Abstract
To verify the seismic isolation effect in the cross sectional direction of rectangular tunnel, model vibration tests were performed. Two 1/25 tunnel models made of acrilyc plates were embedded in the sand layer constructed in the shear stack box on the shaking table. One model was covered by a soft isolation layer, the other one was non-isolated. The test results indicated remarkable reduction of cross sectional forces and tangential earth pressures acting on the isolated model. The authors also simulated the test results using a dynamic finite element method. Good agreement on the seismic isolation effect was obtained between the test and the analytical results.
