【作者】 罗勇；

【导师】 郭海燕；

【作者基本信息】 中国海洋大学 ， 港口、海岸及近海工程， 2003， 硕士

【摘要】 本文在总结国内外对双排桩支护结构的研究现状的基础之上，结合通用有限元软件Ansys，对门架式水力插板桩进行了二维非线性平面应变有限元分析，就其中的关键问题——桩与土的共同作用进行了研究。板桩采用线弹性，土体采用弹塑性本构关系，建立了桩土共同作用的有限元模型。由于桩体结构的材料性能与周围土层性质相差较大，在荷载作用下有可能在其接触面上产生较大的剪应力从而导致错动或开裂，为了充分反映桩土接触面上的受力及变形特征，考虑桩土之间的共同作用，在桩土接触面处设置面面接触单元，将采用接触单元和不采用接触单元两种算法的计算结果与模型试验结果进行比较，验证了本文接触界面处理的合理性。并针对具体算例，讨论了各种材料参数对板桩位移和接触应力的影响。在此基础上，利用Ansys软件提供的APDL语言，提出了以桩体最大变形为目标函数的优化设计方法，对板桩间距进行了优化设计。此外，还探讨了门架式水力插板桩的动力特性，以及桩长和桩间距对结构动力特性的影响。为进一步指导工程实践提供了理论依据。更多还原

【Abstract】 The domestic and abroad research about retaining structure with double-row piles is summarized, and its disadvantages are shown in this paper. Two-dimensional nonlinear plane-strain Fern analysis, which emphasizes the pile-soil interaction, is developed for portal water injection sheet piles with the software Ansys. Because of the different material property of the piles and soil, shear stress is produced on the contact surface between piles and soil, which may cause slide and crazing of the soil mass under workload. In order to reflect the mechanical character precisely on the contact surface, a new kind of element, plane-plane contact element is introduced. The principle of the process is presented in detail and the finite element model is established with the consideration of the soil’s elastoplastic constitutive relation. Compared with the examination results, the theoretical calculation results with finite element method demonstrate the feasibility of the contact element.With an engineering example, the influence of many material factors on piles deformation and contact stress of portal water injection sheet piles has been discussed. Based on the numerical results, an optimum design model, which considers the maximal deformation of the piles as objective function, is put forward with the computer language APDL provided by Ansys program. Finically, the dynamic property of portal water injection sheet piles is analyzed in this paper, and the influence on dynamic property of pile length and distance between piles is discussed in detail. Some valuable conclusions have been reached, which can do something useful to engineering practice.更多还原