聚苯乙烯轻质混合土应力-应变特性分析

根据聚苯乙烯轻质混合土单轴应力-应变曲线和三轴应力-应变曲线的形态 ,得出水泥掺入比、密度、含水率、龄期等对聚苯乙烯轻质混合土变形特性有不同程度的影响 ;在围压作用下 ,曲线类型为应变硬化型 ,围压不同 ,主应力差大小不同。基于试验结果 ,得出聚苯乙烯轻质混合土单轴应力应变关系符合双曲线模型 ,三轴应力应变关系符合弹性 -线性强化模型 ,并对应力应变曲线进行拟合。

Study on the stress-strain characteristics of light heterogeneous soil mixed with expanded polystyrene

The influences of cement content, density, water content and age on the deformation behavior of the light heterogeneous soil are studied based on the uniaxial and triaxial stress-strain curves. The type of stress-strain curves is that of strain hardening with different cell pressures, but the principal stress difference varies with variation of confining pressure. The results of tests indicates that a hyperbolic model and a flexible-linear hardening model can reasonably simulate the stress-strain relations under uniaxial and triaxial stresses conditions respectively.