构造了一种分析方法，然后利用光栅结构的有关表达式得到这种二维结构的近似等效系数。
An approximate equivalent coefficient for two-dimensional sub wavelength was obtained with the related expressions of grating structure.
基于建立的结构LT MTMD系统的传递函数，导出了设置LT MTMD结构的动力放大系数(DMF)解析表达式。
Based on the formulated transfer function for the structure-LT-MTMD system, the analytical expression for the dynamic magnification factor (DMF) of the structure with a LT-MTMD is derived.
利用土体与衬砌结构之间的连续性条件和衬砌结构内边界上的边界条件，确定表达式的未知系数。
By utilizing the inner boundary condition of the lining structure and the continuity conditions between the soil and the lining, the unknown coefficients in the expressions are determined.
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