基坑开挖对邻近建筑物的影响及其支护结构参数优化研究

发布时间：2018-05-28 17:44

本文选题：基坑工程 + 邻近建筑物　；参考：《东北大学》2013年硕士论文

【摘要】：伴随着我国经济的迅速发展,城市化带来了规模庞大的工程建设。在城市环境变得越来越复杂的同时,深基坑工程受到了人们越来越多的关注和重视。在深基坑工程施工中,对邻近建筑物的影响变得越来越不可忽视,这关系到工程质量,经济和安全。为了保证邻近深基坑建筑物的安全,同时确保深基坑工程顺利施工,本文着重研究了邻近深基坑建筑物的变形规律,而深基坑施工对邻近建筑物的影响主要体现在沉降和由沉降导致的倾斜上,因此笔者重点研究了邻近建筑物的沉降规律。本文深基坑工程支护方式采用桩锚支护,桩锚支护也以其工程适应性强等优点,成为了沈阳地区基坑工程中广泛应用的支护结构体系。但是在基坑工程设计中,存在着两种极端的现象：一是由于设计盲目减小参数而潜在工程安全隐患,甚至诱发工程事故,特别是引起邻近建筑物、道路以及水、电、煤气管网等生命线工程的破坏,造成重大经济损失；二是支护选型和设计极为保守,造成不必要的浪费。为了寻求既经济又安全的支护方案,采用正交试验结合数值模拟的方法,对深基坑支护结构参数进行优化,以期对实际工程设计和施工起到一定的参考作用。本文以沈阳中海寰宇基坑施工项目为依托,主要研究内容及相关成果如下：依据项目实测数据,采用图表方法分析得出桩顶水平位移、桩顶沉降的变形规律、周边地表沉降规律：并结合数值模拟分析方法,得出了沈阳地区(砂土)邻近深基坑建筑物的沉降规律；采用等值梁法和正弦定理对深基坑工程的桩长,桩嵌固深度,锚杆长度,锚杆锚固长度进行计算,与基坑设计参数对比发现,支护结构参数存在优化的可能性和必要性；采用正交试验和数值模拟相结合的方法,依据工程设计参数,以邻近建筑物沉降值作为评价指标,对深基坑工程的支护结构参数进行了优化。
[Abstract]:With the rapid development of China's economy, urbanization has brought a large scale of engineering construction. As the urban environment becomes more and more complex, people pay more and more attention to deep foundation pit engineering. In the construction of deep foundation pit, the influence on the adjacent buildings becomes more and more important, which is related to the quality, economy and safety of the project. In order to ensure the safety of the adjacent deep foundation pit buildings and ensure the smooth construction of the deep foundation pit engineering, the deformation law of the adjacent deep foundation pit buildings is studied in this paper. The influence of deep foundation pit construction on the adjacent buildings is mainly reflected in the settlement and the inclination caused by the settlement, so the author focuses on the settlement law of the adjacent buildings. In this paper, pile-anchor support is adopted in deep foundation pit engineering, and pile-anchor support is widely used in foundation pit engineering in Shenyang area because of its strong engineering adaptability and so on. However, in the design of foundation pit, there are two extreme phenomena: one is the potential hidden danger of engineering safety due to blind reduction of design parameters, and even cause engineering accidents, especially the adjacent buildings, roads, water and electricity. The destruction of lifeline engineering such as gas pipe network causes great economic loss, and second, the type selection and design of support are extremely conservative, resulting in unnecessary waste. In order to find an economical and safe support scheme, orthogonal test combined with numerical simulation is used to optimize the parameters of deep foundation pit support structure, which is expected to play a certain reference role in practical engineering design and construction. Based on Shenyang Zhonghai Global Foundation Pit Construction Project, the main research contents and related results are as follows: according to the measured data of the project, the horizontal displacement of pile top and the deformation law of pile top settlement are obtained by using chart method. The settlement law of surrounding ground surface: combined with numerical simulation and analysis method, the settlement law of adjacent deep foundation pit buildings in Shenyang area (sand soil) is obtained, and the pile length and embedded depth of deep foundation pit engineering are studied by using equivalent beam method and sinusoidal theorem. Comparing with the design parameters of foundation pit, it is found that it is possible and necessary to optimize the parameters of supporting structure, and the method of combining orthogonal test and numerical simulation is used to calculate the length of anchor and anchor length of anchor, according to the engineering design parameters, Taking the settlement value of adjacent buildings as the evaluation index, the parameters of support structure of deep foundation pit engineering are optimized.
【学位授予单位】：东北大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU753

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