Dynamic Response and Time-Frequency Characteristic of Dangerous Rocks under the Combined Action of Rock Cavity Weathering and Earthquake

Table 1

Rock block and crack size table (unit: m).

Category	Layer number
	Level one	Level two	Level three	Level four
Rock block	3.3	4.2	5.0	5.5
Crack	1.65	2.1	2.5	2.75