软弱夹层对隧道动力可靠性的影响研究

发布时间：2018-09-03 11:34

【摘要】：随着我国交通事业的迅速发展和城市化建设的不断进行,基础性建设在各个领域得到进一步的完善。为更多的节省地面空间,地下工程得到广大学者的广泛关注。作为最主要的地下工程研究对象,隧道的建设数量日益增多,因此合理的隧道支护结构设计方法显得至关重要。本文以可靠性指标来评价结构的稳定性,并就其在隧道衬砌设计的应用进行了如下研究：(1)本文以连续介质模型对隧道衬砌进行可靠性分析,利用ABAQUS软件建立隧道二维平面模型,应用有限元-响应面法进行作用效应分析,确定可靠性分析的功能函数。(2)在不同地震波作用下,对不同位置软弱夹层下的隧道施工过程进行数值模拟,得出不同工况下的衬砌内力、位移等的分布规律。(3)针对无软弱夹层的隧道模型,将围岩弹性模量,抗剪强度,泊松比作为基本随机变量,采用一种通用的可靠指标迭代方法,计算不同围岩参数下的可靠指标,并分析基本变量关于可靠指标的敏感度。(4)针对含软弱夹层的隧道模型,利用通用的可靠指标计算程序,分别研究不同软弱夹层位置下衬砌截面的可靠性变化以及软弱夹层参数变化对衬砌可靠指标的影响,对比分析不同工况下的计算结果。
[Abstract]:With the rapid development of China's transportation industry and the development of urbanization, the basic construction has been further improved in various fields. In order to save more surface space, underground engineering has been widely concerned by many scholars. As the main research object of underground engineering, the number of tunnel construction is increasing day by day, so the reasonable design method of tunnel support structure is very important. In this paper, the reliability index is used to evaluate the stability of the structure, and its application in tunnel lining design is studied as follows: (1) in this paper, the reliability of tunnel lining is analyzed by continuous medium model. The two-dimensional plane model of tunnel is established by using ABAQUS software, and the finite element response surface method is used to analyze the action effect, and the function of reliability analysis is determined. (2) under the action of different seismic waves, Through numerical simulation of the tunnel construction process under different positions of weak intercalation, the distribution of lining internal force and displacement is obtained under different working conditions. (3) for the tunnel model without soft intercalation, the elastic modulus and shear strength of surrounding rock are calculated. As a basic random variable, Poisson's ratio is used to calculate the reliability index under different surrounding rock parameters by using a general reliability index iteration method, and the sensitivity of the basic variable to the reliability index is analyzed. (4) for the tunnel model with weak intercalation, The reliability change of lining cross-section and the influence of soft intercalation parameters on the reliability index of lining are studied by using the general calculation program of reliability index, and the calculation results under different working conditions are compared and analyzed.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U451

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