Foundation Design: Principles and Practices (3rd Edition)
3rd Edition
ISBN: 9780133411898
Author: Donald P. Coduto, William A. Kitch, Man-chu Ronald Yeung
Publisher: PEARSON
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Textbook Question
Chapter 3, Problem 3.18QPP
A 9 ft thick fill is to be placed on the soil shown in Figure 3.22. Once it is compacted, this fill will have a unit weight of
Figure 3.22 Soil profile for Problem 3.18.
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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?
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%)
Question-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/m2
Chapter 3 Solutions
Foundation Design: Principles and Practices (3rd Edition)
Ch. 3 - Explain the difference between moisture content...Ch. 3 - A certain saturated sand has a moisture content...Ch. 3 - Consider a soil that is being placed as a fill and...Ch. 3 - A sample of soil has a volume of and a weight of...Ch. 3 - A site is underlain by a soil that has a unit...Ch. 3 - The sub-surface profile at a certain site is shown...Ch. 3 - A vertical load of 300 kN is applied to a area at...Ch. 3 - A vertical load of 20 k is applied to a area at...Ch. 3 - 3m3m footing is to be built on the surface of a 15...Ch. 3 - A 3 ft square footing carries a sustained load of...
Ch. 3 - A 2m thick fill is to be placed on the soil shown...Ch. 3 - Estimate the effective friction angle of the...Ch. 3 - Explain the difference between the drained...Ch. 3 - A soil has c=5 kPa and =32. The effective stress...Ch. 3 - A footing with an embedment of 2 m is embedded in...Ch. 3 - Prob. 3.16QPPCh. 3 - Prob. 3.17QPPCh. 3 - A 9 ft thick fill is to be placed on the soil...
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- For leossial soil, given Gs = 2.74. Plot a graph of γd (kN/m3) versus liquid limit to identify the zone in which the soil is likely to collapse on saturation. If a soil has a liquid limit of 27, Gs = 2.74, and γd = 14.5 kN/m3, is collapse likely to occur?arrow_forwardThe following technical data are given below: Overburden pressure = 180KPa Increase in pressure = 140KPa Clay thickness = 8m Compression Index = 0.315 Void ratio = 1.132 What is the total settlement in clay?arrow_forwardA 10 ft thick clay layer (with top and bottom drainage) is projected to have 10 inches of consolidation settlement. There has currently been 3 inches of settlement over a 35 day period. What is the vertical coefficient ofconsolidation value for this clay layer? What is the estimated time to reach 98% consolidation?arrow_forward
- The hydraulic gradient for an occurrence where there is a vertically upward flow of water through a sand mass is 0.95. If the specific gravity of the soil particles is 2.75 and the void ratio is 0.65, determine if a quicksand or erosion condition could develop.arrow_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_forwardA soil profile is given in Figure 7.18a. The consolidation test in the laboratory was carried out to test a soil sample taken from the center of the soil layer. Interpolated field consolidation curves from experimental results in the laboratory given in Figure 7.18b. Calculate the amount of settlement that occurs as a result of primary consolidation if an embankment (surcharge) of 50 kN/m² is placed on the ground surface.arrow_forward
- A 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_forward1.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_forwardWhy might the permeability in fine-grained soil deposits be expected to be greater for horizontal flow than for vertical flow?arrow_forward
- A 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 recently filled up fill was 10.54 m thick and its average void ration was 1.0. The fill was loaded on the surface by constructing an embankment covering a large area of the fill. Some months after the embankment was constructed, measurements of the fill indicated an average void of 0.8. Calculate the compression of the fill.arrow_forwardWhat do mean by liquefaction and cyclic mobility Explain in details? What types of soils are susceptible to liquefaction? What are effects of earthquake related liquefaction of geotechnical structures. Show the cyclic mobility in dense sand at larger confining pressure of 200 kPa with diagrams.arrow_forward
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