水平受荷大直径桩基尺寸效应产生机理与特征研究

项目名称： 水平受荷大直径桩基尺寸效应产生机理与特征研究

项目编号： No.41502273

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 地质学

项目作者： 李卫超

作者单位： 同济大学

项目金额： 23万元

中文摘要： 在水平受荷大直径桩基础的研究中，缩尺模型试验作为一种经济且可行的重要研究方法得到了广泛的应用。它是依据一定的比例条件将原位足尺地基基础体系的尺寸等缩小而开展的物理模型试验。从而，基于该模型试验结果，预测原位足尺地基基础相互作用性状。能否有效的减小缩尺模型试验中存在的尺寸效应问题并合理的分析缩尺模型试验结果决定了基于该方法的研究的成败。本项目拟针对水平受荷桩基，开展三个方面的深入研究：1.阐释尺寸效应的产生机理与作用特征；2. 探讨缩尺模型试验结果的分析方法；3.提出水平受荷大直径桩基的分析设计方法。本项目拟通过一系列不同缩尺比例模型试验及数值模拟，并结合原位大比尺水平受荷桩基试验进行研究，预期建立一套完整可行的缩尺模型试验研究方法，进而提出针对于水平受荷大直径桩基的分析设计方法。

中文关键词： 模型试验；数值模拟；尺寸效应；桩基础；水平荷载

英文摘要： With its economic efficiency and feasibility, scaled model test is widely used as one of the most important research tools in studies on the laterally loaded monopile (piles with large diameter). It is designed by scaling the full-scale soil-structure system, e.g. length, with the pre-designed scales and performed as physical modelling. The response of field full-scale soil-structure is evaluated according to the model test results. Since effectively reducing the negative effect of scaling and reasonably analyzing the model test results are keys to the success of model test study, this program is designed to explore following topics with regard to laterally loaded monopiles: 1. Elucidating the mechanism and characteristic of scaling effect; 2. Exploring the analyzing method on scaled model test results; 3. Refining design method for laterally loaded monopiles. Series of model tests and numerical simulations with different scales, as well as field large-scale tests on laterally loaded model monopile, will be performed and analyzed in this program. The expected outputs of this program include: building a feasible research tool which is scaled model test based and recommending a reliable design method for laterally loaded monopiles.

英文关键词： model test;numerical simulation;scale effect;pile foundation;lateral load