XIAO Di,DUAN Xu,LIU Wuchao,et al.Experimental Study on Dynamic Response of Upper Orthogonal Comprehensive Utility Tunnel under Subway Vibration[J].Journal of Disaster Prevention and Mitigation Engineering,2023,43(05):1151-1159.
XIAO Di,DUAN Xu,LIU Wuchao,et al.Experimental Study on Dynamic Response of Upper Orthogonal Comprehensive Utility Tunnel under Subway Vibration[J].Journal of Disaster Prevention and Mitigation Engineering,2023,43(05):1151-1159. DOI: 10.13409/j.cnki.jdpme.20220228001.
Experimental Study on Dynamic Response of Upper Orthogonal Comprehensive Utility Tunnel under Subway Vibration
In order to reveal the dynamic response law of the upper orthogonal pipe gallery under subway vibration load, a scaled physical model test method was used to simulate the vibration load generated by subway train operation. The dynamic response characteristics of vibration propagation through the subway tunnel-loess foundation-integrated pipe gallery path were studied. Experimental results show that: the vibration generated by subway operation propagates from the top of the tunnel to the upper soil, showing a law of sudden decrease first and then slow decrease. The acceleration response is mainly concentrated in the upper 40 cm (prototype 4 m) section of the tunnel, while the dynamic soil pressure exhibits an obvious response throughout the entire section of 80 cm (prototype 8 m) vertical distance between the tunnel top and the upper pipe gallery. The top, side and bottom plates of the pipe gallery at the central position after the vibration propagates to the upper orthogonal pipe gallery have a strong influence, and show a relatively stable proportional relationship under the same vibration load. As the subway vibration load increases, the acceleration response of the upper orthogonal pipe gallery structure is gradually enhanced, and the increase of the dynamic contact earth pressure between the pipe gallery structure and the surrounding soil becomes more obvious.
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