## 1 Introduction
[PERSON] and [PERSON] [20] investigated the uplift behavior of anchor plates in cohesive and cohesionless soils reinforced with geogrid and unreinforced cases by performing small-scale model experiments. According to the results, they stated that the uplift capacity can be increased by using geosynthetics in both cohesive and cohesionless soils. In the study performed by [PERSON] and [PERSON] [21], the effect of soil reinforcement on the uplift capacity of model-belled piles and piers with various geometries embedded in the sand was investigated. According to the results, the uplift response increases with geogrid cell diameter, sand density, pile bell diameter, and embedment depth. [PERSON] et al. [22; 23] reported experimental and numerical analysis results of the uplift capacity of anchor plates with and without geogrid and grid-fixed reinforcement. At the end of the study, it was shown that using reinforcements significantly improved the uplift capacity. [PERSON] [24] carried out experimental and numerical studies on the uplift capacity of square anchor plates. In the tests, geogrids were used to reinforce the sand. The parameters investigated the effects of the depth of the geogrid, the distance between the geogrids, the reinforcement length, the burial depth, and the sand density. According to the results obtained, the uplift capacity of square plate anchors in sand can be significantly increased with geogrid reinforcement. In addition, it was stated that the burial depth and the relative density of the sand are parameters that greatly affect the uplift capacity. [PERSON] et al. [25] investigated the uplift performance of horizontal anchor plates in geocell-reinforced sand soils with model tests. In unreinforced conditions, it has been observed that failure occurs at displacement of 3% of the anchor plate width. Additionally, in the case of using geocell and geotextile layer, the uplift capacity increased approximately 4.5 times. The optimum geocell length was found to be 5.4 times the anchor width. When the literature is evaluated, it is seen that the experimental studies on the behavior of foundations subjected to uplift force generally cover small-scale laboratory experiments, and the number of studies using geogrid reinforcement is quite small. The fact that the uplift capacities of geogrid reinforced anchors have not been investigated by centrifuge tests stands out as an important shortcoming. The most important difference of this study from the studies in the literature is that the uplift capacity of anchor plates in reinforced soil is investigated by centrifuge tests. In the study, the effect of sand density on uplift capacity was investigated in both unreinforced and reinforced conditions. The experiments were carried out at two different burial depths and the optimum reinforcement arrangement was investigated by placing the geogrid in different geometric conditions in the tests. Finite element analyses were carried out using the prototype model of the experimental setup and the analysis results were compared with the experimental results. The findings obtained from the study showed that the burial depth and sand density significantly affect the uplift capacity, the uplift capacity of the anchor plate can be increased by using geogrid reinforcement, and the uplift capacity can be increased by placing the geogrid reinforcement into the soil at different angles. The structural framework of this article is as follows. Section 2 introduces the centrifuge experimental setup and presents the experimental program and the results of the experiments with and without reinforcement. Section 3 describes the results of the finite element analysis performed using the prototype model. Comparison and discussion of the experimental and numerical results obtained are presented in Section 4. Section 5 draws the conclusions.