Fabric anisotropy is a key component to understand the behaviour of granular soils. In general, experimental data on fabric anisotropy for real granular soils are very limited, especially in the critical state. In this paper, x-ray tomography measurements are used to provide experimental data on contact fabric anisotropy inside shear bands for two granular soils. The data are then used to assess the validity of Anisotropic Critical State Theory (ACST) and the accuracy of a fabric evolution law that was previously developed from the results of DEM simulations on idealised materials. Overall, the experimental results support ACST according to which unique (i.e., independent of initial conditions) values for fabric anisotropy and coordination number are observed at large strains. With increasing roundness of the material, the rate at which the critical state is approached increases. The evolution of fabric anisotropy measured from the experiments is fairly well reproduced by the proposed evolution law.

织物各向异性是了解粒状土壤行为的关键因素。通常，关于真实颗粒土壤的织物各向异性的实验数据非常有限，尤其是在临界状态下。在本文中，X射线断层摄影测量用于提供两种颗粒状土壤在剪切带内的接触织物各向异性的实验数据。然后将数据用于评估各向异性临界状态理论（ACST）的有效性以及先前根据理想材料的DEM模拟结果开发的织物演化定律的准确性。总体而言，实验结果，根据该唯一的（ACST支持我。Ë，与初始条件无关）在大应变下观察到织物各向异性和配位数的值。随着材料的圆度增加，接近临界状态的速率增加。从实验中测得的织物各向异性的演化被提出的演化定律很好地再现了。