中文摘要：

利用MTS 815岩石力学试验系统,对大理岩进行了单轴压缩和不同振动频率、不同动应力幅值的循环加卸载试验,探讨循环荷载的振动频率和动应力幅值对大理岩的动弹性模量和动泊松比的影响.研究结果表明,在不同应力幅值的循环荷载作用下,大理岩的动应力-动应变曲线不完全重合,形成了滞回环;随着动应力级别的提高,滞回环面积增大,能量耗散增加;随着循环周次的增加,累积不可逆变形增大.当动应力幅值的范围分别处在岩石弹性变形阶段和塑性变形阶段时,振动频率和动应力幅值对动弹性模量和动泊松比的影响不同.随着循环应力级别的提高,动弹性模量减小,而动泊松比呈现出逐渐增加的趋势;当动应力幅值处在岩石的屈服点以上时,随着振动频率的增大,动泊松比增加、动弹性模量减小.

英文摘要：

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.