Abstract

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Title:: Damping Effect of Shock Absorption Layer of EPS Bead-loess Mixture to Tunnel Lining Structure in Loess Area

Author(s):: HU Zhi-ping; WEI Xue-ni; ZHANG Peng; WANG Rui; XIA Xiang-bo; School of Civil Engineering, Chang’an University

Keywords:: EPS bead-loess mixture; tunnel lining structure; shock absorption layer; finite element analysis; damping effect

Abstract:: In order to study the damping effects of shock absorption layer of expanded polystyrene sphere （EPS） bead-loess mixture to tunnel lining structure under different conditions, the numerical model of damping layer in the tunnel support system was established using finite element software ANSYS. The influences of mixing ratio of EPS beads, damping layer thickness and seismic intensity on the dynamic responses of tunnel lining structure were analyzed. The results show that the seismic energy transferred to tunnel lining structure can be reduced by setting the damping layer, and the normal stress, shear stress, maximum principal stress, displacement and acceleration peak value of the key points of tunnel lining structure are reduced. The damping effect will be more and more obvious with the increase of the EPS bead content within a certain range. When the thickness of damping layer is controlled in the range of 3050 cm, the damping effect is the best. The damping effect of damping layer is better under the action of strong earthquake, and the mixed soil damping layer is more suitable for seismic resistance of high intensity seismic zone. The research conclusion can provide reference for the later construction of damping engineering of tunnel lining structure in soil environment, especially in loess area.