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饱和局部非均匀土在动载作用下力学响应的研究一直是动力学领域的难点,如何描述非均匀介质的局部结构,衡量其对宏观孔压产生和消散的影响,目前尚无成熟的理论模型和分析方法。基于有关局部非均质土波动理论的最新研究成果,建立能够描述局部结构对孔压增长和消散过程影响的动力学模型。针对周期荷载作用下的一维饱和岩土层,获得孔隙水压分布的解析解。分别以松弛时间和荷载频率为变量,定量地分析这两个参数对孔隙水压发展的影响趋势,并确定两者对孔压发展的敏感区间,以上述分析为基础,提出对应孔压极值时松弛时间和荷载频率的关系曲线。分析结论对非均匀饱和土动力学的理论研究和工程应用有一定价值。
The study on the mechanical response of saturated partially inhomogeneous soil under dynamic loading has been a difficult point in the field of dynamics. How to describe the local structure of inhomogeneous media and measure its influence on the generation and dissipation of macro-pore pressure is not yet mature theoretical model And analysis method. Based on the latest research results on local inhomogeneous soil fluctuation theory, a dynamic model capable of describing the influence of local structure on pore pressure growth and dissipation process is established. For the one-dimensional saturated soil layer under cyclic loading, an analytical solution of pore water pressure distribution is obtained. Taking relaxation time and load frequency as variables respectively, the influence of these two parameters on the development of pore water pressure is quantitatively analyzed, and the sensitive interval between pore pressure and pore pressure development is determined. Based on the above analysis, the corresponding pore pressure extremum When the relaxation time and load frequency curve. The conclusion of the analysis is of certain value to the theoretical research and engineering application of the dynamics of heterogeneous saturated soils.