Experimental Testing and Mathematical Modeling of Grout Treated Kirkuk Soft Clay Soil

Abstract

In this study, the untreated and treated grout soft clay soil behaviors have been investigated using both consolidation and unconfined compression stress laboratory tests. Soft soil samples have been obtained from the central zone of Kirkuk city, where this soil has been treated with different schemes of cement grout and cured for two weeks. The used grout has water to the cement of 5 where this ratio has been determined after several laboratory trials. Two nonlinear mathematical models, including second-order polynomial and p-q models, have been utilized to predict the void ratio-vertical effective stress and unconfined compression stress relationships. As the soft soil was treated with five grouts, the void ratio has decreased by 30.6%, and the unconfined compressive strength has increased by 97%. In addition, both used models have good agreements with the experimental data where the maximum recorded R2 for nonlinear polynomial and p-q models were 0.9991 and 0.973, respectively.