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 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.
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.
The 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?
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Principles of Foundation Engineering (MindTap Course List)
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- A 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_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_forwardH1arrow_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_forwardA 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_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 deposit of clay underlain a 4.5m thick sand. the degree of saturation of sand is 37%, the void ratio is 0.52. the moisture content of clay is 42 %. the natural groundwater table is located at 2m below the natural ground surface. assume that the sp.gr. of sand and clay are both 2.65. compute: unit weight of sand above the water table effective pressure at point 10m below the ground surface total pressure at point 10m below the ground surfacearrow_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_forwardThe initial void ratio of an inorganic clay is found to be 0.65, while the specific gravity of solids is 2.68. Determine the moisture content if the soil is 50% saturated. O a. 12.12 O b. 14.55 O c. 24.25 Od. 16.98arrow_forward
- PROBLEM 1: A layer of sand 4.5m thick with specific gravity of 2.60, degree of saturation of 85%, and porosity of 41.18% with a 5 m thick of clay with specific gravity of 2.65 and a water content of 0.28. Ground water table is located at the interface of the two soils. Compute the depth below the ground surfac would the effetive stress be 100kPa. B. Compute the effective stress at a depth 8m below the ground surface. C. Compute the depth of excavation required to reduce the effective stress by 60 kPaarrow_forwardQuestion A 588 cm³ volume of moist sand weighs 1010 gm. Its dry weight is 918 gm and specific gravity of solids, G is 2.67. Assuming density of water as 1 gm/cm³, the void ratio isarrow_forwardA sand with Gs = 2.66 and a void ratio of 0.60 is completely dry. It the becomes wetted by a rising groundwater table. Compute the unit weight in KN/m3 under the following conditions; a) When the sand is completely dry b) When the sand is 40% saturated c) When the sand is completely saturatedarrow_forward
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