Abstract:In order to promote the geosynthetics selection application of the ground treatment in the transmission line engineering, strengthen the uplift resistant performance of the aeolian sand composite ground, the laboratory model tests on uplift performance of the composite foundations reinforced with the steel-plastic geogrid, plastic two-way geogrid and geotextile were carried out. Combining the surface crack distribution characteristics during the in-situ uplift loading tests of the conventional aeolian sand foundation and the reinforced composite foundation under uplift failure, the reinforcement mechanism of improving the uplift resistance of aeolian sand ground with geotextile materials was studied. And the effects of tensile strength, elongation and friction coefficient of geosynthetics on the improvement of uplift resistance of aeolian sand foundation was analyzed. The results show that the geosynthetics in composite ground is beneficial to transfer and spread the foundation loading to a wider range, and the uplift performance of foundation is improved by the pull down effect of reinforced materials on the foundation slab, and the tensile strength of the geosynthetics has little influence on the improvement of the foundation uplift ability, and the larger elongation ratio can weaken the uplift reinforcement effect of the composite ground, and the greater the friction coefficient between the reinforced materials and aeolian sand is, the better the uplift reinforcement effect will be. Therefore, the elongation and friction coefficient should be taken into account in the selection of reinforcement materials for aeolian sand ground. And the reinforcement effect of the steel-plastic geogrid and the plastic two-way geogrid is better than the geotextile.