Study on Shaking Table Test for Seismic Response of Pile Foundation of Bridges at the Permafrost Regions

Based on the research project of pile foundation of the Qingshui River Bridge,which is a typical engineering named by bridge instead of road and locates at high temperature and instability permafrost region along the Qinghai-Tibet Railway. Under seismic dynamic loading,the shaking table test for the scale model of the piles is carried out when the soil temperature around model piles is below 0℃. The interaction between piles and frozen soil under seismic loading is researched,and the characteristics of seismic response of the pile structure are analyzed. Moreover,that the effect law of dynamic loading response of the piles on temperature and strain around piles is achieved,and the stability of the pile foundation of bridges at high temperature and instability permafrost region is evaluated as well.