Hydro-Mechanical Properties of an Unsaturated Frictional Material

158
CHAPTER 7. ANALYSIS AND INTERPRETATION OF THE EXPERIMENTAL
RESULTS
Unsat. hydr. conductivity (10 -4m/s)Initial
3.0
2.5
2.0
1.5
void ratio e = 0.89
1.0 large scale tests: Results
0.5
0.0
0.1 1
Results small scale tests: Fredlund et al. (1994) Drainage Imbibition
10
drying - layer (310 mm) 2nd drying - layer (310 mm) Instantaneous Profil Method 1st
Matric suction (kPa)
large scale tests: Fredlund et al. (1994) Initial, 1st and 2nd drainage Results
and 2nd wetting Flow rate » 30 ml/min Flow rate » 100 ml/min 1st
Figure 7.15: Comparison of unsaturated hydraulic conductivity curves resulting from modified
pressure plate apparatus (steady state test) and sand column test I (loose specimen, transient
state test)
Unsat. hydr. conductivity (10 -4m/s)
3.0
2.5
2.0
1.5
1.0
0.5
0.0
void ratio e = 0.66 Initial
small scale tests: Fredlund et al. (1994) Results
0.1 1
Drainage Imbibition Flow rate » 100 ml/min
10 drying - layer (310 mm) Results large scale tests: Instantaneous Profil Method 2nd
Matric suction [kPa]
large scale tests: Fredlund et al. (1994) Initial, 1st and 2nd drainage Results
and 2nd imbibition Flow rate » 30 ml/min 1st
1st drying - layer (310 mm)
Figure 7.16: Comparison of unsaturated hydraulic conductivity curves resulting from modified
pressure plate apparatus (steady state test) and sand column test I (dense specimen, transient
state test)
first increases for the dense specimen. The smaller voids more easily absorb the water. Again
the unsaturated hydraulic conductivity function for the dense specimen is located above the