Hydro-Mechanical Properties of an Unsaturated Frictional Material

4.6. EQUIPMENT USED 93
Volumetric water content (%)
Volumetric water content (%)
50
40
30
20
10
0
50
40
30
20
10
Volumetric water content
(%)
Volumetric water content (%)
0
50
40
30
20
10
0
50
40
30
20
10
0
-3
-4 outflow
0 5 10 15
Water
20 of 1st 1000 ml water: no changes in water content Ouflow
Time (min)
TDR
Depth 70 mm
Depth 160 mm
Depth 260 mm
0 5 10 15
Water Outflow of 2nd 1000 ml water:
20 of water content in a depth of 70 mm decrease
Time (min)
Tensiometer
Pore-water pressure (kPa)
Pore-water pressure (kPa)
-3
-4 outflow
-3
-4 outflow
0 5 10 15
Water Outflow of 3th 1000 ml
20 further decrease in water content in a depth of 70 mm water:
Time (min)
0 5 10 15 20
Time
Ouflow of water: decrease of water content in depth 70 mm and 160 mm no change in water content
(min)
depth 260 mm Water outflowin
Pore-water pressure (kPa)
Pore-water pressure (kPa)
4
3
2
1
0
-1
-2
4
3
2
1
0
-1
-2
4
3
2
1
0
-1
-2
4
3
2
1
0
-1
-2
-3
-4
outflow Water
of 1st 1000 ml water: decreasing pore-water Ouflow
pressure in all depths
0 5 10 15 20
outflow Water
Time (min) of 2nd 1000 ml Ouflow
further decrease of pore- water:
0 5 10 15 20
Time
water pressure in all depths
(min) of 3th 1000 ml Ouflow
outflow Water
further decrease of pore- water:
0 5 Time 10(min) water pressure in all layers
15 20
of water: decrease of pore-water pressure in all depths Ouflow
Water outflow
0 5 10
Time (min)
15 20
Figure 4.19: Verification of response time and suitability of TDR sensor and tensiometer
measurements in column testing device - experimental results