Principles of Foundation Engineering, SI Edition
8th Edition
ISBN: 9781305723351
Author: Braja M. Das
Publisher: Cengage Learning US
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Chapter 7, Problem 7.15P
To determine
Find the consolidation settlement of the clay layer.
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In the laboratory test on a clay sample of
thickness 25mm, drained at top only, 50%
consolidation occurred in 11 minutes. Assume
= 0.197, T = 0.405. Find the time required
for the corresponding clay layer in the field of 3m
thick and drained at top and bottom to undergo
50% consolidation. Also, find the time required to
undergo 70% consolidation.
TE
%3D
70
50
Data from an oedometer test using a clay specimen are plotted in the graph shown below. If the compression index is equal to 0.6, calculate the void ratio (e2) missing at Point C, which is associated with a vertical effective stress equal to 105 kPa
Н.W
1. For the one-dimensional consolidation test result shown in Figure below,
determine my.
1.0
0.9
0.8
Void ratio
0.7
0.6
0.5
0.4
10,000
Vertical effective stress (log scale) - psf
100
1000
100,000
2- The following readings were taken for an increment of vertical stress of 400
psf in a one-dimensional consolidation test on a saturated clay sample 3 in
diameter and 0.75 in thick. Drainage was permitted from the top and bottom
boundaries. Determine the coefficient of consolidation using the root time
method.
Time (min) 0.25
ΔΗ (in)
1
2.25
4
9.
16
25
36
64
144
24 hours
0.0047 0.009 0.0133 0.0169 0.023 0.0268 0.0291 0.03 0.032 0.033 0.035
Chapter 7 Solutions
Principles of Foundation Engineering, SI Edition
Ch. 7 - Prob. 7.1PCh. 7 - A planned flexible load area (see Figure P7.2) is...Ch. 7 - Prob. 7.3PCh. 7 - Prob. 7.4PCh. 7 - Prob. 7.5PCh. 7 - Prob. 7.6PCh. 7 - Prob. 7.7PCh. 7 - Prob. 7.8PCh. 7 - Solve Problem 7.8 using Eq. (7.29). Ignore the...Ch. 7 - A continuous foundation on a deposit of sand layer...
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- 9.18 Fig. P9.18 shows the soil profile at a site for a proposed office building. It is expected that the vertical stress at the top of the clay will increase by 150 kPa and at the bottom by 90 kPa. Assuming a linear stress distribution within the clay, calculate the consolidation settlement. [ Hint: You should divide the clay into five equal layers, compute the settlement for each layer, and then find the total settlement.] Groundwater level is at the top of the clay layer. An oedometer test on a sample of the clay revealed that the time for 90% consolidation on a 20 mm thick sample occurred in 40 minutes. The sample was drained on the upper and lower boundaries. How long will it take for 50% consolidation to occur in the field? w = 23% 5 m S = 90% Sand w = 40% 10 m C=0.3 OCR = 1 Clay Impervious rock FIGURE P9.18arrow_forwardFollowing are the results of a consolidation test on a sample of undisturbed clay obtained from the field. Pressure ơ' (kN/m²) Final Height of Specimen (mm) 24 10 23.78 20 23.30 50 22.22 100 20.58 200 19.04 400 17.52 800 16.31 17.75 The height of the specimen at the beginning of the test was 24 mm and the area of specimen was 50 cm? volume of specimen was 120 cm³. The mass of dry specimen was 180.4 g. Gs= 2.68. 1. Plot the e-log ơ' curve, 2. Using Casagrande's method, determine the preconsolidation pressure. 3. Calculate the compression index, Ccarrow_forwardHow long will it take for 50% of the total settlement to occur in laboratory specimen of the clay tested in a conventional consolidation oedometer, if the specimen is 6.35cm in diameter and 2.54 cm thick? Cv=0.25 m2/day. 33sec 55sec O 66sec 44 secarrow_forward
- 1. Triaxial compression tests are done on quartzite rocks, the results are shown below. (0₁+03)/2 -964.25 14500 19575 23200 29000 43210 63075 psi (01-03)/2 964.25 14500 18850 21750 26100 35960 48575 psi Comment on the applicability of each of the Mohr-Coulomb, Griffith, and Hoek-Brown criteria for the testing results.arrow_forwardx in red is equal to 39arrow_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_forward
- F1arrow_forwardRedo Problem 11.6 using the weighted average method [Eq. (11.68)] to calculate the stress increase in the clay layer. Problem 11.6 Refer to Figure 11.43. Considering the soil to be a uniform clay layer, estimate the primary consolidation settlement due to the foundation load. Given: P = 150 kN; B = 3 m; L = 3 m; D, = 1.5 m; H = 8 m; e = 0.7; G, = 2.72; and LL = 42. Assume that the clay is normally consolidated, and the groundwater P table is at the foundation level. Use Ao = BL Figure 11.43 Foundation BxL Ao Soil H, = Poisson's ratio E, = modulus of elasticity H %3D Rock Figure 11.43 ©Cengage Leam ing 2014arrow_forwardA 30 mm thick oedometer sample of clay reached 30% consolidation in 15 minutes with drainage at top and bottom. How many years would it take the clay layer from which this sample was obtained to reach 60% consolidation? The clay layer had one-way drainage and was 6 m. thick. a. 16.24 b. 18.27 c. 12.56 d. 14.78arrow_forward
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