Principles of Foundation Engineering (MindTap Course List)
8th Edition
ISBN: 9781305081550
Author: Braja M. Das
Publisher: Cengage Learning
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Chapter 2, Problem 2.27P
(a)
To determine
Find the soil friction angle
(b)
To determine
Find the soil friction angle
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Refer to Problem 3.5. Using Eq. (3.28), determine the averagerelative density of the sand. Assume it is a fine sand.Use Eq. (3.13) to obtain (N1)60.
A normally consolidated clay has the following values void ratio e = 1.2, k(cm/sec) = 0.2 x 10^-6
And void ratio e = 1.9, 0.91x10^-6. Estimate the magnitude k of the clay at a void ratio (e) of 0.9. Use k = C (e^n)/1+e.
Estimate the vertical coefficient of permeability for a uniform clay deposit where representative test results are as shown:
LL = 92, PL = 34
percent of clay size particles in the soil =40
void ratio ( approximate ) = 1.75
Chapter 2 Solutions
Principles of Foundation Engineering (MindTap Course List)
Ch. 2 - Prob. 2.1PCh. 2 - Prob. 2.2PCh. 2 - Prob. 2.3PCh. 2 - Prob. 2.4PCh. 2 - Prob. 2.5PCh. 2 - Prob. 2.6PCh. 2 - Prob. 2.7PCh. 2 - Prob. 2.8PCh. 2 - Prob. 2.9PCh. 2 - Prob. 2.10P
Ch. 2 - Prob. 2.11PCh. 2 - Prob. 2.12PCh. 2 - Prob. 2.13PCh. 2 - Prob. 2.14PCh. 2 - Prob. 2.15PCh. 2 - For a normally consolidated soil, the following is...Ch. 2 - Prob. 2.17PCh. 2 - Prob. 2.18PCh. 2 - Prob. 2.19PCh. 2 - Prob. 2.20PCh. 2 - Prob. 2.21PCh. 2 - Prob. 2.22PCh. 2 - Prob. 2.23PCh. 2 - Prob. 2.24PCh. 2 - Prob. 2.25PCh. 2 - Prob. 2.26PCh. 2 - Prob. 2.27P
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- 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_forwardRefer to Problem 3.4. Using Eq. (3.28), determine the average relative density of the sand. Assume it is a fine sand. Use Eq. (3.13) to obtain (N1)60.arrow_forwardA layered soil is shown in the figure below. Given that H1 = 1 m, k1 = 10-4 cm/sec H2 = 1 m, k2 = 2.8 x 10-2 cm/sec H3 = 2 m, k3 = 3.5 x 10-5 cm/sec Estimate the ratio of equivalent permeability, kH(eq)/kV(eq).arrow_forward
- A layered soil is shown in Figure 7.33. Given: • H1 = 1.5 m k1 = 9 × 104 cm/sec• H2 = 2.5 m k2 = 7.8 × 10−3 cm/secarrow_forwardan undisturbed 1200 cm^3 sample of sand weighs 19.5 N when dry. The void ratios at the maximum and minimum unit weight were determined to be 0.43 and 0.92. The specific gravity of solids is known to be 2.73. Calculate the dry unit weight of sand in kN/m^3arrow_forwardFor a constant laboratory permeability test on a fine sand, the following data are given: Length of specimen: 18 cm. Diameter of specimen: 95 mm. Constant head difference: 54 cm. Volume of water collected in 4.10 min.: 423 cc Void ratio of the soil specimen: 0.54 Determine the seepage velocity in m/min.arrow_forward
- Q#3: For a normally consolidated clay layer in the field, the following values are given. Thickness of clay layer = 2.6 m Compression index = 0.28 Average effective pressure on clay layer 127 KN/m² Secondary compression index = 0.02 Δσ’ = 46.5 KN/m² Void ratio = 0.8 Time of Primary settlement = 1.5 years What is the total consolidation of the clay layer five years after the primary consolidation settlement?arrow_forwardQuestion 34 A three-layer soil has the following properties: Layer 1: k = 2.72 x 10^-3 cm/s, H = 3.02 m. Layer 2: k = 1.7 x 10^-2 cm/s, H = 4.93 m. Layer 3: k = 3.16 x 10^-3 cm/s, H = 4.04 m. Determine the equivalent vertical coefficient of permeability of the soil arrangement. Layer 1 is on top of layer 2 while layer 2 is on top of layer 3. Round off to four decimal places.arrow_forwardThe results of a constant-head permeability test for a fine sand sample having a diameter of 70 mm and a length of 140 mm are as follows (refer to Figure 7.5):• Constant-head difference = 550 mm• Water collected in 7 min = 450 cm3• Void ratio of sand = 0.8Determine:a. Hydraulic conductivity, k (cm/sec)b. Seepage velocityarrow_forward
- In a deposit of normally consolidated dry sand a cone penetration test was conducted. Following are the result: Depth(m) Point resistance of cone, qc (MN/m²) 1.5 2.06 3.0 4.23 4.5 6.01 6.0 8.18 7.5 9.97 9.0 12.42 Assuming the dry unit weight of sand to be 16kN/m³, estimale the average peak friction angle, ф’, fo the sand. Use ф’=tan ¯1((0.38+0.27log(qc/ σ’o))arrow_forwardThe max and min dry unit weights of sand were determined in the laboratory to be 18.31KN/M3 and 15.25KN/M3 respectively.Determine the dry unit weight in the field if the relative density is 0.64.arrow_forwardA sand is densified by compaction at a site so that the void ratio changes from 0.80to2.70. what is the increase (change) in dry unit weight of the sand in kN/m^3?arrow_forward
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