Railway ballast grading and ballast bed performance mapping method and system

The invention discloses a method and a system for mapping railway ballast gradation and ballast bed performance, and the method comprises the steps: determining respective ballast bed performance parameters of a plurality of different railway ballast gradation under the same working condition, and building a ballast bed performance parameter matrix; grading characterization parameters are determined, values are assigned to the grading characterization parameters corresponding to each railway ballast grading, and a grading characterization parameter matrix is established; based on the ballast bed performance parameter matrix, performing normalization processing on each ballast bed performance parameter; based on the gradation characterization parameter matrix, performing normalization processing on each gradation characterization parameter; determining the relevance between all grading characterization parameters and each ballast bed performance parameter; and based on the relevance, establishing a mapping rel