Abstract
In many cases, the soil in Nasseriyah, Iraq, is not suitable to support the shallow foundations of low to medium rise buildings without improvement or replacing the founded layer with a strong layer. Therefore, the reinforcement method as one of many types of improvement methods may be used to increase the bearing capacity and reduce the settlement when the replacement soil is not enough to support the foundation. This paper reviews the most important reinforcement materials such as geogrid that may be used to increase the strength of the soil and other details of the number of layers, the distance between layers and the optimum location of the top reinforced layer for clay and sand soil. Experimental studies and theoretical modelling performed through the last decades are reviewed to choose the best arrangement of geogrid material that gives the best performance when it is used with soil. It is found that the geogrid can be used to increase the bearing capacity, however, the studies on clay reinforced with geogrid compared to sand soil are few. Since the researches on the behavior of foundation resting on clay reinforced with geogrid are few and because the soil in Nasseriyah is mostly clay soil, it is recommended to study the behavior of foundation resting on clay reinforced soil.
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