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在已提出的黄土湿载结构性本构模型的基础上,通过对天然黄土应力应变特性的数值模拟及数值模拟结果与黄土的试验结果对比,分析了结构性黄土的应力应变关系特征。研究结果表明:所提出的黄土湿载结构性本构模型在描述饱和重塑黄土的力学特性方面与修正剑桥模型具有相同的特性;模型仍然能够模拟具有不同含水率的重塑黄土的宏观力学反应;更重要是所建议的模型在模拟天然结构性黄土的力学特性方面,相对于剑桥模型及修正剑桥模型,具有明显的优势,更能对实验室所试验的天然结构性黄土的宏观力学特性给出准确的描述。通过黄土常规三轴实验室试测结果的对比分析,论证了所提出的黄土的湿载结构性本构模型的合理性和准确性。
Based on the proposed constitutive model of loess moisture load, the stress-strain relationship of structural loess is analyzed through the numerical simulation of the stress-strain characteristics of natural loess and the numerical simulation results compared with the loess test results. The results show that the proposed constitutive model of loess moisture load has the same characteristics as the modified Cambridge model in describing the mechanical properties of saturated remolded loess. The model can still simulate the macroscopic mechanical responses of remolded loess with different water contents ; More importantly, the proposed model has obvious advantages over the Cambridge model and the modified Cambridge model in simulating the mechanical properties of natural structural loess. It is more advantageous to the macroscopic mechanical properties of the natural structural loess tested in the laboratory Exact description. Through the comparative analysis of the test results of conventional loess three-axis laboratory, the rationality and accuracy of the proposed constitutive model of loess load are demonstrated.