基于层面参数等效的碾压混凝土坝渗流场与应力场耦合分析

发布时间：2018-03-17 16:33

本文选题：碾压混凝土坝　切入点：参数渐变　出处：《水利水运工程学报》2017年05期 　论文类型：期刊论文

【摘要】：受施工、龄期、环境及服役期大坝承受的反复静动荷载等多因素影响,坝体和层面出现不同程度的劣化损伤,碾压层本体及层面物理参数呈渐变特性。针对碾压层内力学参数渐变的特性,提出了相应物理参数的等效算法,且给出了耦合性态参数间的数学转换关系,分析坝体应力场与渗流场相互影响机理,据此建立了考虑层内参数渐变的碾压混凝土坝渗流场与应力场耦合分析模型,并编制了相应的有限元分析程序。工程实例分析表明,耦合作用致使大坝的渗流场发生改变,坝体的应力较未耦合时普遍偏大,坝踵处的应力集中显著;渗流场与应力场耦合作用激励下的不利因素可为大坝的设计、施工及安全运行提供参考。
[Abstract]:Affected by many factors, such as repeated static and dynamic loads of construction, age, environment and service period, the dam body and plane appear different degrees of deterioration damage, The physical parameters of the roller compaction layer and the layer are gradually changing. In view of the gradual change of the mechanical parameters in the roller compaction layer, the equivalent algorithm of the corresponding physical parameters is proposed, and the mathematical transformation relationship between the coupling state parameters is given. The interaction mechanism of stress field and seepage field of dam body is analyzed. Based on this, a coupling analysis model of seepage field and stress field of RCC dam considering the gradual change of in-layer parameters is established, and the corresponding finite element analysis program is worked out. The coupling effect causes the seepage field of the dam to change, the stress of the dam body is generally larger than that of the uncoupled dam, and the stress concentration at the dam heel is obvious, and the unfavorable factor under the coupling of seepage field and stress field can be the design of the dam. Construction and safe operation to provide reference.
【作者单位】：南昌大学建筑工程学院;
【基金】：国家自然科学基金资助项目(51569014,51409139,51669013,51779115)
【分类号】：TV223.4;TV544.921

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