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5.2 Load —Settlement Behavior
5.2.1 Load - Settlement Behavior of Untreated Soil Bed (G-1)
CHAPTER V
Results and Discussions
0.00 0 10 E E 20
lu 30 40
ci)
50 60 70
39.24 61.04 82.84 87.20
Load, kPa
Figure 5.1 a Load - Settlement Curve for Untreated Soil Bed G-1
5.2.2 Load - Settlement Behavior of Treated Soil Bed
Soil improvement techniques were applied to improve the inherent character of soft soil by increasing bearing capacity and minimizing settlement. Nine sand beds of different
KA dimensions under the model foundation were formed to examine the load- settlement behavior. The load settlement curves against all tests are shown in the Figure 5.1b to 5.lj.
The results obtained from the experiments for different treated conditions are discussed in the following articles.
5.2.2.1 Load - Settlement Behavior of Treated Soil Bed (G-2)
The load test was carried out on the treated soil bed G-2 as shown in the Figure 4.2a. The model CC footing was placed on the soft soil treated by granular fills of depth 150 mm (D), equal to the width of model foundation (B1) and both the length and width of granular fills were also equal to the width of model foundation (B1). The settlements against increments of load are recorded for two samples and plotted in the Figure 5.1h.
From two tests an average load against 25 mm settlement was determined. In this case the bearing capacity of the treated soil bed G-2 was found as 83 kPa which was 1.30 times more than that of untreated soil bed.
o .oc 0 10
7 20 30 40
U)
50 60
39.24 65.40 87.20 109.00
.01
Load, kPa
Figure: 5.1 b Loads - Settlement Curve for Treated Soil Bed G-2
165
5.2.2.2 Load - Settlement Behavior of Treated Soil Bed (G-3)
The test was carried out on the treated soil bed G-3 as shown in the Figure 4.2b. The model CC footing was placed on the treated granular fills of depth 150 mm (D), equal to the width of model foundation (B) and both the length and width of granular fills were equal to two times of width of model foundation (2131). The settlements against increments of load are recorded for two samples and plotted in the Figure 5.1 c. From two tests an average load against 25 mm settlement was determined. In this case the bearing capacity of the treated soil bed G-3 was found as 100 kPa which was 1.56 times more than that of the untreated soil bed.
0.00 39.24 65.40 87.20 109.00 130.80 04
10
30
I 50
60L
Load. kPa
Figure: 5.lc Loads - Settlement Curve for Treated Soil Bed G-3
5.2.2.3 Load - Settlement Behavior of Treated Soil Bed (G-4)
The test was carried out on the treated soil bed G-4 as shown in the Figure 4.2c. The model CC footing was placed on the treated granular fills of depth 150 mm (D), equal to the width of model foundation (131) and both the length and width of granular fills were equal to three times of width of model foundation (313f). The settlements against increments of load are recorded for two samples and plotted in the Figure 5.1d. From two tests an average load against 25 mm settlement was determined. In this case the bearing capacity of the treated soil bed G-4 was found as 102 kPa which was 1.59 times more than that of untreated soil bed.
0.00
04
E 20 i
E a 30 E a) a)40
(I)
39.24 65.40 87.20 109.00 130.80
50
60 -.
Load, kPa
Figure: 5.Id Loads - Settlement Curve for Treated Soil Bed G-4
167
5.2.2.4 Load - Settlement Behavior of Treated Soil Bed (6-5)
The test was carried out on the treated soil bed G-5 as shown in the Figure 4.2d. The model CC footing was placed on the treated granular fills of depth 225 mm(D), equal to 1.5 times of the width of model foundation (1 .5Bf) and both the length and width of granular fills were equal to the width of model foundation (Bf). The settlements against increments of loads were recorded and plotted in the Figure: 5.1e. From two tests an average load against 25 mm settlement was determined. In this case the bearing capacity of the treated soil bed G-5 was found as 110 kPa which was 1.72 times more than that of untreated soil bed.
