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 11.9P
To determine
Find the degree of consolidation caused by the combination of vertical drainage and radial drainage.
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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
-
1. Under normal loading condition, a 3.6 m thick clay
(normally consolidated) has P, = 190 KPa and e, =1.22. A
surcharge of 190 KPa reduces its void ratio to 0.98. The
hydraulic conductivity of the clay for the loading range is
6.1 x 10ʻ m/day.
a. What is the coefficient of volume compressibility of the
clay?
b. What is the coefficient of consolidation of the clay?
c. How long will it take for this clay layer to reach 60%
consolidation if it is drained on one side only?
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
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
- 3. A layered soil is shown with the corresponding values K1, K2, and K3. a. Compute the equivalent horizontal coefficient of permeability b. Compute the equivalent vertical coefficient of permeability c. Compute the ratio of the equivalent horizontal coefficient of permeability to the equivalent vertical coefficient of permeability T H1= 3 m K1 =2 x 10 cm/s H2= 4 m K1 =3.2 x 10?cm/s H= 12 m H3= 5 m K1 =4.1 x 10 cm/sarrow_forwardC 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 = 0.2arrow_forwardb) For a normally consolidated laboratory clay specimen drained on both sides, the follow are given o'o =150 kN/m², e = eo = 1.1 •o'o+ Ao = 300 kN/m², e = 0.9 The thickness of clay specimen = 25mm Time for 50% consolidation = 2mm a) Determine the hydraulic conductivity of the clay for the loading range. %3D CR[5] b) How long (in days) will it take for a 1.8m clay layer in the field (drained on one side) to reach 60% consolidation.arrow_forward
- The saturated NC clay is 8 meters deep. The moisture content is 40% and the specific gravity is 2.5. If we know that loading increased the effective stress in the middle of the layer by 270 kpa, then answer the following questions. (cc = 0.2, Cs = 0.05) 1. Calculate the settlement after the consolidation. 2. Calculate the void ratio after consolidation. 3. Calculate the volume compressibility coefficient in terms of Kpa 4. If we unload the load that we applied, calculate the swelling and final void ratio. 5. If the effective stress increases after loading the soil again by 570 Kpa in the middle of the soil layer, calculate the consolidation settlement.arrow_forwardEvaluate the plastic settlement, in meter(s) on a layer of plastic clay due to an increase of pressure caused by loads above it under the ff. conditions: Initial intergranular pressure (ơ) = 200 kPa Increase in intergranular pressure (delta o) = 150 kPa Thickness of the clay layer = 10m Coefficient of consolidation (Cc) = 0.315 Void ratio of the clay (e) = 1.5 %3D %3D %3Darrow_forwardA clay layer 8 meter thick is subjected to a pressure of 70 kN/m². If the layer has a double drainage and undergoes 50% consolidation (T, = 0.196), in one year, determine the coefficient of consolidation? If the coefficient of permeability is 0.040 m/year, determine the settlement in one %3D year. Use Yw = 9.81 kN/m³.arrow_forward
- For a normally consolidated soil, the following is given: Determine the following: a. The compression index, Cc. b. The void ratio corresponding to pressure of 200 kN/m2arrow_forwardThe following data are given for normally consolidated clay: Thickness=2.6m Primary Cc=0.3 Secondary Cc=0.02 e=0.8 Average Pressure=127 kPa Change in pressure (vertical) =46 kPa Determine the following 1. Primary Consolidation Settlement (Ans. 58.17mm) 2. Secondary Settlement five years after the completion of the primary settlement. The time for completion of primary settlement is 1.5 years. (Ans. 15.4mm)arrow_forwardThe following data are given for overconsolidated clay: Gs=2.71 LL=45 Average Pressure=120 kPa e=0.8 thickness=4m Change in Pressure =40 kPa Cs=1/5 Cc Determine the following 1. Compression Index (Ans. 0.315) 2. Pre-consolidation Pressure (Ans. 92.9 kPa) 3. Primary Consolidation Settlement (Ans. 49 mm)arrow_forward
- 4. In a consolidated-drained triaxial test on a clay that is normally consolidated, the results are as follows: O3 = 15 lb/in 2 (Aoa)f = 11 lb/in? (Aua)f = 7.2 lb/in? a) Determine the consolidated-undrained friction angle. %3D b) Calculate the drained friction angle.arrow_forwardQ2: Available field data indicate that the permeahility for the clay is varies with depth. For layer 1: ku = 3.2 x 10 cmis; k = 1.1 x 10 cmis. For layer 2: kg - 1.7 x 10 em's; ka - 3.4 x 10" cm/s. For layer 3: kg - 1.4 x 10 cmis; ka - 44 x 10* cm/s. Compute the equivalent permeability for flow parullel and perpendicular to the clay layers shuwn in Fig.2. Layr 1 L 2 Layer a Fig.2 180 marrow_forwardFor 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 secondary compression settlement of the clay layer five years after the completion of primary consolidation settlement? (Note: Time for completion of primary settlement is 3 years.) Select the correct response: 0.7621" 0.4932 0.2363" 0.5524"arrow_forward
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