【作者】 龚敏；

【导师】 何林；

【作者基本信息】 哈尔滨工业大学 ， 结构工程， 2009， 硕士

【摘要】 双排桩是一种新型的基坑支护方式,具有场地限制条件少、支护效果突出等优点。本文在国家自然科学基金(50508012、50538030)和黑龙江省科技创新人才研究专项资金(2008RFQXG058)以及黑龙江省建工集团的支持下,展开了对双排桩支护结构基本力学性能分析的研究。本文在总结前人研究成果的基础上,分析了桩土相互作用基本特征,并用ABAQUS仿真了其力学性能的演变过程,最后初步分析了双排桩在强降雨环境下的性态反应,获得了双排桩在特殊条件下的一些基本特点。本文主要研究内容如下:(1)总结了双排桩国内外发展研究现状,归纳分析了目前存在的问题,阐述了有限元计算方法的优越性。(2)提出了二维模型尺寸建议,在二、三维模型对比基础上,阐述了各自的优缺点。(3)对双排桩进行了内力、变形、基坑隆起状态进行了分析,得到了双排桩基本力学性能。(4)分析了双排桩参数敏感性,讨论了参数最优设计方法。(5)初步分析了强降雨条件下双排桩的力学响应,提出了安全设计的方法。最后,对本论文的研究内容进行了总结,并对今后的研究目标与任务提出了展望。更多还原

【Abstract】 Double-row piles used in the deep pit excavation are a new retaining system. This supporting system has less ground size demand but more brace-effect. Supported by NSFC (grant numbers are 50508012 and 50538030, respectively) and Research Fund for Technology Innovation Talents of Heilongjiang (grant number: 2008RFQXG058) as well as sponsored by Heilongjiang Province Instruction Group, the research activities focused on the mechanical behavior of double-piles in pit supporting system. Based on the previous research, the basic characteristic of double piles-soil interaction is analyzed in this thesis. The process of varying mechanical behavior of double-piles is simulated considering of the complex surrounding load by the commercial software ABAQUS. On the basis of the above work, the special study on the mechanics of double-piles under the condition of heavy rainfall is implemented and some preliminary results are present here. The main works of this research are listed as following:The state-of-the-art technology of double-piles is summarized, some key problems in practice are presented and the importance of finite element method to tackle this kind of difficult calculated questions is shown.The method concerning on selecting the model size is introduced; the advantages and disadvantages of the two and three dimensional simulated models are presented comparing with these models carefully.The force and deformation of soil and piles as well as the deformation of foundation pit bottom and the basic mechanics performance of double-piles is obtained.Sensitive parameters of double-piles are analyzed and the optimal design procedure is discussed.The mechanics performance of piles and soil is simulated under the condition of heavy rainfall and the safe and the propositional design-effect method maybe used in practice.Last but not the end, some conclusions and the prospects in future are given in the final part of the thesis.更多还原