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Bearing capacity of foundations always has been considered as one of main subjects by geotechnical researchers. Applying heavy loads on shallow foundations built with low distance, cause interference phenomenon in behavior of foundations, that its main effects is varying in bearing capacity of foundation. Soil reinforcing with geosynthetic reinforcements such as geogrid and geotextile is a new method which is used in various projects. According to additive usage of geosynthetics as tensile element in soil reinforcing, it is needed that problems of reinforced soil be studied to enlighten its different aspects. In this study, bearing capacity of multiple strip shallow foundations over geogrid-reinforced sand has been investigated. Numerical models have been analyzed and model accuracy has been controlled by comparing experimental results. Results showed that bearing capacity of multiple shallow foundations increases using geosynthetic layers.