被动桩水平位移荷载施加位置的探讨

发布时间：2018-07-07 16:36

本文选题：被动桩 + 路堤　；参考：《岩土力学》2015年10期

【摘要】：被动桩是指一种由于土体水平位移而发生挠曲变形的桩。目前不论是室内试验还是数值计算,常在模型边界对土体施加水平位移荷载(位移边界条件)形成土体的位移场,用来研究被动桩的变形特征,但不同研究者采用的水平位移施加位置(边界位置)与被动桩的距离存在较大差异。结合一个工程案例,采用有限单元法对水平位移加载位置进行了单变量参数分析。研究表明,随着水平位移加载位置与被动桩距离的增加,桩身变形显著减小。这表明了施加位移边界后地基中存在明显的应力扩散。当该距离小于5.5倍桩径时,在模型边界施加同等大小的水平位移所需应力显著增加。同时讨论了水平荷载加载位置与被动桩距离的合理范围,认为应在5~8倍桩径范围之内。
[Abstract]:Passive pile is a kind of pile with deflection due to horizontal displacement of soil. At present, the displacement field of soil is usually formed by applying horizontal displacement load (displacement boundary condition) to the soil at the model boundary, which is used to study the deformation characteristics of the passive pile, whether in laboratory test or numerical calculation. However, the distance between the position of horizontal displacement applied by different researchers and the passive pile is quite different. Combined with an engineering case, the single variable parameter analysis of the horizontal displacement loading position is carried out by using the finite element method. The results show that with the increase of the horizontal displacement loading position and the passive pile distance, the pile deformation decreases significantly. This indicates that there is obvious stress diffusion in the foundation after the application of the displacement boundary. When the distance is less than 5.5 times of the diameter of the pile, the stress required to apply the same horizontal displacement at the boundary of the model increases significantly. At the same time, the reasonable range of the distance between the horizontal loading position and the passive pile is discussed, and it is considered that it should be within the range of 5 ~ 8 times the diameter of the pile.
【作者单位】：同济大学地下建筑与工程系;同济大学岩土及地下工程教育部重点实验室;
【基金】：国家自然科学基金(No.41172248)
【分类号】：TU473.1

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