穿越断层隧道地震动力响应敏感性研究
发布时间：2018-09-19 14:17
【摘要】：地震灾害在近几年来发生的较为频繁,原本被广大学者认为具有较好抗震性能的地下结构,在地震中有些发生了破坏,特别是穿越断层破碎带隧道的破坏尤为严重,因此对于寻找出断层隧道地震动力响应因素研究已然迫在眉睫,本文主要在以下几个方面对断层隧道动力响应敏感性进行分析： 1.详细阐述了数值模拟中有关的基本原理,地震波的选取、输入、修正、阻尼的选取、岩土体本构关系及边界条件,对断层隧道动力响应分析的影响。 2.本文采用了正交试验的科学手段解决了多因素共同作用条件下对断层隧道纵向响应长度及断层隧道衬砌结构安全性分析,选用了断层宽度、断层倾角、围岩级别三种因素及三种不同的水平。本次试验应用有限元软件进行隧道地震动力相应分析的模拟,并引入安全系数法对隧道衬砌结构的破坏最为评价标准,最后采用了直观分析法和方差分析法寻找出三种因素对断层隧道的敏感性大小及其响应程度。 3.最后结合酒家垭隧道工程实例进行简要阐述,对酒家垭隧道断层核心段和隧道普通段震害做简要说明,得出在断层破碎带处隧道振动响应强烈,并且对F1和F4断层从响应范围及衬砌破坏的情况做简要分析,其破坏的规律同计算结果相一致,通过工程实例的说明,因此可以得出计算结果的准确性。
[Abstract]:Earthquake disasters occur more frequently in recent years. The underground structures, which were originally considered by the majority of scholars as having better seismic performance, have some damage in the earthquake, especially the damage of tunnels crossing the fault fracture zone. Therefore, it is urgent to find out the seismic dynamic response factors of fault tunnel. In this paper, the sensitivity of dynamic response of fault tunnel is analyzed in the following aspects: 1. The basic principles of numerical simulation, the selection of seismic wave, input, modification, damping selection, constitutive relation of rock and soil and boundary conditions are described in detail, and the influence of seismic wave selection on dynamic response analysis of fault tunnel is discussed. 2. In this paper, the orthogonal test is used to solve the problem of the longitudinal response length of the fault tunnel and the safety analysis of the lining structure of the fault tunnel under the condition of multiple factors acting together. The width of the fault and the angle of fault inclination are selected. Three factors of surrounding rock grade and three different levels. In this experiment, the finite element software is used to simulate the seismic dynamic analysis of the tunnel, and the safety factor method is introduced to evaluate the damage of the tunnel lining structure. Finally, the sensitivity and response of three factors to the fault tunnel are found by using visual analysis method and variance analysis method. Finally, combined with the example of Jiujiaya tunnel project, the earthquake damage of the fault core section and the common section of Jiujiaya tunnel is briefly explained, and the strong vibration response of the tunnel in the fault broken zone is obtained. The failure rules of F1 and F4 faults are consistent with the calculated results, and the accuracy of the calculation results can be obtained through the illustration of engineering examples.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U452.28
本文编号：2250375
[Abstract]:Earthquake disasters occur more frequently in recent years. The underground structures, which were originally considered by the majority of scholars as having better seismic performance, have some damage in the earthquake, especially the damage of tunnels crossing the fault fracture zone. Therefore, it is urgent to find out the seismic dynamic response factors of fault tunnel. In this paper, the sensitivity of dynamic response of fault tunnel is analyzed in the following aspects: 1. The basic principles of numerical simulation, the selection of seismic wave, input, modification, damping selection, constitutive relation of rock and soil and boundary conditions are described in detail, and the influence of seismic wave selection on dynamic response analysis of fault tunnel is discussed. 2. In this paper, the orthogonal test is used to solve the problem of the longitudinal response length of the fault tunnel and the safety analysis of the lining structure of the fault tunnel under the condition of multiple factors acting together. The width of the fault and the angle of fault inclination are selected. Three factors of surrounding rock grade and three different levels. In this experiment, the finite element software is used to simulate the seismic dynamic analysis of the tunnel, and the safety factor method is introduced to evaluate the damage of the tunnel lining structure. Finally, the sensitivity and response of three factors to the fault tunnel are found by using visual analysis method and variance analysis method. Finally, combined with the example of Jiujiaya tunnel project, the earthquake damage of the fault core section and the common section of Jiujiaya tunnel is briefly explained, and the strong vibration response of the tunnel in the fault broken zone is obtained. The failure rules of F1 and F4 faults are consistent with the calculated results, and the accuracy of the calculation results can be obtained through the illustration of engineering examples.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U452.28
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