粘土中水平多向受荷单桩承载特性的试验研究

发布时间：2018-03-16 16:04

本文选题：水平荷载　切入点：单桩　出处：《深圳大学》2017年硕士论文　论文类型：学位论文

【摘要】：已有的与粘土中水平受荷桩相关的研究通常只考虑单向水平荷载,而在很多情况下,单桩所受的水平力非常复杂,如由风、海浪或地震引起从而施加到桩基上的水平载荷往往是多方向的,荷载的大小和方向在加载过程中都可能发生变化。砂土中的桩基模型试验研究表明,多向路径下桩的水平承载力通常低于单向路径下桩的水平承载力,而且减小的程度与加载路径的特性相关。本文采用室内模型试验的方法,研究了水平多向单调和循环荷载作用下软粘土和硬粘土中单桩的工作性状,并对试验结果进行了深入的分析,论文主要内容包括:(1)简要阐述了水平受荷桩的应用背景,总结了国内外水平受荷桩的研究现状,从中发现了目前水平受荷桩研究存在的不足,进而确定了研究方向;(2)通过室内模型试验,研究了不同水平多向单调加载路径下,单桩在软、硬粘土中的响应,发现加载路径对桩的水平承载特性有比较显著的影响;(3)通过室内模型试验,研究了软、硬粘土中单桩在单向循环加载后,沿不同水平方向加载的响应,揭示了单向循环荷载对单桩沿不同水平方向承载力的影响;(4)通过室内模型试验,研究了不同水平多向循环荷载作用下,软、硬粘土中单桩的响应。通过试验结果的对比分析发现,多向加载路径下的荷载位移关系曲线的特性与单向的具有明显的区别,且荷载最大值都较单向荷载作用下的低;(5)将软、硬粘土中单桩在不同路径下观测到的现象和结果进行对比分析,发现在软粘土中加载路径对桩-土相互作用的影响更明显。
[Abstract]:Existing studies related to horizontally loaded piles in clay generally only consider unidirectional horizontal loads, and in many cases the horizontal forces on a single pile are very complex, such as wind, The horizontal load caused by wave or earthquake is often multi-directional, and the magnitude and direction of the load may change during the loading process. The horizontal bearing capacity of pile under multi-path is usually lower than that of pile under unidirectional path, and the degree of reduction is related to the characteristics of loading path. The working behavior of single pile in soft clay and hard clay under horizontal monotone and cyclic loading is studied, and the experimental results are deeply analyzed. The main contents of this paper include: (1) the application background of horizontal loaded pile is briefly described. This paper summarizes the present research situation of horizontal loaded piles at home and abroad, and finds out the shortcomings of the research on horizontal loaded piles at present, and then determines the research direction. (2) through the indoor model tests, the paper studies the different horizontal monotonic loading paths. The response of single pile in soft and hard clay, it is found that the loading path has a significant effect on the horizontal bearing behavior of pile. (3) through laboratory model tests, the single pile in soft and hard clay under unidirectional cyclic loading is studied. The effect of unidirectional cyclic load on the bearing capacity of single pile along different horizontal direction is revealed. Through the comparison and analysis of the test results, it is found that the characteristics of the load-displacement relation curve under the multi-direction loading path are obviously different from those of the unidirectional one. The maximum load is higher than that under unidirectional loading. The phenomena and results observed by single pile in soft and hard clay under different paths are compared and analyzed. It is found that the effect of loading path in soft clay on pile-soil interaction is more obvious.
【学位授予单位】：深圳大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU473.1

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