Shaking table test on the seismic response of parallel tunnels closely crossing beneath a subway station
The seismic performance of underground structure systems is extensively studied,but research on the interaction mechanism and influence law of underground structure crossing sys-tems during an earthquake is limited.In this study,the influences of parallel tunnels crossing be-neath a subway station system on the site soil and the underground structure were investigated with a lg shaking table test.Test results show that(1)the underground structure would reduce the surface acceleration response by up to 25％;(2)the upper station would reduce the accelera-tion response of the underpass tunnels by up to 25％,and the influence of the underpass tunnels on the acceleration response of the upper station is complex and has no general regularity;(3)the influence of the underground structure on the dynamic characteristics(mainly the fundamental frequency)of the system is extremely limited and can be ignored in practical engineering.The research results could provide a reference for the seismic response analysis and preliminary design of the underground structure of a crossing system.
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维普
