【摘要】 基于最大能量耗散率原理的黄土弹塑性本构模型，设计出获取该模型参数的室内试验方案，并以泾阳南塬为研究区域，研究不同含水率下Q₃马兰黄土本构参数的取值范围和硬化函数的形式。研究结果表明：泾阳南塬Q₃马兰黄土塑性剪应变的硬化函数呈双曲线型，其参数a取值范围在0.002至0.02之间，参数b在0.01至0.05之间；塑性体应变的硬化函数呈三次函数型，其参数m₁、m₂、m₃取值在0.001至1之间；体积模量K取值在40 MPa至130 MPa之间，剪切模量G取值在20 MPa至60 MPa之间；与试验数据对比验证，该本构模型通过试验方案取得的参数，可以准确地描述泾阳南塬Q₃马兰黄土的应力应变关系。更多还原

【Abstract】 The traditional loess constitutive model is mainly composed of elastic model and elastic-plastic model. However, the assumption of elastic model on soil is too simple, and the elastic-plastic model sometimes does not meet the law of thermodynamics. Therefore, the loess constitutive model for elastic-plastic deformation based on the principle of maximum energy dissipation rate is more rigorous. Based on the constitutive model, a laboratory test scheme was designed to obtain the parameters of the model. Taking Southern Jing-Yang plateau as the study area, the value range of constitutive parameters and the form of hardening function of Q₃ Malan loess under different water content were studied. The results show that: the hardening function of the plastic shear strain of Q₃ Malan loess in Southern Jing-Yang plateau is hyperbolic, the value of parameter a ranges from 0.002 to 0.02,and that of parameter b ranges from 0.01 to 0.05; the hardening function of the plastic body strain is cubic, and its parameters m₁、m₂、m₃ are between 0.001 and 1;the volume modulus K ranges from 40 MPa to130 MPa and the shear modulus G ranges from 20 MPa to 60 MPa; compared with the experimental data, the constitutive model can accurately describe the stress-strain relationship of Q₃ Malan loess in Southern Jing-Yang plateau by using the parameters obtained from the experimental scheme.更多还原