基于统计损伤理论的邓肯—张修正模型研究

发布时间：2018-05-15 22:21

本文选题：统计损伤理论 + 邓肯—张模型　；参考：《水利水电技术》2017年04期

【摘要】：由于邓肯—张EB模型没有考虑颗粒破碎损伤对材料变形及强度的影响,不能模拟堆石料应变软化的缺陷,故将统计损伤理论引入邓肯—张双曲线模型。通过探讨堆石料应力—应变曲线不同阶段损伤变量的规律,描述堆石料的损伤破碎过程,考虑其损伤阈值的影响,建立了邓肯—张修正模型表达式,该模型参数能通过试验数据拟合得出。经过验证,邓肯张修正模型在高围压下能较好的模拟堆石料破碎损伤的全过程,低围压下退化为常规邓肯—张模型。与传统邓肯—张模型、统计损伤模型、弹塑性模型及试验结果相比较,其形式简单、参数少。研究成果可应用于底部围压较大的高堆石坝分析,为堆石坝的设计计算提供参考。
[Abstract]:The statistical damage theory is introduced to the Duncan-Zhang hyperbolic model because the Duncan-Zhang EB model does not consider the effect of particle breaking damage on the deformation and strength of materials and can not simulate the defect of strain softening of rockfill. Through discussing the law of damage variable in different stages of stress-strain curve of rockfill, describing the damage and breaking process of rockfill, considering the influence of damage threshold, the modified model expression of Duncan Chang is established. The model parameters can be obtained by fitting the experimental data. It is proved that Duncan's modified model can simulate the whole process of rockfill damage under high confining pressure and degenerate into conventional Duncan's-Zhang model at low confining pressure. Compared with the traditional Duncan-Chang model, the statistical damage model, the elastoplastic model and the experimental results, the form is simple and the parameters are less. The research results can be applied to the analysis of high rockfill dams with high bottom confining pressure and provide reference for the design and calculation of rockfill dams.
【作者单位】：中国农业大学水利与土木工程学院;南水北调中线干线工程建设管理局;
【基金】：国家自然科学基金青年基金项目(51309224)
【分类号】：TV41

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