高烈度地震區(qū)破碎圍巖段隧道襯砌動力特性研究
[Abstract]:A magnitude 8.0 earthquake occurred in Wenchuan on May 12, 2008. The earthquake caused serious damage to roads, bridges, tunnels and other infrastructure, resulting in huge casualties and economic losses. At the same time, with the continuous development of the western construction, a large number of mountain tunnels pass through the fractured surrounding rock areas with complex geological conditions, many of which are located in high-intensity seismic areas. Therefore, it is not only of great economic significance to study the seismic dynamic response of tunnels in high intensity earthquake areas, but also to put forward targeted seismic and seismic mitigation measures for the design and construction of new tunnels. It is also of profound social significance. Based on the investigation and investigation of tunnel earthquake disasters, this paper analyzes the influencing factors of tunnel earthquake damage, and then carries out the work of reasonably selecting seismic waves and analyzing the numerical theory. Based on the above research, the dynamic characteristics of the tunnel in the high intensity earthquake area are studied, and two kinds of seismic and seismic mitigation measures are studied in the context of the Gaoyanggou Tunnel of Wenma Expressway. The specific research contents are as follows: 1. By consulting the domestic and foreign earthquake disasters, combining with the latest research results after Wenchuan earthquake, this paper summarizes the main types of tunnel earthquake disasters, studies the influencing factors of tunnel earthquake disasters, and puts forward some symmetrical suggestions for reducing the earthquake damage of mountain tunnels. 2. Based on the practical example of Gaoyanggou tunnel project, the three-dimensional numerical model was established by using Midas/GTS finite element analysis software, and the dynamic numerical simulation of the Wolong wave excited into Wenchuan from different directions was carried out, and the displacement and velocity of tunnel lining structure were studied. The dynamic response characteristics of acceleration, stress and internal force. It is found that the dynamic response of tunnel lining is different in different directions, and the seismic dynamic response of horizontal lateral seismic wave is greater than that of horizontal longitudinal and vertical, so attention should be paid to it in the course of seismic design. At the same time, the tunnel opening bias has a great influence on the tunnel lining structure. In this paper, under the action of horizontal transverse seismic wave, the anti-seismic effect of different grouting areas and different damping layers on the tunnel lining structure is analyzed by using the anti-seismic measures of the whole ring grouting reinforcement and the setting of the damping layer. The range of grouting reinforcement and the parameters of damping layer are proposed. Finally, this paper summarizes the research results, puts forward the shortcomings and limitations of the research and the future research direction.
【學(xué)位授予單位】:蘭州交通大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:U451.4
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