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Analysis of the Shock Absorption of Tunnel-Soil-Surface Building Interaction System
(1. School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300400; 2. School of Civil Engineering,Hebei University of Architecture, Zhangjiakou 075000; 3. Hebei Provincial Technology Innovation Center for Transportation Infrastructure Engineering in Cold Regions, Zhangjiakou 075000)
Abstract A 3D finite element calculation model was established to analyze the shock absorption effect of shock ab? sorption measures taken for the tunnel-soil-surface building interaction system, and the time-history analysis method was adopted to analyze the dynamic response of this model. Based on the analysis of the acceleration, displacement and stress responses of tunnels and surface buildings, the impact of the thickness of shock absorption layer on the shock absorption effect of this system was studied when the tunnel shock absorption layer (or foundation shock absorption layer) was independently set. In addition, a novel scheme of combined shock absorption was put forward,and the primary and secondary relationship of different factors in terms of the impact on shock absorption effects was studied through orthogonal test. Finally, the shock absorption effects of these combined shock absorption measures were analyzed under different seismic waves. The results showed that (1) the shock absorption layer of a tunnel could significantly reduce the stress and acceleration of the tunnel, but if the elastic modulus of the shock absorption layer was too small, the tunnel displacement response would be enlarged; (2) when the depth of the foundation shock absorption layer was 0 m, the best shock absorption effect would be obtained and the relative displacements of surface buildings could be significantly decreased; and (3) the combined shock absorption measures taken under different seismic waves could realize a good shock absorption effect, and meanwhile, such shock absorption effect was superior to that of the single shock absorption layer.
Abstract：
A 3D finite element calculation model was established to analyze the shock absorption effect of shock ab? sorption measures taken for the tunnel-soil-surface building interaction system, and the time-history analysis method was adopted to analyze the dynamic response of this model. Based on the analysis of the acceleration, displacement and stress responses of tunnels and surface buildings, the impact of the thickness of shock absorption layer on the shock absorption effect of this system was studied when the tunnel shock absorption layer (or foundation shock absorption layer) was independently set. In addition, a novel scheme of combined shock absorption was put forward,and the primary and secondary relationship of different factors in terms of the impact on shock absorption effects was studied through orthogonal test. Finally, the shock absorption effects of these combined shock absorption measures were analyzed under different seismic waves. The results showed that (1) the shock absorption layer of a tunnel could significantly reduce the stress and acceleration of the tunnel, but if the elastic modulus of the shock absorption layer was too small, the tunnel displacement response would be enlarged; (2) when the depth of the foundation shock absorption layer was 0 m, the best shock absorption effect would be obtained and the relative displacements of surface buildings could be significantly decreased; and (3) the combined shock absorption measures taken under different seismic waves could realize a good shock absorption effect, and meanwhile, such shock absorption effect was superior to that of the single shock absorption layer.
XIE Jun1,
2,
3 DUAN Long2 LIANG Jinxiao2 LI Yantao1 SONG Jinhui1
.Analysis of the Shock Absorption of Tunnel-Soil-Surface Building Interaction System[J] MODERN TUNNELLING TECHNOLOGY, 2022,V59(3): 136-145
2022, Vol. 59 