The stress-strain behaviour of geotextile-wrapped soils is a matter of great concern in geotechnical engineering practices. In this study, a unified stress-strain model for geotextile-wrapped soils is proposed and is applied to understand the strength and deformation characteristics of soilbags (woven bag-wrapped soils) in 2D biaxial loading. It is demonstrated that the strength of wrapped soils is greatly improved due to the wrapping effect, and the shearing contraction of the wrapped soils is more pronounced than that of the pure soils. The validity of the results is verified through numerical simulation using the discrete element method (DEM). The effect of the geometric size and material properties of the woven bag on the strength and deformation characteristics of the soilbags is also analyzed using the proposed model. The proposed model differs from existing phenomenological models in that it is able to predict the mechanical response of soilbags when the constitutive behaviours of the wrapped soils and the woven bag are given.

土工布包裹土的应力应变行为是岩土工程实践中非常关注的问题。在这项研究中，提出了一个统一的土工布包裹土的应力-应变模型，并用于了解二维双轴荷载下土袋（编织袋包裹土）的强度和变形特性。结果表明，由于包裹效应，包裹土的强度得到了极大的提高，包裹土的剪切收缩比纯土的剪切收缩更为明显。通过使用离散元方法（DEM）进行数值模拟，验证了结果的有效性。所提出的模型还分析了编织袋的几何尺寸和材料特性对土袋强度和变形特性的影响。