基于实测数据的盾构隧道环境影响分析方法研究

发布时间：2018-02-14 14:53

本文关键词： 盾构隧道环境影响多目标土体参数　出处：《上海交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：盾构法施工在隧道工程中有着广泛的推广和应用。随着施工技术的不断成熟,盾构隧道开始向大直径、长距离、复杂施工环境发展。在城市中心等复杂环境新建隧道,往往不可避免的要在既有地下结构或基础工程附近穿越施工。复杂建设环境对隧道工程施工提出了微扰动变形的控制要求,为保证既有结构的运营安全和正常使用,必须对新建隧道环境影响进行准确的评估分析,从而在施工过程中实现微扰动的控制要求。土体参数作为分析环境影响的重要参数,具有很强的离散性和变异性,能否获得准确的土体参数会直接影响分析的精确度。为了有效控制施工环境影响,降低施工风险,需要准确的获得地层物理力学参数,进而对工程进行风险分析和预测,提出有效的控制措施。本文结合有限元数值模拟,提出了一种基于实测数据得到准确土体参数的方法,以及一种有限元模型简化方法,并成功运用于实际工程中。本文主要工作内容与研究成果如下:(1)针对隧道施工,通过参数反分析方法来分析隧道施工对周围环境的影响。结合有限元计算软件,在前人的基础上,开发了适用于隧道工程施工的参数反分析算法,提出有效的反分析迭代方法及收敛标准。(2)借鉴多目标优化中的Pareto最优理论,结合多种遗传进化算法,提出一种更高效且准确的多目标参数反分析方法并利用该方法和数值模拟软件结合起来,用于分析隧道周围土体参数。通过同时考虑地面沉降和土体侧移、地面沉降和超孔压分布等,作为两个目标函数进行多目标参数分析,以及通过对两个目标所得结果同单目标分析所得结果的比较,肯定了多目标分析的准确性和可行性,实现该方法的实际应用。(3)针对参数分析迭代计算量大的特点,为实现高效率参数分析,提出一种隧道二维平面模型的简化方法,避免三维模型耗时长的不足,提高基于实测数据的参数分析方法应用于实际工程的实用性。
[Abstract]:Shield tunneling is widely used in tunnel engineering. With the development of construction technology, shield tunnel begins to develop into large diameter, long distance and complex construction environment. New tunnel is built in complex environment, such as city center, etc. In order to ensure the operation safety and normal use of the existing structures, the complex construction environment has put forward the control requirements of micro-disturbance deformation for the tunnel construction. It is necessary to accurately evaluate and analyze the environmental impact of the newly built tunnel so as to meet the control requirements of micro-disturbance in the construction process. As an important parameter in analyzing the environmental impact, soil parameters have strong discreteness and variability. Whether the accurate soil parameters can be obtained will directly affect the accuracy of the analysis. In order to effectively control the environmental impact of construction and reduce the construction risk, it is necessary to accurately obtain the physical and mechanical parameters of the strata, and then carry out risk analysis and prediction of the project. In this paper, a method of getting accurate soil parameters based on measured data and a simplified method of finite element model are proposed, which are combined with finite element numerical simulation. The main contents and research results of this paper are as follows: 1) aiming at tunnel construction, the influence of tunnel construction on the surrounding environment is analyzed by means of parameter back analysis method, and the finite element calculation software is used to analyze the influence of tunnel construction on the surrounding environment. On the basis of previous researches, a parameter back analysis algorithm suitable for tunnel construction is developed, and an effective inverse analysis iteration method and convergence criterion are proposed. The Pareto optimal theory in multi-objective optimization is used for reference, and a variety of genetic evolution algorithms are combined. A more efficient and accurate method for back analysis of multi-objective parameters is proposed. The method is combined with numerical simulation software to analyze the soil parameters around the tunnel. As two objective functions, the land subsidence and the distribution of superpore pressure are analyzed by multi-objective parameter analysis, and the accuracy and feasibility of the multi-objective analysis are confirmed by comparing the results obtained from the two objectives with the results obtained from the single-objective analysis. The practical application of this method. (3) aiming at the characteristic of large iterative calculation of parameter analysis, a simplified method of two-dimensional plane model of tunnel is proposed to realize high efficiency parameter analysis, which avoids the shortage of long time consuming in 3D model. The practical application of parameter analysis method based on measured data in practical engineering is improved.
【学位授予单位】：上海交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.43

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