Analysis On Seismic Dynamic Response Of The Anchor-bar And Surrounding Rock-soil System

Due to the particular geography and the requirement of engineering construction of southwest China, we need reinforce many highslope engineering. The widespread use of the supporting structure with anchor-bat in all kinds of project as a result of its unique advantagements. Especially, nowadays, with the rapid development of traffic building of southwest China, the supporting structure with anchor-bat play a important role in highslope disposal of railway engineering and highway engineering. But in Wenchuan earthquake the defects of anti-seismic measures of the supporting structure with anchor-bat had were exposed. A large number of earthquake damage phenomena show the design and build of the supporting structure with anchor-bat didn't consider the earthquake action carefully. Consequently, relevant analysis and research on seismic response mechanism of the supporting structure with anchor-bat are necessary for highslope disposal. By means of these measures we may attain some references and guidances for anti-seismic measures of the supporting structure with anchor-bat.The research process of this thesis are made up of four aspects. Frist of all, a dynamic analysis model of anchor-bar and surrounding rock-soil system is proposed in the present paper. The interaction between rock-soil and anchor-bar is treated as linear spring and damping system related to velocity. The inertia of the facing upon anchor-bar is simplified as an linear spring for analysis. A differential equation of vibration under horizontal harmonic earthquake are established, and the analytical solutions are obtained for steady vibration. Secondly, Large-scale FEM with ANSYS software is carried out to verify the proposed calculation model. Consequently, the analysis of relationship between dynamic parameters and anchor-bar aixal force are performed, and the influence of dynamic parameters on anchor-bar aixal force are concluded. Finally, combine the theoretical result with numerical simulation to reanalyze the anchoring slope stability during Earthquake.