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中文摘要：
提出了一种适用于砂土的各向异性破坏准则，该准则能够反映不同砂土各向异性破坏特性，其参数可以根据某些特定应力区的三轴压缩和三轴拉伸试验结果获得，即根据强度比值确定。为了考虑不同应力区内的中主应力对内摩擦角的影响，提出了广义中主应力系数和广义内摩擦角的概念和表达式，并且建立了基于一种各项异性破坏准则的内摩擦角和中主应力系数的统一显示表达式。通过对一些真三轴试验结果预测，结果表明所提出的摩擦表达式能够整体上描述各向异性砂土的中主应力系数对内摩擦角的影响。
英文摘要：
An anisotropic failure criterion is proposed to present anisotropic failure behaviors for different kinds of sand, which can be employed to simulate both isotropic and anisotropic strength behaviors of granular materials. The model parameters can be determined by the strength ratios based on the triaxial compression and extension tests in different stress areas. Concepts and expressions are put forward for the generalized intermediate principal stress parameter and the generalized internal friction angle, respectively. The generalized expression of the internal friction angle influenced by the intermediate principal stress parameter is deduced based on the proposed anisotropic failure criterion. This generalized explicit expression is available for different soil strength criteria to establish the relationship between the internal friction angle and the intermediate principal stress parameter. Comparisons between simulations and test results show that this general expression of the internal friction angle can well reproduce the true triaxial test results of soils in all stress areas.
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