Prediction of Bench Blasting Vibration on Slope and Safety Threshold of Blasting Vibration Velocity to Undercrossing Tunnel

Table 7

Physical and mechanical parameters of the surrounding rock.

Surrounding rock type	Parameters
	Elastic modulus E (GPa)	Poisson’s ratio μ	Frictional angle φ (°)	Cohesion c (MPa)	Density ρ (kg·m^−3)	Dynamic tensile strength (MPa)
III	40	0.3	50	1.5	2500	3.7
IV	30	0.33	39	0.7	2400	3.3