Abstract The strength of dynamic interaction between tunnel lining and surrounding rock under earthquake ac?
tion is closely related to the relative stiffness between them. In order to analyze the influence of relative stiffness between tunnel lining and surrounding rock on structural internal force under earthquake action, the concept of flexibility ratio is introduced in aseismic numerical analysis. Through the treatment of seismic waves and boundary conditions, the variations of structural internal forces under different surrounding rock grades, different lining thicknesses, different concrete strength grades and different tunnel diameters are calculated and analyzed, and the basic law of seismic response of tunnel lining under different flexibility ratios is presented. The results show that: the larger the flexibility ratio, the smaller the structural internal force; in the case of multiple tunnel defenses, the stiffness of
adjacent structures should change gradually and the thickness of each layer should not be too large.
Abstract：
The strength of dynamic interaction between tunnel lining and surrounding rock under earthquake ac?
tion is closely related to the relative stiffness between them. In order to analyze the influence of relative stiffness between tunnel lining and surrounding rock on structural internal force under earthquake action, the concept of flexibility ratio is introduced in aseismic numerical analysis. Through the treatment of seismic waves and boundary conditions, the variations of structural internal forces under different surrounding rock grades, different lining thicknesses, different concrete strength grades and different tunnel diameters are calculated and analyzed, and the basic law of seismic response of tunnel lining under different flexibility ratios is presented. The results show that: the larger the flexibility ratio, the smaller the structural internal force; in the case of multiple tunnel defenses, the stiffness of
adjacent structures should change gradually and the thickness of each layer should not be too large.
REN Lei1 NIU Bin2 GUO Ting2 LIU Songyu2
.Study on the Influence of Flexibility Ratio on Tunnel Seismic Dynamic Response[J] MODERN TUNNELLING TECHNOLOGY, 2020,V57(4): 67-73
2020, Vol. 57 