Foundation Design: Principles and Practices (3rd Edition)

3rd Edition

ISBN: 9780133411898

Author: Donald P. Coduto, William A. Kitch, Man-chu Ronald Yeung

Publisher: PEARSON

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Textbook Question

Chapter 3, Problem 3.11QPP

A 2m thick fill is to be placed on the soil shown in Figure 3.21. Once it is compacted, this fill will have a unit weight of

Figure 3.21

Soil profile for Problem 3.11.

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Students have asked these similar questions

For
the soil profile given below, assume that the primary consolidation settlement for the
clay layer is completed in 3 years. Estimate the secondary consolidation settlement for the
clay layer at the end of 10 years. Yw= 10kN/m³, Ca= 0.03
1m
1.5m
2m
BxL= 2m x 4m
Groundwater table
0.5m
90 = 100kPa
Sand
y = 17.0 kN/m³
Sand
Ysat 19.0 kN/m³
a retaining wall are shown in
Normally consolidated Clay
Ysat 20 kN/m³
eo = 0.7
Cs=0.09 Cc = 0.2

THE FIGURE SHOWS A SOIL FORMATION OF 5M SAND AND 6M CLAY. THE GROUNDWATER TABLE IS 4M BELOW THE GROUND SURFACE. IF A FILL WITH A UNIT WEIGHT OF 17KN/M3 AND A HEIGHT 2M IS PLACED ON THE GROUND, FIND:
A. THE PRIMARY CONSOLIDATION SETTLEMENT OF THE CLAY LAYER IF IT IS NORMALLY CONSOLIDATED WITH A COMPRESSION INDEX OF 0.38 AND A VOID RATIO OF 1.52.B. THE TOTAL CONSOLIDATION SETTLEMENT OF THE CLAY 5 YEARS AFTER THE COMPLETION OF PRIMARY CONSOLIDATION SETTLEMENT. TIME FOR COMPLETION OF PRIMARY SETTLEMENT IS 2 YEARS. SECONDARY COMPRESSION INDEX IS 0.02

10.17 A 4.0 m thick fill is to be made of a soil with a Proctor maximum dry unit weight of
19.4 kN/m² and an optimum moisture content of 13.0%. This fill will be compacted at
optimum moisture content to an average relative compaction of 92%. The underlying
soils are as shown in Figure 10.26. Consolidation tests were performed at Points A and B,
with the following results:
Sample
A
Сс
0.59
Cr ୧୦
0.19 1.90
σ (kPa)
75
B
0.37 0.14
1.21
100
The silty sand is normally consolidated.
Using hand computations, determine the
ultimate consolidation settlement due to the weight of this fill.

# Chapter 3 Solutions

Foundation Design: Principles and Practices (3rd Edition)

Ch. 3 - Explain the difference between moisture content...Ch. 3 - A certain saturated sand has a moisture content...Ch. 3 - Consider a soil that is being placed as a fill and...Ch. 3 - A sample of soil has a volume of and a weight of...Ch. 3 - A site is underlain by a soil that has a unit...Ch. 3 - The sub-surface profile at a certain site is shown...Ch. 3 - A vertical load of 300 kN is applied to a area at...Ch. 3 - A vertical load of 20 k is applied to a area at...Ch. 3 - 3m3m footing is to be built on the surface of a 15...Ch. 3 - A 3 ft square footing carries a sustained load of...

Ch. 3 - A 2m thick fill is to be placed on the soil shown...Ch. 3 - Estimate the effective friction angle of the...Ch. 3 - Explain the difference between the drained...Ch. 3 - A soil has c=5 kPa and =32. The effective stress...Ch. 3 - A footing with an embedment of 2 m is embedded in...Ch. 3 - Prob. 3.16QPPCh. 3 - Prob. 3.17QPPCh. 3 - A 9 ft thick fill is to be placed on the soil...

