文档介绍：河北工程大学
硕士学位论文
双排桩支护结构设计与有限元分析
姓名:南硕
申请学位级别:硕士
专业:岩土工程
指导教师:吴雄志
2011-03
摘要
摘要
双排桩支护结构是一种新型的深基坑支护结构,属于悬臂类空间组合支护结
构,是由两排平行的钢筋混凝土桩以及桩顶的连梁形成的空间门式刚架结构体系。
在没有其他辅助支撑的情况下,它也能够很好的发挥空间门式刚架结构的整体刚
度和空间效应,并与桩、土协同工作,支挡因开挖引起的不平衡力,以达到保持
坑壁或坡体稳定、控制变形、满足施工要求和保持相邻环境安全的目的。双排桩
支护体系适用于周边建筑密集、软土层较厚、高地下水位的基坑工程支护。
目前双排桩支护结构的计算模型已经有多种,但是由于受力较单桩支护结构
复杂,还没有成熟的设计理论。双排桩支护结构在基坑中的应用大部分情况是依
赖实践和经验,应用实例丰富,但是理论研究相对滞后。
本文总结了现有的双排桩支护结构的计算模型,并推导桩间土采取格仓土压
力的新的计算模型。应用有限元软件进行分工况土压力研究对比及分工况双排桩
支护结构的位移、剪力和弯矩的研究。由于门式刚架具有调节受力结构的弯矩和
剪力分布的性能,进一步分析了有无连系梁及连系梁刚度变化是对双排桩支护结
构总体位移、剪力和弯矩的影响。
关键词:;基坑支护;双排桩支护结构;格仓土压力;有限元
I
Abstract
Abstract
Double-row pile retaining and protecting structure is a new type of deep excavation
pit structure, which bined cantilever retaining structure of space, It is Portal
Frames posed of two parallel rows of reinforced concrete pile and beams.
With out any auxiliary supports, it can also be a good use of space portal frame structure,
rigidity and spatial effects, and pile working together with earth retaining the
unbalanced forces caused by excavation to achieve maintaining foundation excavation
or slope stability, control deformation and meet the construction and adjacent
environmental -row piles system is applicable for the foundation
excavation ,which is near the Intensive construction with thick of soft soil layers and
high water level .
Nowdays, Multiple models are used to calculate double-row piles, but the design of
double-row piles is plicated than that of single-row pile. The design theory of
double-row piles is not mature. There are a lot of rich experience in practice, but the
theoretical research is lagging behind .
The author summarizes puting models, and deduce on the basis of soil
pressure for silo puting models. Finite Element Method(FEM) is used to
analysis the change of earth pressure of oundation excavation and the displacement.
shear and moment of double-row piles. The portal fra