文档介绍：The analysis of deep foundation about pile anchor
retaining structure based on FLAC3D
Major:Geotechnical Engineering
Direction of Study:Foundation and
Foundation Engineering
Graduate Student: Huang ChuangJie
Supervisor: Professor Wang JieGuang
College of Civil Engineering and Architecture
Guilin University of Technology
February, 2013 to April, 2014
万方数据
I
万方数据
摘要
随着经济和社会的发展,高层、超高层建筑以及地下铁道工程大量出现,深基坑工
程也随之大量出现。深基坑工程是一项综合性很强而且复杂的系统工程,其支护方式有
多种。桩锚支护结构是深基坑支护常见的一种,由于其具有造价低、施工方便、适用范
围广等优点而被推广。
本文以深圳某大厦深基坑钻孔灌注桩预应力锚杆支护工程实例为背景,采用有限差
分软件 FLAD3D 创建模型,对基坑开挖过程中土体和支护结构的变形进行模拟,并与
现场监测数据进行对比分析,得出一些有益的结论。
本文主要得出了以下结论:
(1)FLAC3D 数值模拟方法对基坑施工工况进行的动态模拟是合理有效的,模拟
的结果接近于工程实际的情况。
(2)支护桩桩顶水平位移随着土方的开挖总体呈增大的趋势。预应力锚索的施加
对于约束桩顶部水平位移发展的效果是显著的。
(3)深层土体水平位移随着基坑开挖而增大,可用深层土体水平位移的影响范围
来判断支护桩的长度是否合理。
(4)预应力锚索锁定后短时间内会出现少量预应力损失。下一道锚索的施加会使
上一道锚索轴力减小,这是因为下一道锚索协助上一道锚索分担了部分土压力。锚索轴
力随桩体的侧移的增大而呈现增长的趋势。
(5)预应力锚索在土体中主要起受拉作用,表现为自由段轴力基本不变,锚固段
轴力向尾部呈衰减趋势。锚索轴力的变化主要是由于土体滑动产生了相对位移变化引起
的,另外,下层锚索的施加也会改变上层锚索的受力状态。
(6)监测点土体的深层水平位移实测结果与数值模拟下的最大水平位移区域进行
对比,结果大致吻合,表明整个支护结构为支护深基坑稳定、约束变形发挥了重要作用。
关键词:深基坑支护,FLAC3D 模拟,桩锚支护,预应力锚索
II
万方数据
Abstract
With the development of economy and society,High-rise building and subway project
come out in large numbers, Deep Excavation also will be large numbers. Deep excavation is a
prehensive plex systems engineering, Its support have various ways. Pile
anchor retaining structure is one mon of deep foundation pit, because of its low cost,
easy construction, a wide range of advantages being promoted.
This article take an engineering examples which is Shenzhen a big summer of bored
prestressed bolting deep foundation as the background, use the finite difference software
FLAD3D create models, turkey deformation during excavation and supporting structure body
to simulate, and analyze with the on-site monitoring data , and draw some useful
conclusions.
This article draw the following conclusions:
(1)FLAC3D