Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN: 9781305635180
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 11, Problem 11.5P
To determine
Find the temporary surcharge required to eliminate the primary consolidation settlement in 6 months.
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2 (a) During the construction of a highway bridge, it is expected that the average permanent
load on a clay layer will increase by about 180kPa. The soil profile and some
parameters of the soil is given in diagram below.
(i)
Estimate the value for consolidation settlement if the value of Compression index
equal to 0.36.
(ii) Determine the surcharge needed to eliminate the entire primary consolidation in 6
months.
(i)
Suggest a best method to reduce the time and amount of surcharge to eliminate
the entire primary consolidation
1.2m ( water table)
Yan= 18 kN/m
Y= 21 kN/m
Sand
7.0m
Yer 20 kN/m
Clay
C- 0.36; CV = 0.38 m/month
Sm
Sand Y= 23 kN/m
1.0
1.0
Sand
Sand
0.8
Clay
H = L. Ch
0.6
Sand' Au,= constant
RockAu.- constant
0.4
0.2
10
20
30
40
50
60
70
80
90
Average degree of consolidation, U(%)
0.2
0.4
0.6
APn 08
P.
9.1 0,5 I 2
5 10
1.0
1.2
1.4
1.6
40
50
60
70
80
90
100
U (%)
Plot of Ap/Apw against U for various values of
Ap/p
surcharge of 1000 lb/ft?? Assume C, = 1/6 C.
8.6 A soil profile is shown in Figure 8.23. The preconsolidation pressure is 3400 lb/ft?. Estimate
the primary consolidation settlement that will take place as a result of a surcharge
Ao = 1500 lb/ft. Assume C, = 1/5 C.
%3D
%3D
Aa
Dry sand
90=2
G, = 2.65
10 ft
Groundwater table
Sand
10 ft-
G, = 265
Clay
10 ft
W= 30%
G,= 2.7
Liquid limit=35
Rock
Figure 8.23
aning. All Rights Reserved. May not he copied, scanned or duplicated in whole or in
Due to olectrIGK nhu scme third parry COnent may be suppressed inm the eBook andoreChupters
The following technical data are given below:
Overburden pressure = 180KPa
Increase in pressure = 140KPa
Clay thickness = 8m
Compression Index = 0.315
Void ratio = 1.132
What is the total settlement in clay?
Chapter 11 Solutions
Fundamentals of Geotechnical Engineering (MindTap Course List)
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, civil-engineering and related others by exploring similar questions and additional content below.Similar questions
- Refer to Figure 2, estimate the primary consolidation settlement in the clay layer. Given: Ag = 85 kN/m²; Hi = 2 m; H2 = 4 m; and H3= 6 m. Soil characteristics are as follows: Sand: ydx 14 kN/m³, Ysat 18 kN/m³ Clay: LL = 54; e = 0.98; Ysat 19 kN/m'; Cs =- Cc 150 kN/m? H3 Sand Clay ョ→arrow_forwardRefer to Figure 11.40. Given: H = 5 ft, H2 = 7 ft, H3 = 6 ft, and Ao = 3000 lb/ft. Also, • Clay: e = 1.1, G, • Sand: e = 0.58, G, = 2.65 %3D %3D = 2.72, LL = 45 %3Darrow_forward1. A soil profile is shown in the figure. A uniformly distributed load of 75kPa is applied at the ground surface. The clay is normally consolidated. Compute the secondary settlement 8 years after the completion of primary consolidation. Time for completion of primary settlement is 2 years. Assume secondary compression index = 0.025arrow_forward
- 1. A soil profile is shown in the figure.A uniformly distribute d load of 50 Kpa is applied at the ground surface. Assume Cs= 1/5 Cc. What is the settlement of the clay layercaused by primary consolidation if: a. The clay is normally consolidate d b. The preconsolidation pre ssure, de= 210 Kpa c. The preconsolidation pressure, o.= 150 Kpa Ap = 50 kPa Sand 3 m Yay = 16 kN/m? Ground water table 6 m Sand Ya = 18.5 kN/m Clay Yar = 19 kN/m e = 0.95 LL = 50 8 m Sand Figure 06.4arrow_forwardWeight of structure W.T. Sand layer H2 Clay layer Н as Compacted sand- gravel layer figure 1arrow_forwardEstimate the primary consolidation settlement in the clay layer. Given: Ao= 85 kN/m²; H1 = 2 m; H2 = 4 m; and H3 = 6 m. Soil characteristics are as follows: Sand: e = 0.65; Gs = 2.66 • Clay: LL = 54; e = 0.98; Gs = 2.74 ; Cs = 1/6 Cc.arrow_forward
- How long will it take (in days) for a 3-foot clay layer in the field (double drained) to reach 60% consolidation? The coefficient of consolidation for the clay is 2.5 X 10-6 m2/min.arrow_forwardThe data in Table 1 shows the results from a consolidation test conducted on a specimen of clay. Table 1. Results from the consolidation test o'(kPa) e 50 100 200 400 800 400 200 100 200 400 800 1600 1.63 1.6 1.55 1.39 1.22 1.24 1.28 1.33 1.31 1.28 1.21 1.07 Draw the e-log o' graph. • Determine the compression index (Cr). a)Determine the recompression index (Cr).arrow_forwardQ5: Figure below shows a soil profile. The uniformly distributed load on the ground surface is Ao. Estimate the primary consolidation settlement of the clay layer given these values: HI = 1.5 m, H2 = 2 m, H3 = 2.5 m Sand: e = 0.62, Gs 2.62 Clay: e = 0.98, Gs = 2.75, LL = 50 Ao = 110 kN/m2 Sand Groundwater table Sand Clay Void ratio =e Hy Normally consolidated Sandarrow_forward
- Q2: For the soil profile and loading condition shown in Fig. (2). Find: a) Final consolidation settlement. b) Time required for the settlement to be (42) mm. c) The settlement after 2 years. 2 m 3 m 8 m Surcharge Aq=100 kPa Sand y=19.5 kN/m³ Sand Ysat 21 kN/m³ Clay Ysat = 19 kN/m³ eo=0.85 C₁ = 0.04 p=200 kN/m² Ce=0.2 C₁ = 3.4 m²/yr Rockarrow_forwardGiven the following data for the normally consolidated clay layer in the field. Compute the primary consolidation settlement. Thickness of clay layer= 3.0m Cc= 0.30 e= 0.70 Overburden pressure= 250 Kpa ΔP= 46 kPa Cα= 0.022arrow_forwardSurcharge, Aq-50 kN/m Sand 3 m Groundwater table V Tary-16 kN/m Sand 6m TR-18.5 kN/m Clay Tie-19 kN/m Void ratio, e=0.95 LL-50 6 m Sand FIGURE 02C)arrow_forward
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