Study On Seismic Responses For Tunnel Lining Of Broken Surrounding Bock In High Intensity Seismic Zone

The 8.0 magnitude earthquake occurred in Wenchuan on May 12,2008,this earthquake led to roads,bridges,tunnels and other infrastructure has been severely damaged,resulting in huge casualties and economic losses.At the same time with the continuous construction of the western construction,a large number of mountain tunnels through the geological conditions of the complex broken rock site,many tunnels are located in high intensity earthquake area.Therefore,it is of great economic significance to study the seismic response of tunnels in high-intensity seismic zones and to propose targeted earthquake-proofing measures.It also has far-reaching social significance for the design and construction of new tunnelsBased on the study of the earthquake disaster,the paper analyzes the influencing factors of tunnel earthquake damage and then makes the reasonable selection of seismic wave and the analysis of numerical theory.Based on the above study,the high-intensity earthquake zone Tunnel dynamic characteristics of the study,and two kinds of seismic damping measures to study.The specific research contents are as follows:1.Based on the latest research results after the wenchuan earthquake,the main types of tunnel earthquakes are summarized,and the influencing factors of tunnel earthquakes are studied.The symmetrical suggestions are put forward to reduce the damage of mountain tunnels.2.According to the example of the catching gully tunnel project,the numerical model is established by using Midas/GTS finite element analysis software,and the dynamic simulation of wolong wuchang wave from different directions is carried out.The dynamic response characteristics of the displacement,velocity,acceleration stress and internal force of tunnel lining structure are studied.It is found that there are differences in the dynamic response values of different cross-sectional positions and different positions of the tunnel.The horizontal transverse excitation seismic response structure is larger than the horizontal longitudinal and vertical directions,and must be paid attention to in the seismic design process.Therefore the tunnel hole bias has a great influence on the dynamic response of the structure.3.The seismic lining effect of the tunnel lining structure is studied by using the whole-ring grouting reinforcement and the anti-seismic measures of the damping layer.The seismic damping effect of the different grouting reinforcement area and the different damping layer on the tunnel lining structure is studied.The paper puts forward the grouting reinforcement range and the parameters of the cushioning layer to be used in the engineering practice.Finally,the study and research achievements of this paper are summarized,and the shortcomings and limitations of the research and the future research directions are put forward.