地下室结构的抗浮设计与分析-结构工程专业论文.docxVIP

地下室结构的抗浮设计与分析 摘要 随着城市建设的发展，土地资源越发紧张，对地下空间的开发利用已逐渐提上日 程，例如地下车库，地下商场的建设。但是建筑物越往深处开发，抗浮问题也伴随而 来，而地下结构因为水浮力造成破坏的事例也不乏少数，所以抗浮问题应该要引起设 计人员的足够重视。目前所采取的抗浮措施大体上分为两类：一类是通过增加覆土厚 度或者地下室底板厚度来压重；另一类是通过布置抗拔桩或者抗浮锚杆来抗拔。不同 的工程应考虑综合因素采用最合适、最经济的抗浮方案。 本论文重点研究在抗浮设计中抗拔桩的群桩效应以及抗拔桩的优化布置，采用通 用有限元软件 MIDAS 进行分析。本论文采用有限元软件进行桩与土的共同作用研究， 在考虑不同桩长、桩数与桩距因素下，抗拔群桩的承载力变化情况以及群桩效应系数 与各因素之间的关系。提出了在布置抗拔桩时，尤其是桩数较多时，一定要通过控制 桩间距来降低群桩效应的结论。对矩形桩与圆形桩进行了分析比较，用有限元软件证 明了矩形桩在承载能力方面的优越性。 本文还研究了抗拔桩在不同布置方案下对地基梁产生的影响，但是要综合考虑桩 在抗拔与承压两种不同情况下地基梁的受力特性，通过工程实例提出了抗拔桩在布置 时的最佳方案。 最后，本论文对抗浮锚杆设计中锚杆的锚固技术、破坏形式、施工工艺、防腐蚀 问题以及锚杆承载力计算等方面进行了论述。并通过工程实例描述了抗浮锚杆的计算 方法和最关键的抗浮验算问题，以期向工程设计人员提供参考。 关键词：抗拔桩；抗浮锚杆；设防水位；群桩效应；有限元分析 Basement Structure Design and Analysis of Anti-floating ABSTRACT With the development of urban construction, land resources becomes more and more nervous, and the development and utilization of underground space has been gradually put on the agenda, such as the underground garage and the construction of the underground mall. With the more deeper development of the buildings , anti-floating has accompanied , and there are some few examples of underground structure because water buoyancy damage, anti-floating problems should cause enough attention of designers. Measures currently taken to solve anti-floating broadly are divided into two categories: one is heavy pressure through increasing thickness of the soil or the basement floor; the other is uplift through arranging uplift pile or anti - floating anchor . Different projects should select the most appropriate and economical anti-float scheme with combination of factors. This paper focus on research in the design of anti-floating pile group effect and optimized arrangement of uplift pile, analyzed by general finite element software MIDAS . This paper researches interaction of pile and soil,using the finite element software.And bearing capacity changes of the the anti-floating pile group and the relationship between pile group effect and various factors when considering diff