Table 1 Duncan Chang E–B model parameters of dam materials.

From: Research on the slip deformation characteristics and improvement measures of concrete-faced rockfill dams on dam foundations with large dip angles

Materials

K

N

Rf

C/(kPa)

φ/°

Δφ/°

Kb

m

Kur

ρ (g/cm3)

Rockfill I

1400

0.27

0.67

28

50

11.8

764

0.03

2701

2.07

Rockfill II

Pressure slope

Backfill

1180

0.28

0.67

24

48

12.2

764

0.03

2276

2.10

Cushion layer

1150

0.28

0.60

21

51

12

623

0.47

2213

2.20

Transition layer

1040

0.28

0.60

21

52

12

623

0.12

2213

2.30

Overburden layer (Alluvium)

700

0.30

0.79

10

46.5

5.8

210

0.28

1400

2.09

Concrete face slab

Concrete parapet wall

Toe slab

ρ = 2.40 g/cm3; E = 25 GPa; μ = 0.20

  1. where K is the modulus number, n is the modulus index, Rf is the failure ratio, C is the cohesion, φ is the internal friction angle, △φ is the increment of internal friction angle φ, Kb is the bulk modulus number, and m is the bulk modulus index, Kur is the modulus number for unloading and reloading, ρ is the density.
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