基于BIM的深基坑桩锚支护结构优化设计及稳定性分析

发布时间：2018-10-17 11:36

【摘要】：深基坑工程是一个综合性很强的岩土工程问题,在其开挖支护的过程中既要保证基坑正常安全作业,又要防止支护结构及坑外土体位移过大,保证基坑周围建筑物、道路、市政管线等不被破坏。对深基坑工程支护方案的设计优化是保证基坑工程施工开挖顺利进行的重要手段。同时,随着我国计算机技术的不断发展,BIM技术及数值模拟技术被应用到深基坑工程中,并发挥了重要作用,解决了许多工程问题。本文以长沙贺龙城市生活广场深基坑工程为研究背景,采用BIM软件Revit、Navisworks以及深基坑设计分析软件对该深基坑工程初始设计方案进行优化与验算分析。最后利用Plaxis有限元软件对优化后的支护结构体系进行数值模拟分析。主要工作包括:(1)利用BIM建模软件Revit对基坑支护结构体系建模,然后用Navisworks对支护模型进行碰撞检查,检查初始设计中存在的问题并初步对其进行优化。(2)用理正深基坑软件对BIM优化后的方案进行深化设计,对优化方案的支护结构水平位移和周边地面沉降进行分析,然后验证其整体稳定性、抗倾覆稳定性以及抗隆起稳定性。(3)通过Plaxis2D分别对优化方案与初始方案进行分步开挖数值模拟,对基坑开挖过程中土体变形、支护桩桩身水平位移以及桩身弯矩情况进行分析,探讨了随基坑开挖深度的不断加深,围护桩水平位移以及地表沉降的变化规律。(4)将初始方案与优化方案数值模拟结果进行对比,证明优化方案的有效性。同时,对坡顶水平位移、沉降、深层水平位移监测数据进行分析,并与优化方案的Plaxis2D数值模拟结果作对比分析,来验证所优化方案的可行性,来保证基坑施工开挖过程的安全性。本文的研究是BIM技术及数值模拟技术理论和实践的结合,对深基坑工程的设计及施工具有十分重要的指导意义。
[Abstract]:Deep foundation pit engineering is a very comprehensive geotechnical engineering problem. In the process of excavation and support, it is necessary to ensure the normal and safe operation of foundation pit, and to prevent the support structure and soil displacement outside the pit from being too large, so as to ensure the buildings and roads around the foundation pit. Municipal pipelines and so on will not be damaged. The design optimization of support scheme for deep foundation pit engineering is an important means to ensure the smooth construction and excavation of foundation pit engineering. At the same time, with the continuous development of computer technology in China, BIM technology and numerical simulation technology have been applied to deep foundation pit engineering, and played an important role in solving many engineering problems. This paper takes the deep foundation pit project of He Long city life square in Changsha as the research background, using BIM software Revit,Navisworks and deep foundation pit design analysis software to optimize and check the initial design scheme of the deep foundation pit project. Finally, Plaxis finite element software is used to simulate and analyze the optimized support structure system. The main work includes: (1) using BIM modeling software Revit to model the foundation pit supporting structure system, and then using Navisworks to carry out collision inspection to the supporting model. Check the existing problems in the initial design and optimize it. (2) using the software of Lizheng deep foundation pit to deepen the design of the optimized scheme of BIM, and analyze the horizontal displacement of the supporting structure and the surrounding ground settlement of the optimized scheme. Then verify its overall stability, anti-overturning stability and anti-uplift stability. (3) numerical simulation of the optimization scheme and the initial scheme are carried out by Plaxis2D, and the deformation of soil in the excavation process of foundation pit is simulated. The horizontal displacement and bending moment of the supporting pile body are analyzed, and it is discussed that with the deepening of the excavation depth of the foundation pit, (4) comparing the results of numerical simulation between the initial scheme and the optimization scheme to prove the effectiveness of the optimization scheme. At the same time, the monitoring data of horizontal displacement, settlement and deep horizontal displacement of slope top are analyzed and compared with the results of Plaxis2D numerical simulation of the optimized scheme to verify the feasibility of the optimized scheme. To ensure the safety of foundation pit construction and excavation process. The research of this paper is a combination of BIM technology and numerical simulation technology, and it has a very important guiding significance for the design and construction of deep foundation pit engineering.
【学位授予单位】：湘潭大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU473;TU17

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