本文在两个方面对非线性邓肯(Duncan)模型进行修正:(1)针对坝体填筑过程中σ_3随σ_1的增加而增加的状况,在全微分概念下给出了考虑△σ_3增减影响的切线模量表达式;(2)考虑轴对称与平面应变两种应力状态之间的差异,对常规三轴试验给出的计算参数进行了平面应变修正,并使这种修正程序化。通过采用4种方案对湖南铁山坝进行的应力应变计算及其与原型观测资料所作的对比分析可知,修正的邓肯模型计算结果与实测资料吻合较好。 This paper corrects the nonlinear Duncan model in two aspects: (1) Considering the situation that σ_3 increases with the increase of σ_1 during dam filling, the effect of △σ_3 increases and decreases is given under the concept of full differentiation. Tangent modulus expression; (2) Considering the difference between the two stress states of axisymmetric and plane strain, the plane strain correction is performed on the calculated parameters given in the conventional triaxial test, and this correction is programmed. Through the use of four schemes for the stress and strain calculations of the Tieshan Dam in Hunan and its comparative analysis with the prototype observations, it can be known that the modified Duncan model is in good agreement with the measured data.