Study on Analog Theory of Rock Mass Simulation and Its Engineering Application

Table 3

Intactness assessment of rock masses of Xiangjiaba hydropower station dam base.

Rock quality grade	Degree of weathering	Intactness of rock masses			Location of distribution
		Velocity of acoustic wave/m/s	RQD in the tunnel/%	RQD in the borehole/%
I	Unweathered	>5000	>90	>85	Depth of dam base
II	Unweathered to weak weathering	4000–5000	75–90	60–85	Zones 1, 2, 4
III	Moderate weathering (lower) to weak weathering	3500–4000	62.5–75	45–60	Zones 1, 4, 5, 6
	Moderate weathering (upper)	3000–3500	50–62.5	30–45	Zone 6
	Weak weathering to unweathered				Zone 3
IV	Weak weathering to unweathered	2000–3000	25–50	5–30	Zones 3, 5
					Influence band of fault and concentrated joint band
V		<2000			Shattered fault zone and weak interlayer

Notes: The zone of the dam base is divided by six sub-zones, which are arranged in order from the right bank to left bank of the Jinsha River.