Deformation prediction of structured soft clay under cyclic load

In order to analyze the deformation characteristics of structured soft clay in Tianjin Binhai New Aera, dynamic triaxial test was conducted under traffic load, soil structure's yield pressure was considered based on the disturbed state concept, a disturbed function was put forward which considered the gradual destruction of soil structure under cyclic load, an empirical formula of plastic deformation was proposed and vertified by using the test. Analysis result shows that the relationship between accumulative plastic strain and cyclic number under cyclic load is divided into stable type and destroyed type. Accumulative plastic strain increases with the increase of cyclic number. There exists a critical cyclic stress ratio under the same confining pressure. The maximum of critical cyclic stress ratio decreases with the increase of confining pressure. Obviously, the empirical formula reflects the deformation characteristics of soil under traffic loadi.