Seismic earth pressures of retaining wall from large shaking table tests

摘要

To ascertain seismic response of retaining wall in the Wenchuan earthquake, large shaking tablerntests are performed and an acceleration record is acted in 3 directions. In the tests, acceleration time historyrnrecorded at Wolong station in the Wenchuan earthquake are used to excite the model wall. Results from therntests show that the location of dynamic resultant earth pressure is 0.35-0.49H from toe of the wall for roadrnshoulder retaining wall on rock foundation, 0.33-0.42H for embankment retaining wall on rock foundation andrn0.46-0.77H for road shoulder retaining wall on soil foundation. Besides, dynamic earth pressure increasesrnwith the increase of ground shaking from 0.1g to 0.9g and the relationship is nonlinear. The distribution isrnclose to for PGA less than 0.4g, but larger for PGA larger than and equal to 0.4g, especially on the soil foundation.