Load transfer mechanisms and design method of low geosynthetic-reinforced embankments subjected to localized sinkholes

Low geosynthetic-reinforced embankments have a higher bearing capacity. In addition, the horizontal geosynthetics can prevent embankment from collapsing suddenly, which plays a warning role. The design of geosynthetic-reinforced platforms based on the load transfer mechanisms of low embankment in karstic regions should be proposed, for which the existing design methods are not recommended because of the complex mechanisms. By analyzing the stress-strain relations of the platform, the design considering the principal stress rotation due to differential settlements is improved and optimized under the assumption that there is a parabolic overload distribution perpendicular to the sheet overlying the void. The design method for the tensile stiffness of geosynthetic-reinforced sheet and the embankment height based on the load transfer mechanisms of low reinforced embankment spanning the sinkholes is proposed, containing different forms of surface subsidence and can be applied to the serviceability limit state design and the ultimate limit state design simultaneously. The accuracy and rationality of the proposed method are verified by comparisons of the current design methods so as to provide a reference for such structures.