深基坑桩锚支护结构的机理分析及工程应用

发布时间：2018-01-14 23:24

本文关键词：深基坑桩锚支护结构的机理分析及工程应用　出处：《安徽理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：深基坑工程是一项综合性很强的系统工程,它主要由土方开挖和基坑支护组成。土方开挖是指在红线内地表以下开挖的地下空间,而深基坑支护是临时性防护,它是为了确保土方开挖,基础能够顺利施工,对基坑边缘和周围环境使用的支挡、固定的保护措施。所以深基坑支护最重要的作用就是确保基坑的安全稳定,还要有效的防护基坑周边土体沉降以及减少周围环境的破坏。基坑工程受地域性影响很大,不同的水文地质条件下,基坑之间的差异也很大。而本文是以淮南市山南新区钻石星座项目收集的基坑支护资料为基础,根据相关文献和规范,结合所学理论知识、工地现场实习和库伦GE05软件对桩锚支护结构进行了较系统,深入的对比分析。论文正文部分包括:1.对工程基本概况及数据资料的分析,选取排桩加锚杆的基坑支护方式。2.论述深基坑桩锚支护的施工工艺、力学理论分析及基坑监测方案。3.通过库伦GE05软件把深基坑开挖及支护分成不同的工况进行数值模拟,深入分析不同的开挖深度对支护桩的偏移和桩身的内力影响。并对模拟结果作对比,得出结论。4.通过软件模拟并分析对比支护桩的桩径、桩间距、锚杆间距、锚杆预应力大小因素对桩锚支护结构的影响,并提出合理建议。当其它影响因素不改变的情况下,只改变一种影响因素,通过库伦GE05软件模拟分析对比得出:1)随着支护桩桩径的增加,桩身的位移逐渐减小,但这种减小的趋势慢慢变缓,而支护桩受到的弯矩却在逐渐变大。2)随着支护桩间距的减小,桩身位移也在减小,但当桩间距过大时,会引起支护桩瞬间产生严重位移,造成事故。3)随着锚杆间距的减小,在一定范围内虽然桩体中间的侧移在逐渐减小,但桩顶的位移却越来越大,支护桩桩体最大位移值由桩体中间改变到桩顶。4)随着锚杆施加预应力的增加,支护桩的桩身位移和桩体受到的弯矩都会有所减小,但支护桩桩顶的位移却逐渐增大。因此,在实际工程中,即要保证基坑的绝对安全情况下,也要兼顾到经济性,选取适宜的参数。
[Abstract]:Deep foundation pit engineering is a comprehensive system engineering, it is mainly composed of earthwork excavation and foundation pit support. Earthwork excavation refers to the underground space excavated below the red line, while deep foundation pit support is temporary protection. It is to ensure that earthwork excavation, foundation can be successfully constructed, the edge of the foundation pit and the surrounding environment, fixed protection measures, so the most important role of deep foundation pit support is to ensure the safety and stability of foundation pit. It also effectively protects the settlement of soil around the foundation pit and reduces the damage to the surrounding environment. The foundation pit engineering is greatly affected by regional, under different hydrogeological conditions. The difference between the foundation pit is also very big. And this article is based on the foundation pit support data collected by the Diamond constellation Project of Huainan Shannan New District, according to the relevant literature and norms, combined with the theoretical knowledge learned. Site practice and Coulomb GE05 software to the pile-anchor support structure for a more systematic, in-depth comparative analysis. The main body of the paper includes: 1. The basic situation of the project and the analysis of data. Selecting the supporting method of foundation pit with row pile and anchor rod. 2. Discuss the construction technology of pile anchor support in deep foundation pit. Mechanical theory analysis and foundation pit monitoring scheme .3.The deep foundation pit excavation and support are divided into different working conditions for numerical simulation through Coulomb GE05 software. Deeply analyze the influence of different excavation depth on the displacement of supporting pile and the internal force of pile body, and compare the results of simulation, draw conclusion .4.Through software simulation and analysis of pile diameter, pile spacing. The influence of the factors of anchor spacing and pre-stress on the pile-anchor supporting structure is put forward. When the other influencing factors are not changed, only one kind of influence factor is changed. Through the simulation analysis of Coulomb GE05 software, it is concluded that: 1) with the increase of the diameter of the supporting pile, the displacement of the pile body decreases gradually, but the decreasing trend slowly becomes slower. However, the bending moment of the supporting pile is gradually increasing. 2) with the decrease of the spacing of the supporting pile, the displacement of the pile body is also decreasing, but when the distance between the piles is too large, it will cause the serious displacement of the supporting pile instantly. Accident. 3) with the decrease of anchor spacing, the displacement of the top of the pile becomes larger and larger in a certain range, although the lateral displacement of the middle part of the pile gradually decreases. The maximum displacement of the supporting pile is changed from the middle of the pile to the top of the pile. However, the displacement of the supporting pile roof is gradually increasing. Therefore, in the practical engineering, in order to ensure the absolute safety of the foundation pit, the economy should also be taken into account, and the appropriate parameters should be selected.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU753

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