Shock absorber with rigid-flexible combination model tests for tunnel opening section in high intensity seismic areas

CUI Guangyao1,JI Lei1,WANG Mingnian2,3,ZHU Chang’an4

Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (5) : 92-97.

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (5) : 92-97.

Shock absorber with rigid-flexible combination model tests for tunnel opening section in high intensity seismic areas

  • CUI Guangyao1,JI Lei1,WANG Mingnian2,3,ZHU Chang’an4
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Abstract

In order to study shock absorber technology with rigid-flexible combination for tunnel opening section in high intensity seismic areas, taking the entrance section of Bai-yunding tunnel as a background, large-scale shaking table model tests were conducted to study peak acceleration of ground motion, longitudinal strain, contact stress and structural internal forces through analysing test data. The test results showed that only taking structural strengthening measures, the growth percentage of structure safety factor minimum value of the whole tunnel opening section is between 30%—65%; only setting a shock absorption gap, that is between 40%—55%; the shock absorption gap has an obvious action to reduce forced displacements, and its shock absorption effect is obvious; taking the shock absorber technology with rigid-flexible combination, the growth percentage of structure safety factor minimum value of the whole tunnel opening section is between 85%—145% and its action is remarkable to resist earthquake motion and reduce forced displacements, the shock absorption effect is the best. The study results provided a reference for improving the aseismic performance of transportation tunnels in high intensity seismic areas.

Key words

tunnel engineering / highly seismic area / tunnel portal part / rigid-flexible composite / anti-seismic and damping;model test

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CUI Guangyao1,JI Lei1,WANG Mingnian2,3,ZHU Chang’an4. Shock absorber with rigid-flexible combination model tests for tunnel opening section in high intensity seismic areas[J]. Journal of Vibration and Shock, 2019, 38(5): 92-97

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