Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN: 9781305635180
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 9, Problem 9.7P
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Q 8.7
If the coefficient of consolidation for the clay layer in problem 8.3 is 0.0018 cm^2/Sec, how long will it take for 60% primary consolidation to take place? What will be the total compression due to consolidation at that time?
A buried clay layer 10 ft thick is sandwiched between strata of free-draining granular soil so that double drainage during consolidation can occur. Calculations indicate that, because of a planned building loading, an ultimate settlement of 2 in. is expected as a result of primary compression in the clay layer. The coefficient of consolidation for the clay is 0.01 ft2/day.
(a) How long will it take for 90 percent of the estimated settlement to take place?(b) How much settlement will occur in one year?(c) How long will it take for 1 in. of settlement to take place?
The following data are given for overconsolidated clay:
Gs=2.71
LL=45
Average Pressure=120 kPa
e=0.8
thickness=4m
Change in Pressure =40 kPa
Cs=1/5 Cc
Determine the following
1. Compression Index (Ans. 0.315)
2. Pre-consolidation Pressure (Ans. 92.9 kPa)
3. Primary Consolidation Settlement (Ans. 49 mm)
Chapter 9 Solutions
Fundamentals of Geotechnical 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
- a. Calculate the degree of consolidation of a 6 m thick double drained clay layer after 4862 days since initial loading. The coefficient of consolidation is 1.06 X 10-6 m2/min. b. For the same clay layer, how much time would it take to reach 30% consolidation, if drainage existed on only one boundary?arrow_forwardQuestion-3: A soil profile is shown in Figure 3.1. If a uniformly distributed load, ∆σ, is applied at the ground surface, calculate the settlement of the clay layer caused by primary consolidation, if Cc = 0.27 and Cr = 0.045 and a. The clay is normally consolidated b. The preconsolidation pressure, σ′c = 190 kN/m2 c. σ′c = 170 kN/m2arrow_forwardKnowing that the compression index, Cc = 0.333, and the preconsolidation pressure s’c = 140 kPa with an initial void ratio e0 = 0.85 for a H = 3 m thick clay layer which is subjected to a new loading for an embankment resulting in a stress increase to 200 kPa; what is the expected consolidation settlement? Provide answer below in meters (m).arrow_forward
- Given: rw = 0.25 m, rs = 0.35 m, de =4.5 m, cv 5 cvr = 0.3 m2/month, kh/ks 5 2, and Hc = 9 m. Determine: The degree of consolidation for the clay layer causedonly by the sand drains after six months of surchargeapplicationarrow_forwardA buried clay layer ten feet thick is sandwiched between strata free draining granular soil so that double drainage during consolidation can occur calculations indicate that due to a planned building loading, an ultimate settlement of 2 inches is expected as a result of compression in the clay layer. The coefficient of consolidation for the clay layer is 0.01 ft.2/day.a) How long will it take for 90 % of the estimated settlement to take place ? b) How much settlement, H, will occur in one year %?c) How long will it take for an inch of settlement to take place ?arrow_forwardHow many days would be required by a clay stratum 10 m thick, draining at both ends with an average value of coefficient of consolidation = 50 x 10-4 cm 2/ sec, to attain 50 % of its ultimate settlement?arrow_forward
- Under a given surcharge, a 5.1 m thick layer has consolidation settlement of 306 mm. Assume Cv=0.003 sqcm/sec. a. What is the average degree of consolidation for the clay layer when the settlement is 85mm? b. How long will it take for 60% consolidation to occur if the layer is drained at the top only? c. How long will it take for 60% consolidation to occur if the layer is drained on both ends? Please answer this asap. For upvote. Thank you very mucharrow_forwardA 10 m clay layer is sandwiched between two sand layers and subjected to a uniformly distributed load of 100 kPa. If the coefficient of consolidation is 0.005 cm2 /s. length of the drainage path is 5m. What will be the time required for 50% consolidation?arrow_forwardA clay layer, whose total settlement under a given loading is expectedto be 13cm settles 3 cmat end of 1 months after application of load increment. How many months will be required to reach a settlement of 8cm? How much settlement will occur in 12months? Assume the layer to have double drainagesarrow_forward
- A deposit of cohesionless soil with a permeability of 0.3 mm/s has a depth of 12 m with impervious ledge below. A sheet pile wall is driven into this deposit to a depth of 8 m. The wall extendsabove the surface of the soil, and a 3 m depth of water acts on one side. Sketch the flow net and determine the seepage quantity. a. 600 ml/s/meter length b. 300 ml/s/meter length c. 1200 ml/s/meter length d. 900 ml/s/meter lengtharrow_forwardA long embankment 30 m wide is to be built on ground. The net vertical pressure applied by the embankment (assumed to be uniformly distributed) is 90kpa. The soil profile and stress distribution beneath the center of the embankment is also shown. The value of mv for the upper clay is 0.35m2/MN, and for the lower clay mv=0.13m2/MN. Tthe permeabilities of the cllays are 10-10m/s and 10-11m/s for the upper and lower soil respectively. Determine the final settlement under the center of the embankment due to consolidationarrow_forwardA 3-m-thick layer (two-way drainage) of saturated clay under a surchargeloading underwent 90% primary consolidation in 75 days. Find the coefficientof consolidation of clay for the pressure range.arrow_forward
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