發(fā)布時間：2018-03-16 16:04

  本文選題：水平荷載　切入點：單樁　出處：《深圳大學》2017年碩士論文　論文類型：學位論文

【摘要】：已有的與粘土中水平受荷樁相關的研究通常只考慮單向水平荷載,而在很多情況下,單樁所受的水平力非常復雜,如由風、海浪或地震引起從而施加到樁基上的水平載荷往往是多方向的,荷載的大小和方向在加載過程中都可能發(fā)生變化。砂土中的樁基模型試驗研究表明,多向路徑下樁的水平承載力通常低于單向路徑下樁的水平承載力,而且減小的程度與加載路徑的特性相關。本文采用室內模型試驗的方法,研究了水平多向單調和循環(huán)荷載作用下軟粘土和硬粘土中單樁的工作性狀,并對試驗結果進行了深入的分析,論文主要內容包括:(1)簡要闡述了水平受荷樁的應用背景,總結了國內外水平受荷樁的研究現狀,從中發(fā)現了目前水平受荷樁研究存在的不足,進而確定了研究方向;(2)通過室內模型試驗,研究了不同水平多向單調加載路徑下,單樁在軟、硬粘土中的響應,發(fā)現加載路徑對樁的水平承載特性有比較顯著的影響;(3)通過室內模型試驗,研究了軟、硬粘土中單樁在單向循環(huán)加載后,沿不同水平方向加載的響應,揭示了單向循環(huán)荷載對單樁沿不同水平方向承載力的影響;(4)通過室內模型試驗,研究了不同水平多向循環(huán)荷載作用下,軟、硬粘土中單樁的響應。通過試驗結果的對比分析發(fā)現,多向加載路徑下的荷載 位移關系曲線的特性與單向的具有明顯的區(qū)別,且荷載最大值都較單向荷載作用下的低;(5)將軟、硬粘土中單樁在不同路徑下觀測到的現象和結果進行對比分析,發(fā)現在軟粘土中加載路徑對樁-土相互作用的影響更明顯。
[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.
【學位授予單位】：深圳大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU473.1

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