Shaking table tests and numerical simulation for seismic response characteristics and their mutual influence laws of a 3-D cross tunnel structure

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (19) : 233-241.

LIU Cong1, PENG Limin1, LEI Mingfeng1,2, SHI Chenghua1, LI Yufeng1,3

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Abstract

Aiming at problems of seismic response features and their mutual influence laws of a 3-D cross tunnel structure, shaking table tests were conducted for its model under El seismic waves in 3 directions and 6 working conditions with 3 seismic intensities.The test results showed that the higher the seismic intensity, the larger the seismic acceleration and axial strain at the tunnel’s feature points;under El waves in 3 directions and the seismic intensity 9, along the axis of upper tunnel side wall bottom, the maximum seismic acceleration of the cross center section is less than that of a common section, while the maximum hoop strain of the cross center section is larger than that of a common section;along the direction of arch haunch axis of the underpass tunnel, the maximum acceleration of the cross center section is larger than that of a common section, while the maximum axial strain is less than that of a common section. Then a 3-D numerical model was built and used to do numerical simulation.The simulation results were compared with testones to verify each other.The numerical results showed that under El waves in 3 directions and the seismic intensity 9, along the axial direction of upper tunnel, the maximum values of σ1, σ3 and displacement in the main seismic direction at various feature points of cross center section are larger than those of a common section; along the axial direction of the underpass tunnel, the maximum values of σ1, σ3 and displacement in the main seismic direction at various feature points of cross center section are smaller than those of acommon section.

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Crossing tunnels / Shaking table test / Response characteristics

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LIU Cong1, PENG Limin1, LEI Mingfeng1,2, SHI Chenghua1, LI Yufeng1,3. Shaking table tests and numerical simulation for seismic response characteristics and their mutual influence laws of a 3-D cross tunnel structure[J]. Journal of Vibration and Shock, 2019, 38(19): 233-241

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