【作者】 李文；

【导师】 赵明华；

【作者基本信息】 湖南大学 ， 岩土工程， 2013， 硕士

【摘要】 基坑支护作为岩土工程学科中的一个热点问题，一直以来广受研究者的关注，近年来对其的研究进展迅速，并取得了丰硕成果。悬臂排桩支护是其中一种比较常用的支护方式，它依靠自身的刚度和强度就能维持其稳定。它的突出特点是施工简便、对环境影响较小以及造价比较低，因而在工程实践中得到了广泛采用。关于悬臂排桩的计算理论已经有着不少研究成果，但还是存在着这样或那样的不足，鉴于此，本文拟利用有限杆单元法对悬臂排桩支护结构的计算进行深入的讨论与研究。首先，本文对土压力理论进行了回顾，详细分析了土压力计算理论的一些改进和发展；然后介绍了支护结构内力计算常用的方法，并分别说明了各种计算理论的局限性和适用范围。其次，在对排桩支护进行简单介绍的基础上，对悬臂排桩支护结构内力计算的常用计算理论进行了分析，分别阐述了其基本原理和计算步骤，并最终指出了它们存在的的局限性。再次，在实际情况中，桩侧土压力是呈非线性变化的，而现有理论对这一点的考虑尚有不足。因此，本文在充分借鉴弹性法和共同变形法的优点的基础上，建立了非线性的桩-土相互作用模型，并由此提出了一种可以考虑桩-土相互作用的悬臂排桩支护结构计算方法。最后，通过工程实例对本文方法进行了验证，并将本文方法与经典方法的计算结果进行了比较，然后分析了其主要影响因素。结果表明，本方法具有工程实用性。更多还原

【Abstract】 As a hot topic of the geotechnical engineering, the foundation pit has arousedmore and more concern, and the study of it grows rapidly in recent years, obtainingfruitful achievements. The cantilever pile is a traditional retaining structure, whichcan maintain stability by its own stiffness and strength. Convenient operation, littleeffect and less expense are cantilever pile’s feature, so it is widely used in engineeringpractice. The research on calculating method of cantilever piles has acquired manyachievements, but it still has its’ limitation, so this paper proposed a new method forfurther study of cantilever piles by using finite element methods.First, the paper reviewed theories of earth pressure, and analyzed the progress ofthe theory, then outlined the calculation theories of retaining structure, at last pointedout the advantage and disadvantage of these methods.Secondly, on the basis of introducing the row pile retaining structure, the articleanalyzed the common used calculation theories for cantilever piles, presented its’basic principle and steps, and finally indicated the theories’ limitation.Thirdly, in fact, the earth pressure acting on piles distributes in nonlinear style,which is not considered properly by current theories.So with combining the elasticmethod and common deformation theory, the paper established a nonlinear pile-soilinteraction model, and proposed a method for calculating the internal forces ofcantilever piles is proposed, which can consider the pile-soil interaction and nonlineardistribution of earth pressure.Finally, the article verified the theory by an engineering example, then contrastedthe results computed by new method with classical method, and at last the insidefactors are discussed. The result shows that the proposed method is practical inengineering.更多还原