隧道施工地层变形与地表建筑物的动态相互作用研究

发布时间：2018-06-15 06:26

本文选题：隧道施工 + 穿越工程　；参考：《北京交通大学》2017年硕士论文

【摘要】：随着时代的发展和城市化进程的加速,国内诸多城市兴起修建地铁的热潮。城市地区建筑物密集,而进行地铁施工不可避免会对周边地表建筑物造成影响,甚至会使得建筑物发生严重破坏,丧失使用功能。隧道穿越建筑物施工过程中,核心问题是隧道-土体-建筑物的动态相互作用关系,研究三者之间的动态相互作用机理,分析其动态相互作用过程,对保护地表建筑物、确保施工全过程的安全性具有重要意义。本文采取随机介质理论、颗粒流分析、有限元分析等方法并结合工程案例,分析了隧道施工影响下隧道-地层-建筑物的动态相互作用关系。主要工作和研究成果如下:(1)基于随机介质理论,编制MATLAB计算程序,分别计算了单线隧道与双线隧道开挖作用下,考虑隧道埋深、开挖断面大小、施工过程等不同影响因素对地表沉降变形规律的影响。采用PFC2D颗粒流分析软件,分别建立有无地表建筑物存在时的颗粒流模型,从宏观细观相结合的角度分析隧道开挖影响下隧道-地层-建筑物动态作用关系。分析认为,隧道开挖地层变形是从隧洞周边逐渐扩散至地表的,建筑物的存在使得相互作用关系更为复杂。(2)采用有限元分析软件ABAQUS,建立隧道-地层-建筑物相互作用的二维模型,建筑物与土体之间采用接触连接模型,分析隧道开挖作用下三者之间的相互作用,并与没有地表建筑物存在的情况相比较,分析相互作用关系的异同。考虑不同的穿越关系,建筑物与地层之间在隧道埋深较浅的条件下会发生离层,采用接触模型分析三者之间的相互作用关系更为准确。(3)采用有限元分析软件ABAQUS,建立隧道-地层-建筑物相互作用三维分析模型,分析不同工况下三者的相互作用关系,主要包括地质参数、隧道穿越角度以及双线隧道的不同开挖顺序。分析表明,隧道-地层-建筑物的动态作用关系体现在时空维度,不同开挖步序对建筑物位移内力造成不同的影响。(4)结合厦门机场路浅埋大跨隧道穿越密集建筑群工程实例,分析隧道施工中建筑物变形情况,主要分析了浅埋大跨进口段34号楼的动态变形过程,并对在实际工程施工中采取的控制地层沉降和建筑物保护措施进行了分析,指出隧道施工是极其复杂的过程,影响因素众多,需要确定主要影响因素并采取适当的控制措施。
[Abstract]:With the development of the times and the acceleration of urbanization, many cities in our country are building subway. Buildings are dense in urban areas, and subway construction will inevitably affect the surrounding surface buildings, and even make the buildings seriously damaged and lose their function. In the construction process of tunneling through buildings, the key problem is the dynamic interaction between tunnel, soil and buildings. The dynamic interaction mechanism between them is studied, and the dynamic interaction process is analyzed to protect the surface buildings. It is of great significance to ensure the safety of the whole construction process. In this paper, the stochastic medium theory, particle flow analysis, finite element analysis and engineering cases are used to analyze the dynamic interaction between tunnel, stratum and building under the influence of tunnel construction. The main work and research results are as follows: (1) based on the stochastic medium theory, the MATLAB calculation program is compiled to calculate the excavation depth and section size of the tunnel under the action of single-line tunnel and double-line tunnel respectively. The influence of different factors such as construction process on the law of ground subsidence and deformation. In this paper, PFC2D particle flow analysis software is used to establish particle flow models with or without the existence of surface buildings. The dynamic relationship between tunnel, stratum and building under the influence of tunnel excavation is analyzed from the point of view of macroscopic and mesoscopic analysis. The analysis shows that the deformation of the tunnel is gradually diffused from the surrounding tunnel to the surface. The existence of buildings makes the interaction relationship more complex. (2) the finite element analysis software Abaqus is used to establish a two-dimensional model of the tunnel-soil-building interaction, and the contact connection model between the building and the soil is adopted. This paper analyzes the interaction between the three factors under the action of tunnel excavation, and compares with the situation that there is no surface building, and analyzes the similarities and differences of the interaction relationship. Considering different traversing relationships, there will be separation between the buildings and the strata under the condition of the shallow depth of the tunnel. The contact model is used to analyze the interaction between the three factors more accurately. The finite element analysis software Abaqus is used to establish the three-dimensional analysis model of tunnel-stratification and building interaction, and to analyze the interaction relationship between them under different working conditions. It mainly includes geological parameters, tunnel crossing angle and different excavation sequence of double-line tunnel. The analysis shows that the dynamic action relationship of tunnel, stratum and building is embodied in the dimension of time and space, and the different excavation steps have different influence on the internal force of the displacement of the building. 4) combined with the engineering example of Xiamen Airport Road shallow buried large span tunnel crossing through the dense building group. This paper analyzes the deformation of buildings in tunnel construction, mainly analyzes the dynamic deformation process of building No. 34 in the entrance section of shallow buried large span, and analyzes the measures taken to control ground subsidence and protect buildings in actual engineering construction. It is pointed out that tunnel construction is an extremely complex process, and there are many influencing factors, so it is necessary to determine the main influencing factors and take appropriate control measures.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U456

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