本文根据粗颗粒土大量的三轴压缩试验结果的应力～应变特性和强度变化规律,对邓肯模型作了较大的改进,并提出了表达抗剪强度包线的特征表示式.同时,文中对影响强度的一些因素,以及切线泊松比的一些变化规律作了讨论. In this paper, the Duncan model is greatly improved according to the stress-strain characteristics and intensity variation of the results of a large number of triaxial compression tests on coarse-grained soils, and a characteristic expression for the expression of shear strength envelopes is proposed. Some factors affecting the strength, as well as some variations of the tangent Poisson’s ratio, are discussed.