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砂–聚苯乙烯颗粒轻质填料由工程细砂和聚苯乙烯颗粒按一定比例混合形成,有利于节省胶凝材料、降低土工填料附加应力和减小地基沉降,探讨该材料的应力应变关系对指导其工程实践变得尤为重要。基于椭圆–抛物双屈服面模型,推导了考虑轻质填料配比和围压特征的应力应变增量形式方程,结合轻质填料三轴固结排水剪切试验中的应力应变特性,分析了所推导的应力应变增量形式方程的合理性。研究发现,基于椭圆–抛物双屈服面模型的考虑轻质填料配比和围压特征的应力应变增量形式方程能较好地拟合材料偏应力–轴向应变–体变规律,能较好地反映材料的弹塑性、剪胀性和剪缩性,并结合轻质填土的变形机理给予相应解释。
Sand - polystyrene particles lightweight filler from the fine sand and polystyrene particles mixed by a certain percentage, help to save the cementitious materials, reduce the additional stress of geotextiles and reduce the settlement of the foundation to explore the material stress-strain relationship It is particularly important to guide its engineering practice. Based on the elliptical-parabolic dual yield surface model, the equation of stress and strain increment considering the ratio and confining pressure of lightweight filler was deduced. Based on the stress-strain characteristics of the triaxial consolidation drainage test, The Reasonableness of the Formal Equation Derived from Stress and Strain Increment. It is found that the equation of stress and strain increment based on elliptic-parabolic dual yield surface model considering the light weight ratio and confining pressure characteristics can well fit the material’s deviatoric stress-axial strain-deformation law, which is better It reflects the elasto-plasticity, dilatancy and shear-shrinkability of the material, and gives the corresponding explanation in combination with the deformation mechanism of light fill.