Study on the Effect of Internal Structure Construction Mode on the Explosive Dynamic Response in Highway-Railway Combined Shield Tunnel
In order to ascertain how the various internal structure construction modes affect the blast resistance of shield tunnel segment and internal structure,the 3D fine numerical calculation model for semi-prefabricated inter-nal structure and cast-in-situ internal structure has been created for the purpose of engineering application in high-way-railway combined shield tunnel,and the dynamic response and damage characteristics of segment and internal structure under the effect of blast load have been calculated and analyzed by using the explicit dynamic time history method.The study results indicate:compared with cast-in-situ internal structure,semi-prefabricated internal struc-ture shows stronger acceleration response at the connections under the effect of blast load and its longitudinal accel-eration peak is attenuated faster,but the internal structure sustains less severe damage.In addition,the acceleration peak at segment joint experiences abrupt change,and when the explosive is detonated in the middle of the traffic space,the acceleration peak at segment joint of semi-prefabricated internal structure is 20%～49%less than the ac-celeration peak at segment joint of cast-in-situ internal structure.
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