中文摘要：

通过对强风化泥岩的室内动三轴试验及试验结果分析,研究循环荷载作用下其动力本构关系及主要影响因素,分析动弹性模量和阻尼发展特征,提出动力本构模型参数、动模量衰减模型、阻尼增长模型及其拟合参数。研究结果表明：强风化泥岩的动力本构关系符合双曲线模型,其相关系数大于0.9935;固结围压与模型参数a值存在较好的负线性相关性;天然含水率、干密度对模型参数b值存在显著的影响,含水率越大,干密度越大,b值越小;动弹性模量具有明显的应变软化特征,变化趋势满足负指数衰减模型;阻尼比随动应变的增大而增大,其变化趋势满足幂律函数关系,动荷载作用下动应变的变化在一定范围之内滞后于动应力的变化。

英文摘要：

On the basis of dynamic triaxial test results of the strongly weathered mudstone,the dynamic constitutive relation of the strongly weathered mudstone under the cyclic loading and the main influencing factors are analyzed. The development characteristics of the dynamic elastic modulus and damping ratio are discussed.Moreover,the parameters of the dynamic constitutive model,the attenuation model of dynamic modulus,the growth model of damping ratio and the model parameters are proposed. The results show that the dynamic constitutive relation of the strongly weathered mudstone was consistent with the R. L. Kondner hyperbolic model,and the correlation coefficient was greater than 0. 9935. The cell pressure σ3has a good linear correlation with the model parameter a,and the smaller the σ3,the larger the value a. However,the natural moisture content and the dry density have a significant impact on the model parameter b,indicating that the greater the moisture content,the smaller the value b,and the greater the dry density,the smaller the value b. The dynamic elastic modulus is characterized by strain softening,and the trends satisfy the negative exponential attenuation model. The damping ratio increases with the dynamic strain,and the tendency satisfies a power function. Under the dynamic loading,the dynamic strain lagged behind the dynamic stress within a certain range.