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本文根据我国南方8个场址81个试样的动三轴试验资料,对土在等幅循环荷载作用下,其动模量和阻尼与应变幅值的关系进行了分析研究,并与现场测试结果进行对比。根据分析结果,本文提出一种广义双曲线模型,能更满意地描述各类土的应力应变关系,该模型保持了形式简便,参数物理意义明确等优点。文中还分别对砂土和粘土,给出了模型中参数的统计关系式,这些表达式能明显反映粘性土和非粘性土的特性及其差别。
Based on the dynamic triaxial test data of 81 samples at eight sites in the south of China, the relationship between the dynamic modulus, damping and strain amplitude of the soil under constant amplitude cyclic loading was analyzed and studied. The results are compared. According to the analysis results, a generalized hyperbolic model is proposed in this paper, which can describe the stress-strain relationship of various soils more satisfactorily. The model maintains the advantages of simple form and clear physical meaning of parameters. In the paper, the statistical relations of the parameters in the model are also given separately for sand and clay. These expressions can clearly reflect the characteristics and differences of clay soil and non-cohesive soil.