中文摘要：

基于胶凝砂砾石坝坝料大三轴试验改进非线性解耦 K-G 模型，提出一种可反映胶凝砂砾石坝坝料应变软化特性和剪胀特性的非线性 K-G-D 本构模型；结合试验结果及回归分析方法确定模型的体积模量、剪切模量、剪胀模量及其包含的重要参数；最后对非线性 K-G-D 本构模型进行了验证，得出数值模拟结果与试验采集的数据基本吻合，表明该模型可为胶凝砂砾石坝的计算分析及设计提供参考。

英文摘要：

Through a large-scale triaxial test, a new type of nonlinear K-G-D constitutive model, which can describe the strain softening and dilatancy of cemented sand and gravel （CSG） material, was developed based on the K-G constitutive model. The bulk modulus, shear modulus, dilatancy modulus, and other important parameters of the model were determined according to the test results and regression analysis. The nonlinear K-G-D constitutive model was verified. The results show that the calculated values agreed with experimental data, indicating that the model can provide references for the design and analysis of dams with CSG materials.