Quantitative and controllable sample preparation method for structural surface morphology spectrum components

The invention discloses a quantitative and controllable sample preparation method for structural surface morphology spectrum components. The method comprises the following steps of S1, acquiring a structural surface three-dimensional morphology model consistent with an actual shearing state of a rock mass structural surface; S2, determining a distribution function of the mean square value of the fluctuation height of the structural surface in a frequency range based on the two-dimensional power spectrum density; S3, taking a turning point of a function diagram as a boundary frequency ftc of a high-frequency component and a low-frequency component; S4, quantitatively controlling the content ratio gamma 0 of the high-frequency component and the low-frequency component by adjusting the content of the high-frequency component, and calculating to obtain the upper frequency limit fu of the high-frequency component; S5, extracting frequency components of the rock mass structural surface according to ftc or fu, and e