Principles of Foundation Engineering (MindTap Course List)
9th Edition
ISBN: 9781337705028
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 2, Problem 2.14P
To determine
Find the time taken for the same clay to consolidate 75 %, when it has one way drainage compared to two way drainage.
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Principles of Foundation Engineering (MindTap Course List)
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, civil-engineering and related others by exploring similar questions and additional content below.Similar questions
- 1.In an oedometer test a specimen of saturated clay 19 mm thick reaches 50%consolidation in 20 min. How long would it take a layer of this clay 5 m thick toreach the same degree of consolidation under the same stress and drainageconditions? How long would it take the layer to reach 30% consolidation?arrow_forwardWhat is the typical saturated permeability values for sand, silt and clay?arrow_forwardA normally consolidated clay layer has the following properties: Soil layer thickness: 3.7 m Initial void ratio: 0.63Compression index: 0.29 Average effective pressure: 133 kPa Expected pressure increase: 58.7 kPa Secondary compression index: 0.02 Time for completion of primary settlement: 3 yearsa. Determine the void ratio at the start of the secondary consolidation. b. What is the total settlement of the clay layer 9 years after the start of primary consolidation settlement?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?arrow_forwardA 3-m layer (double drainage) of saturated clay under a surcharge loading underwent 90% primary consolidation in 75 days. Find the coefficient of consolidation of clay for the pressure range..arrow_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_forward
- In the soil profile shown below, if the water table changes from level WT0 to level WT1 permanently, what is the change in the ground surface elevation in mm in the long term after primary consolidation is completed? Assume that the clay layer is initially normally consolidated. Use a single clay layer in your calculations and positive value for settlement. (Acceptable tolerance = 4%)arrow_forwardIn an oedometer test, with half-closed drainage condition, a specimen of saturated clay 19 mm thick reaches 50%consolidation in 20 min. How long would it take a layer of this clay 5 m thick to reach the same degree of consolidation under the same stress and drainage conditions? How long would it take the layer to reach 30% consolidation?arrow_forwardIf a representative clay specimen 20 mm thick, under double drainage, took 121 minutes for 90% primary compression, estimate the time in days required for 50% primary compression of a field layer 2 m thick, bounded by impervious boundary at the bottom and sand at the top. a.679 b.781 c.650 d.725arrow_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 clay layer consolidates after 6 years when its thickness is 5.70 m and the void ratio is 1.08. Assuming the secondary compression index in 0.04, estimate the secondary compression settlement in the next 15 years. Express your answer in mm rounded to the nearest whole number.arrow_forwardHow long will it take (in days) for a 3-foot clay layer in the field (double drained) to reach 60% consolidation? The coefficient of consolidation for the clay is 2.5 X 10-6 m2/min.arrow_forward
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