基于Weibull分布的土-结构接触面剪切损伤模型研究

发布时间：2018-05-09 21:55

  本文选题：道路工程 + 损伤模型　； 参考：《公路交通科技》2017年05期

【摘要】：针对土-结构接触面剪切特性,基于现有统计损伤理论提出了土-结构接触面剪切损伤模型及模型参数的确定方法。利用大型直剪仪对红黏土-混凝土结构接触面进行直剪试验,分析了红黏土-结构接触面上剪应力-应变特性。根据试验结果得到红黏土-结构接触面剪切损伤模型的相关参数,建立了基于Weibull分布的损伤模型参数与法向应力的关系,并对模型进行了修正。最后将理论计算结果与试验结果进行了对比分析,验证了该模型的合理性。研究成果表明:法向应力水平越大,黏性土-结构接触面剪切软化现象越不显著,应力应变关系由软化型转变为弱软化型。通过对接触面直剪试验的成果进行验证,模型计算与试验结果吻合较好,证明了文中提出的剪切损伤模型具有能够充分反映土-结构接触面软化特性和应力状态的特点,模型参数较少。
[Abstract]:According to the shear characteristics of soil-structure interface, based on the existing statistical damage theory, the shear damage model of soil-structure contact surface and the method of determining the parameters of the model are proposed. The shear stress-strain characteristics of red clay concrete structure interface are analyzed by using a large direct shear apparatus. Based on the experimental results, the parameters of the shear damage model of the red clay structure interface are obtained. The relationship between the parameters of the damage model and the normal stress based on the Weibull distribution is established, and the model is modified. Finally, the rationality of the model is verified by comparing the theoretical results with the experimental results. The results show that the greater the normal stress level, the less obvious the shear softening of the clay soil-structure interface, and the change of the stress-strain relationship from softening type to weak softening type. Through the verification of the results of direct shear test on the contact surface, the model calculation is in good agreement with the experimental results. It is proved that the proposed shear damage model can fully reflect the softening characteristics and stress state of soil-structure interface. The model parameters are less.
【作者单位】： 中南大学土木工程学院;
【基金】：国家自然科学基金项目(51378514)
【分类号】：U416.01
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本文编号：1867566