Dynamic Response Characteristics of Vibration Loads on Highway-Metro Integrated Shield Tunnels
To investigate dynamic response characteristics of vehicle-train vibration loads on internal structures and surrounding soil of highway-metro integrated shield tunnels,finite element software ABAQUS was used to numerically simulate internal structures and surrounding soil of a highway-metro integrated shield tunnel.Vehicle and train vibration loads were coupled by using Dload subprogram of ABAQUS software.Single vibration loads and vehicle-train vibration load were respectively introduced into the highway-metro integrated shield tunnel,and changes of acceleration,displace-ment,stress,and strain of the internal structure and surrounding soil of the highway-metro integrated shield tunnel under different working conditions were analyzed.The results show that vibration load frequencies of vehicles and trains are different,and the combined action produces a beat frequency phenomenon,resulting in amplitude of synthesized load in the same direction being smaller than that of partial load.When the frequency is the same,the amplitude of synthesized load is the largest.The soil above pipe segments and the soil outside unenclosed arc lining experience significant strains,and the maximum plastic strain occurrs on the right side of the arch crown,reaching 7.032×10-6.The prefabricated box culvert bracket columns and top plates in the internal structure of the highway-metro integrated shield tunnel exhibit large tensile and compressive strains.During long-term operation,it is necessary to regularly inspect and provide necessary support for the positions of prefabricated box culvert bracket columns and top plates.
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