无黏性土压缩曲线的一种数学模式

A compression model for cohesionless soils

总结和分析了已有考虑状态相关的无黏性土压缩曲线数学模式做了。进行了不同初始密度砂土的等向压缩试验,提出了一个新的状态相关压缩曲线数学模式。该数学模式能够反映无黏性土不同初始状态等向压缩下的应力-应变关系,参数物理意义明确、试验确定方法简单、方便。利用4种不同砂土的等向压缩试验数据,验证了所提出的数学模式的合理性和有效性。该模式可应用于一般应力、应变条件下状态相关本构模型的建立。

Some existing state-dependent mathematic models for compression curve of cohesionless soils are described and analyzed briefly.Isotropic compression tests on sand with different initial densities are performed.On basis of the results,a new state-dependent stress-strain model for cohesionless soil under hydrostatic compression is proposed.The model is able to describe well stress-strain behaviour which develops throughout first loading and can be adaptable to different freshly deposited cohesionless soils subjected to isotropic compression over a wide range of stresses and densities.The model parameters can be determined simply and conveniently from isotropic compression test.Comparison with experimental data of four types of sands indicates that the model can gives excellent predictions to the measured isotropic compressive behaviour;and it can be used to construct generalized state-dependent constitutive models.