Research on Effects of Blast Casting Vibration and Vibration Absorption of Presplitting Blasting in Open Cast Mine

Table 4

Mechanical parameters of rock mass of Heidaigou open cast.

Stratum	Density (kN/m^3)	Internal friction angle (°)	Cohesion (kPa)
Loess	19.50	29.5	45.1
Sandy mudstone	24.50	30	135
Fine sandstone	24.50	28	150
Medium sandstone	22.70	31.5	150
Coarse sandstone	22.40	32.0	130
Weathered mudstone	24.7	29.0	127.5
Coal	14	35	185.1
Siltstone	24.5	31.3	176.8