نوع مقاله : مقاله پژوهشی
1 دانشکده مهندسی معدن، دانشگاه علو م وتحقیقات، تهران، ایران
2 دانشکده مهندسی عمران، آب و محیط زیست، دانشگاه شهید بهشتی، تهران، ایران
3 دانشجوی دکتری، دانشکده مهندسی عمران، دانشگاه آزاد اسلامی اراک، ایران
4 دانشگاه بین المللی امام خمینی (ره)، قزوین، ایران
عنوان مقاله [English]
Wind turbines foundation in addition to vertical loading are subjected to horizontal seismic and wind forces that cause eccentric loading and reduce the soil bearing capacity. For wind turbine, circular foundations are more economical than other forms because it can is not fixed to the reversal of wind and earthquake. In the last three decades, Geosynthetics application is common to increase the ultimate bearing capacity. In this study, the behavior of circular foundation under axial and eccentric loading in two conditions of unreinforced and reinforced with one layer of geogrid reinforcement have been studied experimentally. A surface circular footing 120 mm in diameter (D) was used as shallow foundation. The model tests were carried out in a square Plexi glass tank of size 0.6 × 0.6 × 0.6 m. Dry sandy soil used in tests with relative density of 60%. Parameters considered in this study include the depth of reinforcement layer from the surface (3, 5 and 7 cm) and load eccentricity. It was found that the geogrid reinforcement layer improved the load- settlement response. Bearing capacity ratio (BCR), defined as the ratio of load for a given settlement in geogrid- reinforced case to that for the same settlement in unreinforced case. It was shown that with increasing load eccentricity, when the reinforcement was placed in depth of 5 cm (u/D=0.42), the BCR improves significantly. Results showed that the distance of 5 cm for the one layer of geogrid will result in greatest improvement for the ultimate bearing capacity.