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 2.15P
(a)
To determine
Find the consolidation settlement in first two years.
(b)
To determine
Find the compression index of the clay, if it is normally consolidated.
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A three-layer soil has the following properties:
Layer 1: k = 2.57 x 10^-3 cm/s, H = 3.6 m.
Layer 2: k = 1.7 x 10^-2 cm/s, H = 4.63 m.
Layer 3: k = 3.19 x 10^-3 cm/s, H = 4.81 m.
Determine the equivalent vertical coefficient of permeability of the soil arrangement. Layer 1 is on top of layer 2 while layer 2 is on top of layer 3.
A three-layer soil has the following properties:
Layer 1: k = 2.77 x 10^-3 cm/s, H = 3.17 m.
Layer 2: k = 1.6 x 10^-2 cm/s, H = 4.97 m.
Layer 3: k = 3.06 x 10^-3 cm/s, H = 4.25 m.
Determine the equivalent vertical coefficient of permeability of the soil arrangement. Layer 1 is on top of layer 2 while layer 2 is on top of layer 3. Round off to four decimal places.
Q A layer of sand extends from ground level to a depth of 9 m and overlies a layer of clay, of very low permeability, 6 m thick. The water table is 6 m below the surface of the sand. The saturated unit weight of the sand is 19 kN/m3 and that of the clay 20 kN/ m3; the unit weight of the sand above the water table is 17 kN/m3. Over a short period of time the water table lowers by 3 m and is expected to remain permanently at this new level. Determine the effective vertical stress at depths of 8 and 12 m below ground level (a)immediately after the lowering of water table and (b)Several years after the lowering of the water table. Explain your answer for each part.
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