粗粒料已成为山区高填方工程的主要填筑材料,建立能较全面反映其力学特性的本构模型,对高填方工程的模拟分析及安全评价具有重要意义。在已有大型三轴试验研究的基础上,通过将硬化土模型与修正剑桥模型相结合同时引入对数形式的非线性强度参数关系式,建立了一种简便实用的弹塑性本构模型。该模型不仅能考虑应力水平对粗粒料应力-应变关系、体变特性、强度特性的影响,还能较好地反映粗粒料的应力路径相关性,模拟复杂应力状态下的粗粒料的变形特性,并且相关参数通过常规三轴试验即可测定。最后通过与不同应力路径试验结果进行对比,证明了模型的合理性。 Coarse aggregate has become the main filling material for high-fill project in mountainous area. Establishing a constitutive model that can comprehensively reflect its mechanical properties is of great significance to the simulation analysis and safety evaluation of high-fill project. Based on the existing large-scale triaxial tests, a simple and practical elasto-plastic constitutive model is established by combining the hardening soil model with the modified Cambridge model while introducing the logarithmic form of nonlinear strength parameter relations. The model can not only consider the effect of stress level on the stress-strain relationship, the bulk strain property and the strength property of coarse aggregate, but also reflect the stress path correlation of coarse aggregate well, and simulate the coarse aggregate under complex stress state Deformation characteristics, and related parameters can be determined by conventional triaxial test. Finally, the comparison with the test results of different stress paths proves the rationality of the model.