中文摘要：

讨论了用于触探试验分析的粒状材料本构模型。利用二维离散元程序，对粒状材料触探试验进行数值模拟，研究了地基中的应力路径与应力场，然后基于土力学中的最新知识，分析总结出试验中粒状材料的主要力学特点。研究表明，在粒状材料的触探试验分析中，其本构模型应当包含4个主要特性：剪胀性、率相关性、颗粒破碎和非共轴性。

英文摘要：

The main features of future constitutive models for granular materials in penetration analysis were discussed. A two-dimensional discrete element method （DEM） was used to numerically simulate penetration tests on a granular ground. The stress paths and stress fields in the ground were studied and then compared with the advanced knowledge in soil mechanics in order to highlight the main features of granular materials for the penetration analysis. It was shown that the shear dilatancy, rate-dependency, particle crushing and non-coaxiality were the four main features that should be captured in future constitutive models for granular materials in the penetration analysis.