SIMPLIFIED ANALYSIS OF TUNNEL EARTHQUAKE RESPONSE AND CENTRIFUGE MODELLING CALIBRATION
HUANG Maosong1，2，CAO Jie1，2
(1. Department of Geotechnical Engineering，Tongji University，Shanghai 200092，China；2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education，Tongji University，Shanghai 200092，China)
Abstract：Based on plane strain and quasi-static assumption，by using elasticity theory method，the soil-spring coefficient and shear stress expression of stratum around a circular tunnel under dynamic load are derived. These are introduced into the response-displacement method to evaluate tunnel responses；and this method is further simplified and improved. To validate the revised approach，centrifugal tests are performed. The comparison between test result and analysis result by simplified and improved method is made；and it is proved that the revised simplified solution is feasible and practical. Meanwhile，the tunnel strains are observed，and the stress states under different force conditions(static and dynamic) are compared intuitively. The results indicate that the dynamic responses of tunnel are significantly different from those under static condition；and the performance of ground and tunnel depends on earthquake intensity and boundary conditions closely. The study results can provide a reference to earthquake resistance design of tunnel.
