埋藏式钢岔管与外围结构的联合作用分析

发布时间：2018-09-10 09:34

【摘要】：为了更深入地了解埋藏式岔管与外围结构联合承载的力学机理,采用三维有限元法对岔管与外围结构联合作用做了精细的力学仿真。尝试了一种新的模型,即设置回填混凝土网格,模拟钢岔管、混凝土、围岩三者之间的两道缝隙及其力学接触行为,考虑混凝土承载后的塑性变形特征。结果表明,岔管与外围结构在空间中的相互作用过程复杂:由于岔管与外围结构联合承载,使钢材强度得到了充分的发挥;回填混凝土未沿径向均匀开裂,基于此假定的力学模型值得商榷;回填混凝土变形应被充分重视,有些部位的压缩变形甚至大于结构间原始缝宽,不利于联合承载;两道缝模式得出的内水压力围岩分担率明显低于一道缝模式,后者可能高估了围岩分担率。研究成果为埋藏式岔管受力分析提供了一种新模式。
[Abstract]:In order to understand the mechanics mechanism of buried bifurcated pipe and peripheral structure, the three-dimensional finite element method is used to simulate the interaction between the branch pipe and the peripheral structure. In this paper, a new model is proposed to simulate the mechanical contact behavior of two cracks between steel bifurcation, concrete and surrounding rock by setting up backfill concrete mesh, and considering the plastic deformation characteristics of concrete bearing. The results show that the interaction process between the bifurcated pipe and the peripheral structure in space is complex: due to the joint loading of the bifurcation pipe and the peripheral structure, the strength of the steel is brought into full play, and the backfill concrete does not crack uniformly along the radial direction. The mechanical model based on this assumption is debatable, the deformation of backfill concrete should be paid more attention to, the compression deformation of some parts is even larger than the width of the original joint between the structures, which is not conducive to joint bearing. The distribution rate of inner water pressure surrounding rock is obviously lower than that of one joint model, which may overestimate the surrounding rock sharing rate. The research results provide a new model for the analysis of buried bifurcated pipes.
【作者单位】：中国水利水电科学研究院流域水循环模拟与调控国家重点实验室;华东桐柏抽水蓄能发电有限责任公司;新疆水利水电勘测设计研究院;
【基金】：国家自然科学基金项目(51579252) 中国水科院科研专项(材基本科研KY1612)
【分类号】：TV732.4

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