CUED Publications database

On the seismic response of shallow rectangular tunnels in soft soils

Tsinidis, G and Pitilakis, K and Madabhushi, G and Heron, C (2015) On the seismic response of shallow rectangular tunnels in soft soils. In: UNSPECIFIED pp. 2237-2242..

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A series of dynamic centrifuge tests was performed on a rectangular tunnel model embedded in dry sand at the centrifuge facility of the University of Cambridge. An extensive instrumentation array was implemented to monitor the soil-tunnel response, which comprised of miniature accelerometers, pressure cells and position sensors in addition to strain gauges that recorded the strains within the tunnel lining. In the second phase of this research program representative test cases were numerically investigated by means of full dynamic analysis of the coupled soil-tunnel system using ABAQUS. The paper discusses several crucial aspects of the seismic response, as revealed by comparisons between the numerical and the experimental data, namely the lining dynamic internal forces, the magnitude and distribution of the dynamic earth pressures and shear stresses which develop around the rectangular tunnel and the effect of burial depth on the response characteristics. The interpretation of both the experimental and numerical data reveals, among others: (i) a rocking response of the model tunnel in combination with the racking mode and (ii) residual earth pressures on the side-walls and residual internal forces, after shaking, which are amplified by the tunnel's flexibility.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Divisions: Div D > Geotechnical and Environmental
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:31
Last Modified: 31 Aug 2021 08:47