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土体小应变刚度特征是准确分析土与结构相互作用的重要因素。土体刚度的衰减速率宜由带有小应变量测装置的高等三轴实验确定,这制约了土的小应变刚度模型的应用。另外,虽然该类实验在国外已对典型土体进行了较系统的研究,但是在国内还鲜有报道。该文结合小应变理论,提出了加载为正弦函数和卸载为双曲线形式的弹塑性模型,并且针对多种土体将模型的计算结果与实验值进行对比,二者的基本符合证明了模型的合理性。
The characteristics of soil small strain stiffness is an important factor to accurately analyze the interaction between soil and structure. The decay rate of soil stiffness should be determined by a higher triaxial experiment with a small strain gauge, which limits the application of the soil’s small strain stiffness model. In addition, although this kind of experiment has done a systematic study on typical soil in foreign countries, it is rarely reported in China. According to the theory of small strain, the elasto-plastic model which is loaded with sine function and unloaded as hyperbolic curve is proposed, and the calculated results of the model are compared with the experimental values for a variety of soils. The basic conformity of the two models proves that the model rationality.