圆形断面地下结构拟静力抗震计算边界问题研究

发布时间：2018-03-21 10:34

本文选题：圆形断面地下结构　切入点：地基弹簧刚度　出处：《西南交通大学》2017年硕士论文　论文类型：学位论文

【摘要】：我国经济现处于高速增长阶段,借鉴国内及其他发达国家在地下结构抗震领域的科研成果,我们对地下结构的抗震设计不断提出更高的要求。因此,发展有效的地下结构抗震分析方法,完善我国地下结构抗震设计体系,具有重要的科学意义和工程应用价值。本文主要对圆形断面地下结构反应位移法横向抗震计算中包含多个自变量的法向和切向地层弹簧刚度数学表达式进行了拟合。分析了多工况下地层-结构模型反应位移法和反应加速度法模型边界宽度合理取值,最后依托厦门轨道交通2号线一期工程对动力时程法和三种拟静力方法进行了对比分析。论文主要工作如下:(1)分析了圆形断面地下结构地基弹簧刚度取值的影响因素,利用有限元计算方法计算出大量工况下地基弹簧刚度取值,根据对各影响因素敏感度分析建立了适用于反应位移法横向抗震计算的法向和切向地基弹簧刚度的计算公式,并对公式的系数进行了拟合,最后对提出的公式进行了验证;(2)以动力时程分析方法计算结果为基准,研究不同埋深、不同地震波加速度峰值和不同围岩等级下地层-结构模型反应位移法计算模型边界宽度合理取值;(3)以动力时程分析方法计算结果为基准,研究不同埋深、不同地震波加速度峰值和不同围岩等级下反应加速度法计算模型边界宽度合理取值;(4)依托厦门市轨道交通2号线一期工程,根据文章中对各拟静力抗震计算方法边界问题的研究结论,采用动力时程法、反应位移法、地层-结构模型反应位移法、反应加速度法四种方法对隧道进行抗震计算分析,将各种拟静力计算结果与动力时程分析结果进行对比分析,验证提出结论的适用性。
[Abstract]:The economy of our country is now in the stage of rapid growth. Drawing on the scientific research achievements of domestic and other developed countries in the field of earthquake resistance of underground structures, we constantly put forward higher requirements for seismic design of underground structures. To develop an effective seismic analysis method for underground structures and improve the seismic design system of underground structures in China, It is of great scientific significance and engineering application value. In this paper, the mathematical expressions of spring stiffness in normal and tangential strata with multiple independent variables in lateral seismic calculation of circular underground structures with response displacement method are simulated. In this paper, the boundary width of the stratigraphic-structure model and the reaction acceleration method are analyzed. Finally, based on the first stage project of Xiamen Rail Transit Line 2, the dynamic time-log method and three pseudo-static methods are compared and analyzed. The main work of this paper is as follows: 1) analyzing the influence factors of spring stiffness of circular underground structure foundation. In this paper, the stiffness of spring is calculated by finite element method under a large number of working conditions. According to the sensitivity analysis of various factors, the formulas of spring stiffness in normal direction and tangential direction are established, which are suitable for lateral seismic calculation of response displacement method. The coefficients of the formula are fitted. Finally, the formula proposed is verified. (2) based on the results of dynamic time history analysis, the different buried depths are studied. Different seismic wave acceleration peaks and different surrounding rock classes are used to calculate the boundary width of the model by using the response displacement method of stratigraphic-structure model. The results of dynamic time history analysis are taken as the basis for the study of different buried depths. The boundary width of the model calculated by the response acceleration method under different seismic wave acceleration peaks and different surrounding rock classes is reasonably chosen. The method relies on the first phase of Xiamen Rail Transit Line 2, the first stage of which is based on the first stage of Xiamen Rail Transit Line 2. According to the research results of boundary problems of quasi-static seismic calculation methods in this paper, the dynamic time-process method, the response displacement method, the stratum structure model response displacement method and the reactive acceleration method are used to calculate and analyze the earthquake resistance of the tunnel. The results of quasi-static calculation and dynamic time history analysis are compared to verify the applicability of the proposed conclusions.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU93

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