飽和砂土地層盾構(gòu)隧道的地震動力響應(yīng)分析
[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.
【學(xué)位授予單位】:西南交通大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2014
【分類號】:U455.43;U452.28
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