Abstract
In order to study deformation characteristics of humic soils deposited under railway embankment during earthquakes, a series of in-situ tests, laboratory tests and numerical analyses were conducted. In the laboratory, undrained cyclic triaxial tests were performed on undisturbed samples to evaluate their strain level dependency of shear modulus and hysteresis damping. Based on results from the in-situ and laboratory tests, seismic response analyses were executed to compute the amplification characteristics of the humic soil layer. In addition, effects of cyclic loading history on the strength properties under monotonic loading were investigated experimentally.
