Principles of Foundation Engineering (MindTap Course List)
9th Edition
ISBN: 9781337705028
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 12, Problem 12.37P
To determine
Find the consolidation settlement of the pile group
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12.37 Figure P 12.37 shows a group pile in clay. Determine the
consolidation settlement of the group. Use the 2:1 method to
estimate the average effective stress in the clay layers.
1335 KN
K-
3 m
++
3 m
*
18 m
5 m
3 m
↓
2.75 m
X 2.75 m
Group
plan
FIGURE P12.37
Groundwater
table
15 m
Rock
Sand
y = 15.72 kN/m²
Sand
Ysat = 18.55 kN/m³
Normally consolidated clay
Ysat = 19.18 kN/m³
€ = 0.8
C = 0.8
Normally consolidated clay
Ysat = 18.08 kN/m³
% = 1.0
C = 0.31
Normally consolidated clay
Ysat = 19.5 kN/m³
€ = 0.7
C₂ = 0.26
8. Plot the consolidation curve for the data given below and determine the preconsolidation
stress (o'c). Note: tsf = tons per square foot.
tsf
e
0.25 0.93
0.5
0.92
0.9
2
0.88
4 0.84
1
8 0.75
16 0.59
32 0.38
4 0.43
1
0.48
9. For the plot in problem 8, determine Cr and Cc.
9. The following are the details for the backfill material
in a vibroflotation project.
D10=0.36 mm
D20 0.52 mm
D25=0.60 mm
D50=1.42 mm
D75 1.65 mm
a. Find the suitability number.
b. Determine the rating.
c. Determine the sorting coefficient.
Chapter 12 Solutions
Principles of Foundation Engineering (MindTap Course List)
Ch. 12 - Prob. 12.1PCh. 12 - A 20 m long concrete pile is shown in Figure...Ch. 12 - A 500 mm diameter are 20 m long concrete pile is...Ch. 12 - Redo Problem 12.3 using Coyle and Castellos...Ch. 12 - A 400 mm 400 mm square precast concrete pile of...Ch. 12 - Determine the maximum load that can be allowed on...Ch. 12 - A driven closed-ended pile, circular in cross...Ch. 12 - Consider a 500 mm diameter pile having a length of...Ch. 12 - Determine the maximum load that can be allowed on...Ch. 12 - Prob. 12.10P
Ch. 12 - Prob. 12.11PCh. 12 - Prob. 12.12PCh. 12 - A concrete pile 16 in. 16 in. in cross section is...Ch. 12 - Prob. 12.14PCh. 12 - Solve Problem 12.13 using Eqs. (12.59) and...Ch. 12 - Prob. 12.16PCh. 12 - Prob. 12.17PCh. 12 - A steel pile (H-section; HP 310 125; see Table...Ch. 12 - Prob. 12.19PCh. 12 - A 600 mm diameter and 25 m long driven concrete...Ch. 12 - Redo Problem 12.20 using Vesics method, assuming...Ch. 12 - Prob. 12.22PCh. 12 - Prob. 12.23PCh. 12 - Solve Problem 12.23 using the method of Broms....Ch. 12 - Prob. 12.25PCh. 12 - Solve Problem 12.25 using the modified EN formula....Ch. 12 - Solve Problem 12.25 using the modified Danish...Ch. 12 - Prob. 12.28PCh. 12 - Prob. 12.29PCh. 12 - Figure 12.49a shows a pile. Let L = 15 m, D (pile...Ch. 12 - Redo Problem 12.30 assuming that the water table...Ch. 12 - Refer to Figure 12.49b. Let L = 18 m, fill = 17...Ch. 12 - Estimate the group efficiency of a 4 6 pile...Ch. 12 - The plan of a group pile is shown in Figure...Ch. 12 - Prob. 12.35PCh. 12 - Figure P12.36 shows a 3 5 pile group consisting...Ch. 12 - Prob. 12.37P
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- H.W. Following are the results of a consolidation test: Pressure, p (kN/m) Void ratio, e 0.25 1.1 0.5 1.085 1.0 1.055 1.01 2.0 4.0 0.94 8.0 0.79 16.0 0.63 1-Plot the e-log P curve, then 2- Using Casagrande's method, determine the precosolidation pressure,Pc. 2- Calculate the compression index, Ccarrow_forwardlayer. 2. A project with excavation and construction stages will take place at your site. The profile contains a saturated clay On March 1, the effective stress at point A (in the middle of the clay layer) is 150 kPa, and the overconsolidation ratio is 1. On April 1, the effective stress at point A is 140 kPa. On May 1, the effective overconsolidation ratio on May 1? Show your work and circle your answer. stress at point A is 290 kPa. What is thearrow_forwardWould the following separate, unrelated actions cause consolidation settlement in a clay layer? Answer Yes or No and describe why. A) Only adding a wide surface load of great pressure (e.g. embankment). B) Only drilling a vertical pipe throughout a clay layer. C) Only drawing down the water table by dewatering through the vertical pipe.arrow_forward
