基坑支护毕业设计计算书

发布于:2021-10-14 10:14:37

基坑支护毕业设计 计算书 1 2020 年 4 月 19 日 文档仅供参考 摘要 该工程位于中部*原地区,地势相对较为*坦,除上层杂填 土外,下层为成层粉土、淤泥质土及粘性土,周边有城市道路和 已建居民楼和综合性办公楼。地下水较为丰富,其中粉土层和淤 泥质土层透水性较好,因此必须采取竖向止水。结合周边环境并 参考以往施工案例,本设计采用了两种支护结构形式,首先是基 坑南北两侧距离用地红线较远,故采用桩锚支护,即单排桩+单 层锚钉支护;东西两侧由于场地的局限性,采用双排桩支护。止 水帷幕采用深层搅拌水泥土法,深层搅拌水泥土桩在相邻两支护 桩的中间,与支护桩相互衔接 200mm 形成密封止水桩墙,既起 到止水的作用,又增强支护桩的支护能力。 本设计基坑重要性等级根据基坑开挖深度和重要性定为二 级,各段基坑支护设计都本着安全、经济、合理的原则严格按照 相关规范的要求进行。本设计对基坑支护做了详细的计算和说 明,主要内容包括:工程概况的描述、基坑支护方案的对比与确 定、基坑降水方式的确定、基坑涌水量计算、基坑降水*面图设 计、止水帷幕的设计与计算、基坑支护结构设计与计算(包括支 护桩长的计算、桩身最大弯矩的计算、锚钉支锚力的计算、锚钉 2020 年 4 月 19 日 文档仅供参考 长度的计算以及支护桩配筋计算)、基坑稳定性验算、基坑施工 监测等。其中大部分计算过程经过手算完成,基坑稳定性验算部 分借助理正深基坑软件完成。 关键词:深基坑;桩锚支护;基坑稳定性;止水帷幕;基坑降水 I 2020 年 4 月 19 日 文档仅供参考 Abstract The project is located in the middle of plains areas. The terrain is relatively flat. Except for the upper miscellaneous fill, the lower mostly layered silt, silty soil and clay soil. The foundation pit surrounded by urban roads and buildings that have been built. The area is rich in groundwater and the water permeability of silt and mucky soil is better. So it is necessary to use the vertical waterproof curtain. The design uses two forms of support structure combined with the surrounding environment and with reference to other construction cases. The north and south sides of the foundation pit is far away from the red line. So the Pile - anchor Support is used that is single row pile single tag anchor support; Due to the limitations of space, double row piles support is used on east and west sides. Eement deep mixing method is used to develop waterproof curtain. It plays a role in waterstop, but also enhance the support capability of support piles when the deep mixing cement piles link in the middle of two adjacent soldier piles 200mm which forming a sealed seal waterstop. 2020 年 4 月 19 日 文档仅供参考 According to excavation pit depth and importance the level of importance of the designis a secondary. Each segment of the excavation design are strict accordance with the requirements of the relevant norms develop in a safe, economical and reasonable principle. The design made a detailed calculation and explanation about the foundation pit, the main contents include: a description of the project overview , scheme comparison and selection of the Foundation Pit Support , determining of Foundation Pit Dewatering Methods, calculation of foundation inflow, the design of Foundation Pit precipitation plan view , design and calculation of waterproof curtain, the design and calculations of Foundati

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