地鐵盾構(gòu)施工地面沉降風(fēng)險(xiǎn)分析
[Abstract]:In view of the complexity of subway engineering, accidents are easy to occur in the construction process, including ground collapse caused by serious land subsidence, damage to adjacent buildings and pipelines, and so on. The subway construction inevitably brings about the land subsidence, and the serious ground subsidence has great harmfulness. Therefore, the risk management of the ground settlement in the subway shield construction is helpful to prevent and avoid the serious land subsidence in the construction process. It has important practical value to reduce property loss and safety risk. In this paper, firstly, many literatures about ground subsidence in shield construction of subway are reviewed, and the factors affecting ground subsidence in shield construction of subway are summarized. In this paper, the ground subsidence is divided into "safety" and "serious ground subsidence", and dynamic fault tree is used to establish the risk assessment model of ground subsidence in shield construction of subway, and then modularize the model and solve it, so that the risk probability can be solved. Then the paper analyzes the sensitivity of the influencing factors in order to identify the key factors. Through the analysis of the paper, it can be concluded that the factors affecting the ground subsidence in shield tunneling construction are not independent of each other, but will affect each other. In order to consider the interaction between the factors, the global sensitivity analysis method based on EFAST is selected to analyze the sensitivity of the influence factors of land subsidence. Finally, the dynamic fault tree is used to predict the risk of ground subsidence in shield tunneling, and the key factors of land subsidence are found through the global sensitivity analysis based on EFAST. The results show that, with the extension of construction time, the risk of serious land subsidence increases gradually, and the tunnel design parameters have the greatest influence on the land subsidence, followed by the soil parameters. The results are in line with the engineering practice, which shows the feasibility of the method selected in this paper in the analysis of the ground subsidence risk in the shield tunneling construction of subway. In this paper, the dynamic fault tree is used to predict the risk of ground subsidence in shield construction of subway and the global sensitivity analysis based on EFAST is used to identify the key factors, which provides a new idea for the study of risk management of ground subsidence in shield construction of subway.
【學(xué)位授予單位】:華中科技大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類號(hào)】:U231.3;U455.43
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