Abstract
The effects of pile foundation on the stability of GRS integral bridge were investigated by performing the followings two model loading tests; a) lateral loading model wall tests that was simulated to the thermal lateral cyclic displacements at the top of the facing caused by seasonal thermal expansion and contraction of the bridge girder, and b) 1g shaking table tests. From the results of the lateral loading wall tests, the residual settlement of backfill due to the thermal cyclic displacement of the girder were fully alleviated by not only reinforcing the backfill but also fixing the lateral displacement of bottom of the facing by using of pile foundations. On the other hand, it was confirmed that the seismic stability of GRS integral bridge without pile foundation is sufficiently high. The seismic stability of GRS integral bridge does not increase when pile group with short piles were applied. It is necessary to apply group pile with short piles to ensure sufficiently high stability of GRS integral bridge.
