Principles Of Foundation Engineering, Si Edition
8th Edition
ISBN: 9781305081567
Author: Braja M. Das
Publisher: Cengage Learning
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Chapter 2, Problem 2.13P
To determine
Calculate the consolidation settlement for the clay when the average effective stress on the clay layer increase.
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For a normally consolidated clay layer, given:Thickness = 3.7 mVoid ratio = 0.82Liquid limit = 42Average effective stress on the clay layer 5 110 kN/m2 How much consolidation settlement would the clay undergo if the average effective stress on the clay layer is increased to 155 kN/m2 as the result of the construction of a foundation?
A normally consolidated clay layer 3.25 m. thick has a void ratio of 1.11. Liquid limit is equal to 36 and the average effective stress on the clay layer was 83 kPa. The average stress on it is increased to 115 kPa. as result of the construction of a foundation. Compute the consolidation settlement in millimeters that the clay undergo
A stratum of clay is 2m thick and has an initial vertical effective stress of 50 KN/m2. The foundation load caused an increased pressure of 40 KN/m2 at the mid-layer of clay. Consolidation test revealed the following results: overconsolidation ratio (OCR) = 1.5 Compression index = 0.25 Recompression index = 0.05 Secondary compression index = 0.02 Initial void ratio = 0.90 Determine the following
a. the primary consolidation settlement of the clay layer (in mm).
b. If the primary consolidation settlement took 2 years to achieve in the field, calculate the secondary consolidation settlement after a period of 5 years (in mm).
c. the preconsolidation pressure (in KPa.
Note: Kindly give all right solutions with clear calculations.
Chapter 2 Solutions
Principles Of Foundation Engineering, Si Edition
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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- Assume a buried stratum of clay 1.83 m thick will be subjected to a stress increase of 44.6 kPa at the center of the clay. The magnitude of the pre-construction soil overburden pressure P0= 48 kPa at the center of the clay layer. A laboratory compression test indicates that the clay has a pre-consolidation pressure of 72 kPa. The compression index is 0.30 and the value of the swell index is 0.05. The void ratio of clay is 1.50. a. Compute the settlement due to primary compression of clay.b. If full consolidation settlement will require approximately 8 years, compute the settlement due to secondary compression of clay over a period of 20-year time span. Assume secondary compression index 0.008.c. Estimate the total settlement to be expected over a 20-year time span considering the effect of secondary compressionNote: Draw Free Body- Diagram, Use 3 decimal Places Do not copy the one in chegg, it is incomplete Topic: Compressibility of Soil (Soil Mechanics)arrow_forwardassume a buried stratum of clay 1.83 m thick will be subjected to a stress increase of 33.6 kpa at the center of clay. the magnitude of the pre-construction soil overburden pressure is 48 kpa at the center of the clay layer. a laboratory compressiontest indicates that the clay has a pre-consolidation pressure of 72 kpa. compression index is 0.3 and the value of swell index is 0.05. the void ratio of clay is 1.5.compute the settlement due to primary compression of clay.arrow_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
- 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.arrow_forwardA layer of soft clay having an initial void ratio of 1 is 9m thick. Under a compressive load appliedarrow_forward12. A stratum of clay 1.8 m thick below an incompressible soil will be subjected to a stress increase of 36 kPa. The magnitude of the preconstruction soil overburden pressure in laboratory compression tests indicates that the clay is overconsolidated with a preconsolidation pressure equal to 72 kPa. The value of the compression index Cc= 0.30 and the swell index is equal to 0.05, void ratio of the clay is 1.50. Determine the change in thickness in the clay layer due to this conditionarrow_forward
- Given that for an over-consolidated clay soil deposit, the pressure under which the deposit has been fully consolidated in the past is 125 kN/m², and the present overburden pressure is 75 kN/m². The over-consolidation ratio of the soil deposit is:arrow_forwardA stratum of clay1.80 meters thick below an incompressible soil will be subjected to a stress increase of 36 kPa at the center of the layer. The magnitude of the pre-construction soil overburden pressure is 68 kPa at the center of the layer. A laboratory compression tests indicates that the clay is overconsolidated with a preconsolidation pressure equal to 80kPa. The value of the compression index, Cc=0.30 and the swell index is 0.05. The void ratio of the clay is 1.50. Determine the settlement of the clay layer due to this condition.arrow_forwardA soil profile consists of a sand layer underlain by a clay layer, as shown. If the degree of saturation of the sand above water table was 50%. Saturated and dry unit weight of sand are 21.2 kN/m^3 and 18.22 kN/m^3 respectively. The saturated unit weight of clay is 18 kN/m3. Determine the total stress, pore pressure and effective stress at point A,B,C.arrow_forward
- A normally consolidated clay layer, 3 m thick, has the following properties : Initial void ratio, e0= 0.8 Compression index, Cc = 0.25 Average effective pressure, σ’0 = 125 Kpa Expected pressure increase, Δσ’ = 45 Kpa Secondary compression index, Ca = 0.02 Time of completion of primary settlement = 1.5 years What is the total settlement of the clay layer five years after the completion of the primary settlement?arrow_forwardA layer of soft clay having an initial void ratio of 2.0 is 12.5 m thick. Under a compressive load applied above it, the void ratio decreased by one half. Evaluate the reduction in the thickness of the clay layer in m.arrow_forwardConsolidation of an undrained clay occurs at an effective pressure of 100 kPa and a shear stress of 40 kPa. The ratio of effective pressure to shear stress in drained clay is 2 to 1. If the shear stress at zero effective pressure, To, is 10 kPa, what is the pore water pressure at failure? A. 10 kPa в. 40 кра с. 53 кра D. 67 kPaarrow_forward
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