Abstract: A series of tests have been conducted to simulate post-liquefaction behavior of silt in a new universal triaxial torsional shear apparatus of Hohai University. Such effects on post-liquefaction of silt as soil dry density, severity of liquefaction, pre-vibration, non-regular vibration are discussed. It is found that post-liquefaction strain is composed of and . The bigger dry density is the larger and the larger shear modulus are during the stage of The more serious of liquefaction is, the larger is. But there is no difference of shear modulus during the stage of , when severity of liquefaction change. The pre-vibration and non-regular vibration affects slightly on post-liquefaction stress-strain relationship. A new post-liquefaction model of liquefied silt is proposed based on test results. And how to obtain parameters of the model is also introduced. The results predicted by the proposed method are consistent well with the experiment observation.

Key words: silt, post-liquefaction, lab test, stress-strain relationship