饱和砂土地层盾构隧道的地震动力响应分析
发布时间：2018-08-21 14:05
【摘要】：随着社会经济的持续高速发展,城市化进程的持续加快,盾构隧道已经成为现在城市地铁隧道主要形式。为了分析饱和砂土地层中盾构隧道在的地震作用下的动力响应,本文在总结国内外盾构隧道抗震分析方法研究现状基础上,采用理论分析和数值模拟等方法,对强震作用下饱和砂土地层中盾构隧道动力响应开展了如下研究： (1)对课题研究的意义、盾构隧道地震响应特征、盾构隧道地震响应分析方法进行了综述,并阐述了地震动作用下饱和砂土地层盾构隧道动力效应理论。 (2)进行了在正弦波作用下饱和砂土地层的地震动力反应数值模拟,对正弦地震波振幅、频率、地震持续时间对饱和地层中盾构隧道动力响应进行了分析。 (3)在分析饱和砂土孔压类型及其动力效应的基础之上,阐述了作用于衬砌上的动孔压效应。通过对不同初始地下水位下盾构隧道地震数值模拟,分析了管片衬砌孔隙水压力波动以及单元应力波动的特点,获得了孔隙水压力最大波动值、最大加速度、最大位移出现的位置。 (4)通过对20m水头下不同初始孔隙比及不同变形模量饱和砂土中盾构隧道衬砌结构的动力响应分析,揭示了管片衬砌孔隙水压波动值、加速度最大值、位移最大值以及管片衬砌单元应力波动与土体参数的关系。
[Abstract]:With the rapid development of social economy and the acceleration of urbanization, shield tunnel has become the main form of urban subway tunnel. In order to analyze the dynamic response of shield tunnel under seismic action in saturated sandy soil, this paper summarizes the present situation of seismic analysis of shield tunnel at home and abroad, and adopts theoretical analysis and numerical simulation methods. The dynamic response of shield tunnel in saturated sandy soil under strong earthquake is studied as follows: (1) the significance of the research, the characteristics of seismic response of shield tunnel, and the seismic response analysis method of shield tunnel are summarized. The dynamic effect theory of shield tunnel in saturated sand stratum under ground motion is expounded. (2) numerical simulation of seismic dynamic response of saturated sand stratum under sinusoidal wave is carried out, and the amplitude and frequency of sinusoidal seismic wave are obtained. The seismic duration is used to analyze the dynamic response of shield tunnel in saturated stratum. (3) on the basis of analyzing the type of pore pressure of saturated sand and its dynamic effect, the dynamic pore pressure effect acting on lining is expounded. Through numerical simulation of shield tunnel under different initial groundwater levels, the characteristics of pore water pressure fluctuation and element stress fluctuation of segment lining are analyzed, and the maximum fluctuation value and acceleration of pore water pressure are obtained. (4) by analyzing the dynamic response of shield tunnel lining structure with different initial void ratio and different deformation modulus saturated sand under 20m head, the pore water pressure fluctuation value of segment lining is revealed. The relationship between the maximum acceleration, the maximum displacement and the stress fluctuation of segment lining elements and soil parameters.
【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】：U455.43;U452.28
本文编号：2195976
[Abstract]:With the rapid development of social economy and the acceleration of urbanization, shield tunnel has become the main form of urban subway tunnel. In order to analyze the dynamic response of shield tunnel under seismic action in saturated sandy soil, this paper summarizes the present situation of seismic analysis of shield tunnel at home and abroad, and adopts theoretical analysis and numerical simulation methods. The dynamic response of shield tunnel in saturated sandy soil under strong earthquake is studied as follows: (1) the significance of the research, the characteristics of seismic response of shield tunnel, and the seismic response analysis method of shield tunnel are summarized. The dynamic effect theory of shield tunnel in saturated sand stratum under ground motion is expounded. (2) numerical simulation of seismic dynamic response of saturated sand stratum under sinusoidal wave is carried out, and the amplitude and frequency of sinusoidal seismic wave are obtained. The seismic duration is used to analyze the dynamic response of shield tunnel in saturated stratum. (3) on the basis of analyzing the type of pore pressure of saturated sand and its dynamic effect, the dynamic pore pressure effect acting on lining is expounded. Through numerical simulation of shield tunnel under different initial groundwater levels, the characteristics of pore water pressure fluctuation and element stress fluctuation of segment lining are analyzed, and the maximum fluctuation value and acceleration of pore water pressure are obtained. (4) by analyzing the dynamic response of shield tunnel lining structure with different initial void ratio and different deformation modulus saturated sand under 20m head, the pore water pressure fluctuation value of segment lining is revealed. The relationship between the maximum acceleration, the maximum displacement and the stress fluctuation of segment lining elements and soil parameters.
【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】：U455.43;U452.28
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