土石坝应力应变有限元计算中常采用邓肯E-B模型,模型参数大多通过三轴试验确定,但操作相对比较复杂,为此提出一种通过单剪试验确定邓肯E-B模型参数的方法,即对某一级配粗粒料进行单剪试验,将试验得到的单剪条件下的应力应变关系通过转换公式得到三轴条件下的应力应变关系,据此整理得到的邓肯E-B模型参数与三轴试验结果基本一致,并用该参数对单剪试验进行有限元数值模拟,得到的应力应变关系与试验结果较为吻合。 Duncan EB model is often used in finite element calculation of stress and strain of earth-rock dam. The model parameters are mostly determined by triaxial test, but the operation is relatively complicated. Therefore, a method to determine the parameters of Duncan EB model by single-shear test is proposed. With the single-shear test of coarse aggregate, the stress-strain relationship of single-shear test obtained by the test under the triaxial condition is obtained through the conversion formula. The Duncan EB model parameters thus obtained are basically consistent with those of the triaxial test , And using this parameter to simulate the shear test, the stress-strain relationship is in good agreement with the experimental results.