Mahmood, Laith Aziz and Assad M. B. Al-Garrawi
Abstract
This paper investigates the effect of the soaking process on the settlement behavior of sand soil with gypsum from Al-Najaf city in Iraq. The investigation includes two sets of soil samples with different gypsum contents, about 5 and 11 percentages. These two sample sets are subdivided into three groups and each group is subjected to one of the soaking duration, 0,1 and 2 weeks. In addition, each subdivision group is loaded by three stress levels, 50, 100 and 200 kPa. The results reveal that there are different settlement behaviors that may be related to the initial soil properties. For soil samples of initial high dry density, low water and gypsum contents give a clear trend of settlement increasing upon increasing of soaking time and stress. Otherwise, the samples with initially higher water and gypsum contents contribute a misleading in settlement behavior because of the possible rebuilding of dissolved gypsum in the soil spaces. All specimens are revealed small similar heave values after unloading processes.
Publication Date
11/1/2018
Publisher
International Journal of Civil Engineering and Technology
أ.د. محمد شاكر محمود | Prof. Dr. Mohammed Shakir Mahmood | 12251