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 15, Problem 15.4P
To determine
Find the free swell at the ground level.
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The representative liquid limit and plastic limit values of a saturated consolidate clay deposit are 60%
and 30%, respectively. The saturated unit weight of the soil is 19 kN/m³. The water table is at 8m
below ground level. At a depth of 10m from the ground surface, what is the undrained shear strength
of the soil.
Under normal loading condition, a 3.6-m thick clay (normally consolidated) has po = 190 kPa and eo = 1.22. A surcharge of 190 kPa reduces its void ratio to 0.91. The hydraulic conductivity of the clay for the loading range is 6.1 x 10-5 m/day.
a. What is the coefficient of volume compressibility of the clay?
b. What is the coefficient of consolidation of the clay?
c. How long will it take for this clay layer to reach 60% consolidation if it is drained on one side only?
Please answer this asap. For upvote. Thank you very much
The water content and the total density in a
partially saturated sand ( G= 2.64) layer are
w=20% and p=1.8 g/cm3 , respectively. If the
maximum and minimum values of the void
ratio are 0.92 and 0.62, respectively
determine the relative density Dr of the
sand in this layer.
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Principles of Foundation Engineering (MindTap Course List)
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- A 5 m thick clay layer lies between two layers of sand each 4 m thick, the top of the upper layer of sand being at ground level. The water table is 2 m below the ground level but the lower layer of sand is under artesian pressure, the piezometric surface being 4m above ground level. The 27 saturated unit weight of clay is 20 kN/m³ and that of sand is 19 kN/m³. Above the water table unit weight of sand is 16.5 kN/m³. Calculate the effective vertical stresses at the top and bottom of the clay layer. Also draw the total vertical stress diagram in the given soil layers.arrow_forwardA sand has Gs = 2.66. Calculate the hydraulic gradient that will cause boiling for e = 0.35, 0.45, 0.55, 0.7, and 0.8.arrow_forward1. Under normal loading condition, a 3.6 m thick clay (normally consolidated) has P, = 190 KPa and e, =1.22. A surcharge of 190 KPa reduces its void ratio to 0.98. The hydraulic conductivity of the clay for the loading range is 6.1 x 10ʻ m/day. a. What is the coefficient of volume compressibility of the clay? b. What is the coefficient of consolidation of the clay? c. How long will it take for this clay layer to reach 60% consolidation if it is drained on one side only?arrow_forward
- -14. A fine sand has an in-place unit weight of 18.85 kN/m³ and a water content of 5.2%. The specific gravity of sol ids is 2.66. Void ratios at densest and loosest conditions are 0.38 and 0.92, respectively. Find the relative density.arrow_forwardThe profile at a site consists of 5m of sand overlying 10m of compressible clay, which in turn overlies a dense sand. The water table is at the top of the profile. The total unit weight of the top sand is 19kN/m3 and that of the clay is 18kN/m3. The Cv of the clay is estimated to be 5x 10-3 cm2/sec. Initially the clay is normally consolidated. It is planned to place a temporary fill that will exert a vertical load of 200kPa over the entire site. How long must the fill be in place so that, after it is removed, the maximum past pressure at every point in the clay is at least 50kPa larger than the vertical effective stress that existed before the fill was placed?arrow_forwardA 600 cm volume of moist sand weighs 1050 g Its dry weight is 930 g and specific gravity of solids, G is 2 67. Assuming density of water as 1 g/cm, the void ratio is Select one O a 0 50 Ob.0.64 OC.0.48 Od 0.72arrow_forward
- A ground profile consists of 2.0 meters silty sand underlain by 3.0 meters of clay. The ground water table is 3.0 meters below the ground surface. The sand has a unit weight of 14 kN/cu.meter. The clay has a unit weight of 16 kN/cu.meter above the water table and 20 kN/cu.meter below the water table. Determine the total soil stress at the bottom of the clay layer.arrow_forwardAt 0.45 porosity the hydraulic conductivity of the sand is 0.010 cm/sec. What is the hydraulic conductivity at n = 0.50. a) 0.090 cm/sec b) 0.017 cm/sec c) 0.10 cm/sec d) 0.055 cm/sec make it fastarrow_forwardA layer of sand extends from group level at 9m and overlies a layer of clay of very Low permeability 6m. The water table is 6m below the surface of the sand the saturated unit weight of the sand is 19kn/m3.and that of the clay 20kn/m3.the unit weight of the sand above the ? table is 17kn/m3 .over a short period of time the water table lower by 3m. And expected to remain permanently at that Level. Determine the effective vertical stress at depth of 8 and 12m. Below the ground level.(a) immediately after the lowering of water table (b) several years after the lowering of the water table. Explain your answer for each step.arrow_forward
- A fine, dry sand with an in-place unit weight of 17. 28 KN/m^3 has a spocific gravity of solids of 2.62. The void ratio at its densest condition is 0.368 and the void ratio at the loosest condition is 0.938. Determine the relative density of the soil.arrow_forward50 ft thick sand is underlain by 25 ft clay. The ground water table, initially at the ground surface, was lowered to a depth of 25 ft below the ground. After such lowering, the degree of saturation of the sand above water table was lowered to 20%. Saturated and dry unit weight of sand are 135 pcf and 116 pcf respectively. The saturated unit weight of clay is 120 pcf. a. what is the unit weight of the sand above the water table after lowering in pcf? b. What is the vertical effective pressure at the midheight of the clay layer when the water table is lowered 50 ft. Below the ground in psf?arrow_forwardA 10 meter soil profile consists sand overlying 3.50 m thick clay layer with porosity of 48.718% and specific gravity of 2.72. Water table is located 6.50 meters below ground surface. A 2.50 meters thick capillary rise layer is considered having a void ratio of 75.0%, degree of saturation of 60% and specific gravity of 2.71. The dry sand layer has a porosity of 33.333% and a specific gravity of 2.66. What is the total effective stress at 4 meters below. ground surface? [arrow_forward
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