consolidated clay located below ground surface has 3 m thickness and voic Uniform load is acting on the ground surface = 40 kPa. Ave. effective stress at the top of clay = 56 kPa Ave. effective stress at the midpoint of clay = 80 kPa Pre-consolidation pressure = 130 kPa Compression Index = 0.45 Swell Index=0.06

consolidated clay located below ground surface has 3 m thickness and voic Uniform load is acting on the ground surface = 40 kPa. Ave. effective stress at the top of clay = 56 kPa Ave. effective stress at the midpoint of clay = 80 kPa Pre-consolidation pressure = 130 kPa Compression Index = 0.45 Swell Index=0.06

Principles of Foundation Engineering (MindTap Course List)

9th Edition

ISBN:9781337705028

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter2: Geotechnical Properties Of Soil

Section: Chapter Questions

Problem 2.12P

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A normally consolidated clay layer 3 m thick has a void ratio of 1.10. Liquid limit is equal to 40 and the average effective stress on the Clay layer was 80 Kpa The average stress on it is increased to 120 Kpa as a result of construction of a foundation. a. Compute for the consolidation settlement that will occur on the clay layer b. Compute for the consolidation settlement that will occur on the clay layer if preconsolidation pressure is 96Kpa. c. Compute for the consolidation settlement that will occur on the clay layer if preconsolidation pressure is 130 KPa.
11.12 A 2-m clay layer in the field has a current effective stress, oó= 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) 0.98 12 0.94 50 0.82 200 0.73 400 ©Cngage lamng 2014
Estimate the primary consolidation settlement of the clay in centimeters from a 28,000 kN load on an 8m by 10 m footing. The subsurface consists of a 10 meter thick layer of sand and gravel overlying a 4 meter thick layer of normally- consolidated clay (OCR=1). Assume sand and gravel layers do not settle. Below the soft clay is sand and gravel. Water table is 3 meters deep. Subsurface properties are below: W= 28 x 10 N 28 10 g maris) Footer 10 mBm moist=19.5 kN/cubm Water level Sand and gravel Y sat-19.6 kN/cub m y sat-19.4 N/cub m 4 m Clay Sand and gavel 1) Thickness of normally-consolidated clay = 4 meters 2) Water table is 3 meters deep 3) Sand and Gravel y moist=19.5 kN/cubic meter, y saturated= 19.6 kN/cubic meter 4) Soft Clay (OCR=1) a. Initial void ratio of clay layer (e o) = 0.81 b. y sat= 19.4 kN/cubic meter c. Compression Index of clay Cc=0.62 d. Swell Index of clay Cs = 0.12
The 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)
A normally consolidated clay layer of 4 m in thikness has overburden stress of 96.7 kPa and final effective stress of 154.3 kPa. If Cr = 0.22 and void ratio = 1.1 the consolidation settlement would be: %3D O A. 173.0 mm O B. 178.3 mm O C. 172.3 mm O D. 175.3 mm QUESTION 12 The liquid and plastic limits of a clay are 48% and 23% respectively. The specific gravity is 2.7. Estimate the following: - Cc - Cr Then select the correct answers. O A. Cc = 0.33 Cr = 0.66 O B. Cc = 0.34 Cr = 0.06 O C. Cc = 0.30 Cr = 0.16 O D. Cc = 0.06 Cr = 0.34
2- An undisturbed clay has a preconsolidation pressure of 200 lb/ft. A laboratory consolidation tests yield the following data: o' (lb/ft') e 0.92 3,130 6,270 0.77 a) Determine the void ratio that corresponds to a pressure of 5,800 (Ib/ft). b) Determine the coefficient of volume compressibility for the pressure range stated. c) If C, = 1 x 10* in?/sec, determine hydraulic conductivity, k in in/sec corresponding to the average void ratio within the pressure range.
Refer to Figure 11.41. Given that B =1 m, L = 3 m, and Q = 110 kN, the soil characteristics given in the figure are Cs = 1/5 Cc, Ꝺ’c= 40 kN/m2. Field monitoring indicated that the foundation settlement was 19 mm during the first 12 months. a. Estimate the average stress increase in the clay layer due to the applied load. b. Estimate the primary consolidation settlement. c. What is the degree of consolidation after 12 months? d. Estimate the coefficient of consolidation for the pressure range. e. Estimate the settlement in 24 months. Answer must be: A. 6.33 B. 32.82 C. 57.89 D. 0.0013 E. 25.66
Estimate the ultimate consolidation settlement under the centerline of a 15 X 15 m mat foundation. The mat is 1 m thick reinforced concrete and the average stress on the surface of the slab is 75 kPa. The soil profile is shown below. Oedometer tests on samples of the clay provide these average values. ’p = 130 kPa, Cc = 0.40, Cr = Cs = 0.03 Neglect any settlements due to the sand layer. Please and thank you!! :)
11.11 An undisturbed clay has a preconsolidation pressure of 100 kN/m. A laboratory consolidation tests yield the following data: o' (kN/m?) e 0.92 0.77 150 300 Determine the void ratio that corresponds to a pressure of 450 kN/m?. DCengage Learing 2014
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 2014
13. Situation 13 - The soil is acted upon by a uniformly distributed load ΔP = 60 kPa at the ground surface. a. Compute the settlement of the clay layer, in mm, caused by primary consolidation if the preconsolidation pressure of clay is 230 kPa. Use Cs = Cc/5. Round off to the nearest whole number. b. Compute the settlement of the clay layer, in mm, caused by primary consolidation if the clay is normally consolidated. Round off to the nearest whole number. c. Compute the settlement of the clay layer, in mm, caused by primary consolidation if the preconsolidation pressure of clay is 200 kPa. Use Cs = Cc/5. Round off to the nearest whole number.
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°+