风机梁板式桩筏基础承载特性大型模型试验研究

发布时间：2018-10-22 07:58

【摘要】：梁板式桩筏基础与传统桩筏基础一样具有较高的承载力和变形控制能力,且较传统桩筏基础能够节约成本,具有重要经济效应,因而成为了新兴的基础形式被应用于风电基础中。然而目前该基础仍采用传统桩筏基础的设计方法进行计算,造成了巨大的浪费。为了弥补目前梁板式风机基础设计方法的缺陷,采用大型室内模型试验对梁板式风机基础的受力变形特性进行研究,分析了竖向荷载作用下梁板式风机基础内梁、桩、土体等的受力机制及特性。研究表明,在工作荷载范围内,梁板式桩筏基础体系处于弹性状态,且梁板式桩筏基础具有一定的柔性,中央与边缘存在一定的差异沉降。桩-桩相互作用及桩-土相互作用对具有一定柔性的梁板式桩筏基础受力变形特性具有重大的影响,应该修正现行设计时不考虑这几个因素的缺点。
[Abstract]:The beam-plate pile-raft foundation has the same high bearing capacity and deformation control ability as the traditional pile-raft foundation, and it can save the cost and has important economic effect compared with the traditional pile-raft foundation. As a result, it has become a new basic form which is applied to wind power foundation. However, the traditional design method of pile-raft foundation is still used to calculate the foundation, which results in a huge waste. In order to remedy the defects of the present design method of beam-plate fan foundation, the mechanical and deformation characteristics of beam-plate fan foundation were studied by large-scale indoor model test, and the inner beam and pile of beam-plate fan foundation under vertical load were analyzed. Mechanical mechanism and characteristics of soil etc. The results show that the beam-plate pile-raft foundation system is elastic in the range of working load, and the beam-plate pile-raft foundation is flexible, and there is a certain differential settlement between the center and the edge of the beam-plate pile-raft foundation. The pile-pile interaction and pile-soil interaction have great influence on the behavior of the beam-plate pile-raft foundation with certain flexibility. The shortcomings of these factors should be corrected in the present design.
【作者单位】：同济大学岩土与地下工程教育部重点实验室;同济大学地下建筑与工程系;国华能源投资有限公司;
【基金】：国家重点基础研究发展计划(973项目)(No.2013CB036304) 国家自然科学基金(No.51208378)
【分类号】：TU476

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