- 46. Consolidation of Clay: Given Exercise Figure 7.4 and the accompanying information, what is the ultimate settlement in the clay under the applied load? Note: 1 ft = 0.3048 m; 62.4 lb/ft³ = 1 Mg/m³. Assuming the sand will not settle, determine the ulti- mate settlement in the clay using: Proceeding in steps: a. Determine the effective stress for the cross section prior to loading. Show the stresses at depth using an appropriate diagram. b. What is Ao' on the clay layer caused by the imposed load? (Hint: Calculate this for the center of the clay layer at 5.8 m [19 ft] deep.) (ft) 0 c. What is the value of eo based on the original poros- ity of the clay? d. How much settlement will occur in the clay? 5 H ΔΗ =· -C log 1+- 1+e 16 22 40' o' P= 125 tons Sand: Yd=105 lb/ft³ Silty sand: Ysat Clay: Ysat=121 lb/ft³ n = 0.629, C = 0.82 Exercise Figure 7.4 = 127 lb/ft³ GWTarrow_forwardRefer to Figure 18.26b. Let L = 15.24 m, fill = 17.29 kN/m3, sat(clay) = 19.49 kN/m3, clay = 20, Hf = 3.05 m, and D = 0.406 m. The water table coincides with the top of the clay layer. Determine the total downward drag on the pile. Assume that = 0.6 clay. FIG. 18.26 Negative skin frictionarrow_forwardThe results of a laboratory consolidation test on a clay sample are given below: Pressure, p (kN/m²) Void ratio, e 23.94 1.112 47.88 1.105 95.76 1.080 191.52 0.985 383.04 0.850 766.08 0.731 (43) a) Draw an e-log p plot. (44) b) Determine the pre-consolidation pressure, p. . (45) c) Find the compression index, Ce. Appendix For ø=35°, N¸=57.8, N,=41.4, and N,=41.1. o,'=0;'tan²| 45°+ +2c tan| 45°+arrow_forward
- 11.12 A 2-m clay layer in the field has a current effective stress, o= 70 kN/m. There is a net stress increase, Ao = 180 kN/m², due to a foundation load. Calculate the expected primary consolidation settlement. The results of a consolidation test on the clay are given below. o' (kN/m?) e 0.98 12 0.94 50 0.82 200 0.73 400 © Cengage Leaming 2014arrow_forwarda. The following are the results of a consolidation test. Pressure o' (kN/m²) 480.. e 1.21 1.195 1.15 1.06 0.98 0.925 25 50 100 200 400 500 1. Plot the e-log o' curve. (use a French curve to construct) 2. Using Casagrande's graphical method, determine the preconsolidation pressure. 3. Calculate the compression index, Cc, from the laboratory e-log o' curve.arrow_forwardA circular foundation 2m in diameter is shown in the figure below. A normallyconsolidated clay layer 5m thick is located below the foundation. Determine the consolidation settlement of the clay. 1- method 2:1 2- consolidation settlement Cc methodarrow_forward
- The backfill material for a vibroflotation project has the following grain sizes: D10 = 0.11 mm, D20 = 0.19 mm, D50 = 1.3 mm. Determine the suitability number.arrow_forwardA DMT was performed in a normally consolidated clay at a depth of 10 m, giving a KD of 2.1.The clay has a unit weight of 118 lb/ft3 , and the groundwater table is at the ground surface. Estimate the undrained shear strength of the clay at a depth of 10 m.arrow_forwardShow full solutions and informative drawings. 1. Determine the average pressure using Simpon's rule 2. Determine the primary consolidation settlement of the clay layer if it is normally consolidated. NOTES: Correction in the figure. Gs is not 45. The liquid limit is 45. The footing is a square footing 3m x3marrow_forward
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