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haking Table Test on Dynamic Damage Behaviors of a Circular Tunnel with Voids behind the Lining Subjected to Near-field Ground Motions
(1 School of Civil and Transportation Engineering, Hebei University of Technology，Tianjin 300401; 2 School of Transportation, Nantong University, Nantong 226019)
Abstract Considering the effect of near-field ground motion, a shaking table model test was conducted to the cir? cular tunnel with voids behind the lining. A comparative analysis was taken with aspects of acceleration response of foundation field domain, dynamic earth pressure of soil-structure contact surface, acceleration response of tunnel structure and dynamic strain rules. Meanwhile, the effect of near field ground motion on dynamic damage behaviors of the tunnel structure was studied based on a damage model. The results show that: 1) there is slight difference in the acceleration response at the different cross sections of the circular tunnel in the process of seismic wave loading,and tunnel structure affects the peak acceleration of subsoil at two sides while the changes of spectrum characteristics are not obvious; 2) when the intensity of input near-field ground motion is small, the average peak acceleration at the cross section with top voids is also small but the average dynamic strain response is large while the average peak acceleration at the cross section with dense top is large but the average dynamic strain response is small; 3) the damage is most serious at the scope of ±30° of the top of the cross section with voids behind the lining, which agrees with the seismic damage of existing circular tunnel.
Abstract：
Considering the effect of near-field ground motion, a shaking table model test was conducted to the cir? cular tunnel with voids behind the lining. A comparative analysis was taken with aspects of acceleration response of foundation field domain, dynamic earth pressure of soil-structure contact surface, acceleration response of tunnel structure and dynamic strain rules. Meanwhile, the effect of near field ground motion on dynamic damage behaviors of the tunnel structure was studied based on a damage model. The results show that: 1) there is slight difference in the acceleration response at the different cross sections of the circular tunnel in the process of seismic wave loading,and tunnel structure affects the peak acceleration of subsoil at two sides while the changes of spectrum characteristics are not obvious; 2) when the intensity of input near-field ground motion is small, the average peak acceleration at the cross section with top voids is also small but the average dynamic strain response is large while the average peak acceleration at the cross section with dense top is large but the average dynamic strain response is small; 3) the damage is most serious at the scope of ±30° of the top of the cross section with voids behind the lining, which agrees with the seismic damage of existing circular tunnel.
.haking Table Test on Dynamic Damage Behaviors of a Circular Tunnel with Voids behind the Lining Subjected to Near-field Ground Motions[J] MODERN TUNNELLING TECHNOLOGY, 2019,V56(1): 107-113
2019, Vol. 56 