Shaking table tests on mitigation of liquefaction-induced subsidence of river dikes

摘要

This text concerns mitigation of significant subsidence of embankments induced by seismic liquefaction of the foundation soil. Since the particular interest lies in the protection of river dikes, a relatively economical mitigative measure is required. It is important, at the same time, that a limited magnitude of subsidence, such as 1 meter, is still allowed in most dikes unless flooding of river water is imminent. With these view points, shaking table tests were run on river dike models with embedded sheet pile walls at the toes. Tests proved that these walls reduce the lateral flow of liquefied subsoil and consequently mitigate the subsidence. An analytical method to predict this mitigative effect was developed which is based on energy principlesand experimentally-observed mode of soil deformation. This method is able to give a good prediction despite that it needs only limited soil data as available from conventional in-situ liquefaction studies.