Acceleration Characteristics of a Rock Slide Using the Particle Image Velocimetry Technique

Table 2

Velocity evolution versus time (m/s).

	The top of rock slide	Sliding surface	Sliding body	Sliding bed
Initial stage (0~0.04 s)	−0.03	0.05	−0.02	−0.02
	0	0.01	0	−0.01
The coalescence stage (0.04~0.08 s)	−5.73	0.41	0.35	−0.41
	−2.91	8.20	2.48	−0.61
The postcoalescence stage (0.08~0.12 s)	−6.00	10.68	4.36	−1.98
	−6.73	12.99	4.71	−1.94