装配式预应力鱼腹梁钢结构支撑对深基坑变形的控制技术与方法研究

发布时间：2018-06-26 11:39

本文选题：深基坑 + 装配式预应力鱼腹梁钢结构支撑　；参考：《安徽理工大学》2014年硕士论文

【摘要】：随着城市高层建筑、地铁工程、市政工程以及地下空间开发规模日益增大,基坑工程数量近年来急剧增加。深大基坑开挖及围护结构设计的影响因素甚多,环境保护的难度也越来越大。深基坑工程中常见的内支撑支护形式主要为钢筋混凝土支撑和钢支撑,钢筋混凝土支撑在施工和拆除过程中都将产生严重的环境污染、对原本已脆弱的环境保护产生极其不利影响,传统钢支撑支护体系安全性较差,变形量较大,造价较高。迫于工程界的强烈需求,研发了一种新型钢结构内支撑——装配式预应力鱼腹梁钢结构支撑,此种支护结构能够控制基坑变形及保护周边环境、缩短工期,且能为基坑施工创造较大空间,减少环境污染及实现支护结构构件的循环利用,从而实现高效、绿色环保和节能减排的目的。为了分析此种支护结构对深基坑变形控制作用,本文着重就装配式预应力鱼腹梁钢结构支撑对深基坑变形的控制技术与方法研究作了深入研究,具体内容如下：本文就装配式预应力鱼腹梁钢结构支撑对深基坑变形的控制技术进行研究,先从深基坑变形的自动监测与预警技术切入,引入了有关基坑监测的相关技术；再从深基坑的变形机理着手,给出深基坑变形的预测方法；为了分析该种钢结构支撑控制深基坑变形的规律和特点,采用Midas/GTS数值模拟软件,通过对模拟结果的分析得出支撑内力调整对变形控制的作用效果；针对伺服控制和手动控制两种内力控制方法的比较,表明伺服控制方法对变形的控制效果更及时有效。基于变形控制技术,阐述了深基坑变形控制方法。基于预应力控制变形的理论,阐述了预应力施加与调整的方法。通过确定具体的基坑变形控制指标和控制预案,给出了变形控制的具体措施。最后将本文的研究成果应用于两个工程实例,通过对其变形控制效果的验证与分析,证明本文提出的应用装配式预应力鱼腹梁钢结构支撑控制深基坑变形的技术与方法是有效的,能取得较好的工程效果,具有较高的实际应用价值。
[Abstract]:With the increasing scale of urban high-rise building, subway engineering, municipal engineering and underground space development, the number of foundation pit engineering has increased rapidly in recent years. There are many factors influencing the excavation of deep and large foundation pit and the design of enclosure structure, and the environmental protection is becoming more and more difficult. In deep foundation pit engineering, the common forms of internal support are mainly reinforced concrete support and steel bracing, and the reinforced concrete support will cause serious environmental pollution in the process of construction and demolition. It has an extremely adverse effect on the already fragile environmental protection. The traditional steel bracing system is of poor security, large deformation and high cost. Under the strong demand of the engineering field, a new type of steel structure is developed, which can control the deformation of foundation pit, protect the surrounding environment and shorten the time limit. It can create a large space for foundation pit construction, reduce environmental pollution and realize the recycling of supporting structural components, thus achieving the purpose of high efficiency, green environmental protection and energy saving and emission reduction. In order to analyze the effect of this kind of supporting structure on the deformation control of deep foundation pit, this paper focuses on the deep research on the control technology and method of the steel structure bracing of prestressing prestressed fish-web beam to the deep foundation pit. The main contents are as follows: in this paper, the deformation control technology of deep foundation pit is studied based on the steel structure bracing of prestressing prestressed fish-web beam, and the automatic monitoring and warning technology of deep foundation pit deformation is introduced. In order to analyze the rules and characteristics of this kind of steel structure support controlling deep foundation pit deformation, Midas / GTS numerical simulation software is used to predict the deformation of deep foundation pit, which is based on the deformation mechanism of deep foundation pit. Through the analysis of the simulation results, the effect of adjusting the supporting internal force on the deformation control is obtained, and the comparison between the servo control and manual control shows that the servo control method is more timely and effective for the deformation control. Based on deformation control technology, the deformation control method of deep foundation pit is described. Based on the theory of prestress control deformation, the method of prestress application and adjustment is expounded. Through determining the concrete foundation pit deformation control index and control plan, the concrete measure of deformation control is given. Finally, the research results of this paper are applied to two engineering examples, through the verification and analysis of its deformation control effect, It is proved that the technology and method proposed in this paper to control the deformation of deep foundation pit with the steel structure bracing of prestressing prestress fish-web beam is effective, can obtain better engineering effect and has higher practical application value.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU753

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