DYNAMIC TRIAXIAL EXPERIMENTAL RESEARCH ON DAMPING PARAMETERS AND DYNAMIC ELASTIC PARAMETERS FOR MARBLE
NIE Ming1，2，XU Jin1，2，REN Haonan1，2，LIU Jianfeng1，2
(1. State Key Laboratory of Hydraulics and Mountain River Engineering，Sichuan University，Chengdu，Sichuan 610065，China；
2. School of Water Resources and Hydropower，Sichuan University，Chengdu，Sichuan 610065，China)
Abstract：The dynamic triaxial tests for marble under different confining pressure are conducted on MTS815 Flex Test GT rock mechanics test system for the first time. Damping parameters and dynamic elastic parameters of marble are tested. The sine wave is adopted in cyclic loading tests at the frequency of 3 Hz，and the cyclic number is 30. The upper limit of dynamic stress is 0.6 times of the compressive strength of specimen under corresponding confining pressure，while the lower limit of dynamic stress is 5.09 MPa. The research results are shown as follows：damping ratios，damping coefficients and dynamic Poisson?s ratios of marble decrease with the increasing cyclic loading number，while they increase with the increasing confining pressure. Dynamic elastic moduli increase with the increasing cyclic loading number，while they decrease with the increasing confining pressure. Dynamic elastic moduli are always greater than static elastic moduli，while dynamic Poisson?s ratios are always smaller than static Poisson?s ratios under different confining pressures；and the higher the confining pressure is，the greater the difference value is. Mechanical properties of marble are gradually reinforced within 30 dynamic loading cycles.
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2011, Vol. 30 