0.00 43.60 87.20 130.80 152.60
0...____.__
10
E 20
E
C a) 30
E a)
40 50 09-111
Load, kPa
Figure: 5.1e Loads - Settlement Curve for Treated Soil Bed G-5
F
0.00 0 10 E 20 E
a) 30 E a)
(J) 40 50 60
43.60 87.20 130.80 152.60
5.2.2.5 Load - Settlement Behavior of Treated Soil Bed (G-6)
The load test was carried out on the treated soil bed G-6 as shown in the Figure 4.2e. The model CC footing was placed on the treated granular fills of depth 225 mm (D), equal to 1.5 time of the width of model foundation (1.513f) and both the length and width of granular fills was equal to 2.5 times of the width of model foundation (2.513f . The settlements against increments of loads were recorded and plotted in the Figure 5.1 f.
From two tests an average load against 25 mm settlement was determined. In this case the bearing capacity of the treated soil bed G-5 was found as 115 kPa which was 1.79 times more than that of untreated soil bed.
Load, kPa
Figure: 5.1f Loads - Settlement Curve for Treated Soil Bed G-6
169
Load, kPa
5.2.2.6 Load - Settlement Behavior of Treated Soil bed (G-7)
The test was carried out on the treated soil bed G-7 as shown in the Figure 4.2f. The model CC footing was placed on the treated granular fills of depth 225mm(D), equal to 1.5 time of the width of model foundation (1.5131) and both the length and width of granular fills was equal to 4 times of the width of model foundation (4Bf). The settlements against increments of loads were recorded and plotted in the Figure: 5.1g.
From two tests an average load against 25 mm settlement was determined. In this case the bearing capacity of the treated soil bed G-7 was found as 116 kPa which was 1.81 times more than that of untreated soil bed.
0.00 43.60 87.20 130.80 174.40
E 20 E
30 E
40
(I)
50 60
Figure: 5.1g Loads - Settlement Curve for Treated Soil Bed G-7
5.2.2.7 Load - Settlement Behavior of Treated Soil Bed (G-8)
The test was carried out on the treated soil bed G-8 as shown in the Figure 4.2g. The model CC fooling was placed on the treated granular fills of depth 300mm (D), equal to 2 times of the width of model foundation (2131) and both the length and width of granular fills were equal to the width of model foundation(Bt). The settlements against increments of loads were recorded and plotted in the Figure 5.1h. From two tests an average load against 25 mm settlement was determined. In this case the bearing capacity of the treated soil bed G-8 was found as 119 kPa which is 1.85 times more than that of untreated soil bed.
0.00 0 10 E 20 E E 30
0) 0) 4 (I)
:L
43.60 87.20 130.80 174.40
Load, kPa
Figure: 5.1h Loads - Settlement Curve for Treated Soil Bed (G-8)
171
0.00 0 5 10 E 15 E 20
C a, 25 E
3°
(/)35 40 45 50
43.60 87.20 130.80 174.40
5.2.2.8 Load - Settlement Behavior of Treated Soil Bed (G-9)
The test was carried out on the treated soil bed G-9 as shown in the Figure 4.2h. The model CC footing was placed on the treated granular fills of depth 300 mm(D), equal to 2 times of the width of model foundation (213) and both the length and width of granular fills were equal to 3 times of the width of model foundation (313f). The settlements against increments of applied loads were recorded and plotted in the Figure 5.1i. From two tests an average load against 25 mm settlement was determined. In this case load bearing capacity of the treated soil bed G-9 was found as 123 kPa which is 1.92 times more than that of untreated soil bed.
a
Load, kPa
Figure: 5.1i Loads - Settlement Curve for Treated Soil Bed (G-9)
0.00 0 5 10 15 E 20 E a) 25 E a) 30
= a) 35
(I)
40 45 50 55
43.60 87.20 130.80 174.40
FA-
5.2.2.9 Load - Settlement Behavior of Treated Soil Bed (G-10)
The tests are carried out on the treated soil bed G-10 as shown in the Figure 4.2i. The model CC footing was placed on the treated granular fills of depth 300 mm(D), equal to 2 times of the width of model foundation (2131') and both the length and width of granular fills was equal to 5 times of the width of model foundation (5Bf). The settlements against increments of loads are recorded and plotted in the Figure: 5.lj. From two tests an average load against 25 mm settlement was determined. In this case the bearing capacity of the treated soil bed G-10 was found as 125 kPa which is 1.95 times more than that of untreated soil bed.
Load, kPa
Figure: 5.lj Loads - Settlement Curve for Treated Soil Bed (G-10)
173