Abstract：On the rock mechanics test system with MTS 815 Flex Test GT, the tests for marble cylindrical specimens were carried out, under the uniaxial static loads and cyclic loading and unloading with different dynamic stress amplitudes and frequencies. Thus, the authors studied the effects of cyclic frequency and dynamic stress amplitude on dynamic elastic modulus and dynamic Poisson's ratio. The results show that: under the action of cyclic loads with different stress amplitudes, dynamic stress-strain curves of marble cylindrical specimen are incompletely overlapped and hysteretic loops are formed; with the increasing of dynamic stress level, hysteretic loop area and energy dissipation improve; as the cycle period increasing, the amount of accumulated irreversible deformation improves. The influences of cyclic frequency and dynamic stress amplitude on dynamic elastic modulus and dynamic Poisson's ratio are different, while the range of dynamic stress amplitude is in the elastic zone or plastic zone. With dynamic stress amplitude growing up, dynamic elastic modulus decreases, while dynamic Poisson's ratio is of increasing tendency. When the ranges of dynamic stress amplitude are in a plastic zone, dynamic Poisson's ratio decreases with cyclic frequency growing up, while dynamic elastic modulus is of increasing tendency.

Keyword：marble;dynamic characteristics;cyclic loadings;cyclic frequency;dynamic stress amplitude;