Experimental study on seismic interaction of single pile-soil-bridge at liquefiable site based on large scale shaking table test

Based on shaking table test at scale ratio of 1:10, seismic response characteristics of single pile-soil-column pier at liquefiable site were studied. Dynamic macroscopic characteristics of single pile-column pier at liquefiable site were well reproduced. Dynamic displacement of column pier and shaking table, dynamic strain of pile and column pier, pore water pressure and pore water pressure ratio of sand layer are all satisfied with the general law-reactions are stronger with the increasing of input acceleration. Further more, permanent deformation does not arise with input of weak shake; displacement of the column pier is much bigger than that of the shaking table with various shake inputs; the biggest dynamic strain of the pile appears near the interface of upper clay and sand layer and decreases gradually to the two ends; deformation of the pile belongs to elastic with input of weak shake, but nonlinearity becomes remarkable and symmetry of strain increment in tensile and compressive zone disappears with input of strong shake. Amplitude of the input shake, buried depth, and horizontal distance to the pile are important influential factors to pore water pressure and the ratio. Pore water pressure increases, reaches its peak value and disperses fast with input of weak shake as compared with it increases fast, but reaches peak value and disperses slowly with input of strong shake. The results are useful to recognize seismic response of pile-soil-bridge structure and accumulate basic test data to further seismic safety evaluation of bridge structure at liquefiable site.