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- 5. For the soil profile given below, assume that the primary consolidation settlement for the clay layer is completed in 3 years. Estimate the secondary consolidation settlement for the clay layer at the end of 10 years. Yw= 10kN/m³, Ca = 0.03 1m 1.5m 2m Groundwater table 0.5m BXL = 2m x 4m Sand y = 17.0 kN/m³ 90 = 100kPa Sand Ysat = 19.0 kN/m² Normally consolidated Clay Ysat = 20 kN/m³ eo = 0.7 Cs = 0.09 Cc = 0.2 -
*arrow_forward*The 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*C 5. For the soil profile given below, assume that the primary consolidation settlement for the clay layer is completed in 3 years. Estimate the secondary consolidation settlement for the clay layer at the end of 10 years. Yw= 10kN/m³, Ca = 0.03 t 1m 1.5m 2m Groundwater table 0.5m 90 = 100kPa BXL = 2m x 4m Sand y = 17.0 kN/m³ Sand Ysat = 19.0 kN/m³ = Normally consolidated Clay Ysat = 20 kN/m³ eo = 0.7 Cs= 0.09 Cc = 0.2*arrow_forward* - For a normally consolidated clay layer in the field, the following values are given: Thickness of clay layer = 8.5 ft ● Void ratio = 0.8 ● ● ● ● Compression index (CC) = 0.28 Average effective pressure on the clay layer is 2650 lb/ft² Additional Overburden Pressure is 970 lb/ft² Secondary compression index (Ca) is 0.02 Determine the total consolidation settlement considering primary and secondary settlement. Select the correct response: 2.6425" 2.5631" 2.8866" 2.3856"
*arrow_forward*Compressibililty: Consolidation and Settlement of Soil 500 kN 4m x 3m 3.5m Dry Sand = 15 kN/m Yary Sand Y = 17 kN/m³ 1.5m Clay = 19 kN/m Ysat e. = 1.0 LL = 50% 4.5m 2. Find the total consolidation settlement of the clay 4 years after the completion of primary consolidation settlement. The time for the completion of the primary consolidation settlement is 3 years. Ca = 0.020 (E; = 18 MPa, Poisson's Ratio = 0.20, I = 1.0)*arrow_forward*Take a look at the figure below. Estimate the primary consolidation settlement in the clay layer. The increase in stress is 85 kN/m2, H1 = 2m, H2 = 4m and H3 = 6m. Soil characteristics are as follows:• Sand: e = 0.65; Gs = 2.66• Clay: LL = 54; e = 0.98; Gs = 2.74; pre-consolidation stress = 150 kN/m2; Cs = Cc/6*arrow_forward* - Two identically clay samples of the same size designated as A and B are subjected to consolidation under identical conditions. Drainage takes place through one face in sample A and through both the faces in sample B. 50% consolidation of sample A occurs in 10 minutes. The time required for 50 % consolidation to occur in sample B in minutes will be. (a) 40 (c) 5 (b) 10 (d) 2.5
*arrow_forward*The following consolidation test data were obtained from an undisturbed clay specimen. Pressure (kPa) Void ratio 20 0.958 40 0.948 80 0.938 160 0.92 320 0.878 640 0.789 1280 0.691 320 0.719 80 0.754 20 0.791 1 0.89 (a) Plot the void ratio vs. the consolidation pressure curve on semilogarithmic graph paper, and estimate the pre-consolidation pressure o. (b) Determine the compression index C, for the virgin compression and the rebound index C, for the unloading starting at 1280 kPa. (c) Calculate the coefficient of volume compressibility m, for the virgin compression.*arrow_forward*A certain clay layer has thickness of 5 m. After 1 year, when the clay was 50% consolidated, 8 cm of settlement had occurred. For a similar clay and loading conditions. If the thickness of new layer is 25 m, final settlement for the second clay sample is 24 cm, (Assume single drainage in both cases.) Find Coefficient of consolidation of clay Final consolidation settlement Settlement at the end of 1 year*arrow_forward* - A large area of 2-m high fill is placed on a normally-consolidated homogeneous sedimentary clay for preloading. The unit weight of the fill is 19.2 kN/m'. The undrained shear strength of the natural soil is 20 kPa. The new undrained shear strength of the soil when the degree of consolidation reached 80% is: 20.0 kPa O 23.5 kPa 26.8 kPa 28.4 kPa 29.6 kPa
*arrow_forward*The laboratory consolidation test is conducted on a clay sample. The following data results were obtained P1 =55 kPa P2 = 130 kPa e1= 0.95 e2= 0.80 Thickness of the sample of clay= 35mm Time for 50% consolidation = 3.0 min Tv= 0.197 a. Find the coefficient of volume compressibility b. Determine the coefficient of consolidation if a sample of clay was drained on both sides c. Compute the hydraulic conductivity of the clay*arrow_forward*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*arrow_forward*

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