【作者】 刘凌云；

【导师】 郭海燕；

【作者基本信息】 中国海洋大学 ， 防灾减灾工程及防护工程， 2005， 硕士

【摘要】 本文对门架式水力插板桩的抗倾覆稳定性和抗滑移稳定性进行了分析研究。 首先,本文在双排桩支护体系的研究基础上,结合有限元软件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,并就其关键问题——桩与土的相互作用进行了研究。计算过程中,土体选择弹塑性DRUKER-PRAGER本构关系,板桩采用线弹性模型,并在桩与土的接触面上设置面—面的接触单元。在有限元计算结果的基础上,建立了相应的有限空间的土压力计算公式,首次对门架式水利插板桩在软粘土中的抗倾覆进行了分析研究。结果表明,土体粘聚力和内摩擦角越大,越有利于提高门架式水力插板桩的抗倾覆稳定性。当双排桩间距为1/3～2/3开挖深度时,前后排板桩共同作用的抗倾覆能力最强。 其次,本文首次推导了门架式水利插板桩抗滑移稳定性的简化Bishop法的积分形式,并建立了抗滑移完善了极限平衡理论。将本文计算结果与土坡稳定分析软件GEO—slope的结果相比较,验证了本文计算方法的可行性。进而对门架式水力插板桩的抗滑移稳定性进行了分析研究。研究结果表明,土体的内摩擦角和粘聚力对门架式水力插板桩抗滑移稳定性影响大,增加前排桩的埋深比增加双排桩间距更能提高门架式水利插板桩的抗滑移稳定性。更多还原

【Abstract】 The main work of this dissertation is to analyze the stability against overturning and slope of the portal water injection sheet pile..Firstly, the two-dimensional nonlinear plane-strain FEM analysis, based on the theory of the double-row piles, which emphasizes the pile-soil interaction, is developed for the portal water injection sheet piles with the finite element analysis software ANSYS. The earth satisfies the elastic and plastic nonlinear characteristics of DRUCKER-PRAGER, and the pile follows the linear and the elastic characteristics. And also, the earth pressure formulate of the finite space is obtained with the result of the FEM. Further more, the stability against overturning of the portal water injection sheet pile is analyzed. The result shows that the bigger the cohesion and the friction angle, the batter the stability against overturning of the structure. Another result is that the stability reaches the best when the space between the two piles is in the 1/3-2/3 of the excavating highest.Secondly, the integral formulate is obtained of the stability of slopes of portal water injection sheet pile, which perfects the limit equation theory. The method in this dissertation is verified to be feasibility when its result is compared with that of the software GEO-slope. Meanwhile, the analysis of slopes stability is developed to the portal water injection sheet pile. It shows in the result that the cohesion and friction angle have much influence on the stability of slopes of the structure. And the result also shows that increasing the embedded depth will improve the stability of slopes of the portal water injection sheet pile more than increasing the space between the two piles.更多还原