Concept explainers
Draw the plot for
Explanation of Solution
Given information:
The specific gravity of the loessial soil is
The liquid limit of the soil is
The dry density of the soil is
Calculation:
Refer to the Equation (11.5) in the textbook.
Consider the density of water is
Consider the liquid limit of 10.
Find the natural dry unit weight
Substitute
Tabulate the remaining calculated values as in Table 1.
LL | |
10 | 133.434 |
15 | 120.545 |
20 | 109.927 |
25 | 101.029 |
30 | 93.4626 |
35 | 86.9508 |
40 | 81.2874 |
Table 1
Draw the graph between liquid limit versus the natural dry unit weight as in Figure 1.
Mark the liquid limit of 24 corresponding to the dry unit weight of
Thus, collapse will occur.
Want to see more full solutions like this?
Chapter 11 Solutions
Principles of Foundation Engineering (MindTap Course List)
- 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_forwardQ#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/m? Secondary compression index = 0.02 Ao' = 46.5 KN/m? 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? Solution: 1. Де 2. Sc 3. ер. .4.C 5. Total Consolidation settlement.arrow_forward3. 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_forward
- 1. A specimen of sandy silt, when subjected to a drained triaxial test failed at major and minor principal stress of 1.20 kg/cm2 and 0.5 kg/cm2 respectively. At what value of deviator stress would another sample of the same soil fail, if it were subjected to an all-around pressure of 0.75 kg/cm2? a. 2.01 kg/cm2 b.2.34 kg/cm2 c. 1.89 kg/cm2 d. 1.05 kg/cm2arrow_forwardTake 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/6arrow_forwardA 5.1 m thick clay soil with a current overburden pressure of 89 kPa is going to experience an additional stress of 89 kPa after a new structure is built. If it was determined that the clay is normally consolidated has an initial void ratio of 1.2, a recompression index of 0.07, and a compression index of 0.47. Determine the total amount of settlement that is expected to occur. Provide your answer in meters to 3 decimal places.arrow_forward
- In the soil profile shown below, the water table is currently located at the ground surface (WT.1) and the clay layer has an OCR equal to 2.0. If the water table changes from level WT.1 to level WT.2 as depicted in the figure below, what is the new OCR in the middle of the clay layer a long time after the drawdown? (Acceptable tolerance = 2%, provide OCR value with 2 decimals).arrow_forwardA clay layer 5 m thick has double drainage. It was consolidated under a load of 127.5 kN/m2. The load is increased to 197.5 kN/m2. The coefficient of volume compressibility is 5.79 x 10^-4 m2/Kn and value of k = 1.6 x 10^-8 m/min. If the test sample is 2 cm thick and attains 100% consolidation in 24 hours, what is the time in days taken for 100% consolidation in the actual layer? a. 62,500 b. 60,000 c. 65,000 d.67,500arrow_forwardThe 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_forward
- A saturated undisturbed sample from a clay strata has moisture content of 22.22% and specific weight of 2.7. Assuming Yw = 10 kN/m3, the void ratio and the saturated unit weight of the clay, respectively are 200 kN V GWT 01 Saturated sand 1.0 m Ysat = 18 kN/m3 1.0 m 2 m x 2 m Stiff clay 1.0 m 00 Compression index, (C.) 0.4 Dense sandarrow_forwardA 3.75m clay layer in the field (drained on one side) is normally consolidated. When the pressure is increased from 50 kPa to 150 kPa, the void ratio decreases from 0.9 to 0.75. The coefficient of permeability of the clay was 6 x 10^-7 cm/s.• How long (days) will it take to reach 50% consolidation?• What is the settlement when the soil reaches 50% consolidation?Final answer should be in 3 decimal places.arrow_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 total consolidation settlement considering primary and secondary settlement. Select the correct response: 2.6425" 2.5631" 2.8866" 2.3856"arrow_forward
- Fundamentals of Geotechnical Engineering (MindTap...Civil EngineeringISBN:9781305635180Author:Braja M. Das, Nagaratnam SivakuganPublisher:Cengage Learning