EII-wxXxSandClayGL#GWTHard stratumAssuming unit weight of water as 10kN/m3, the ultimate consolidationsettlement (expressed in mm) of the claylayer is An undisturbed soil sample was takenfrom the middle of a clay layer (i.e., 1.5m below GL), as shown in figure. Thewater table was at the top of clay layer.Laboratory test results are as follows:Natural water content of clay : 25%Pre-consolidation pressure of clay : 60kPaCompression index of clay : 0.50Recompression index of clay : 0.05Specific gravity of clay : 2.70Bulk unit weight of sand : 17 kN/m3A compacted fill of 2.5 m height withunit weight of 20 kN/m³ is placed at theground level.

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Principles of Foundation Engineering (MindTap Course List)

9th Edition

ISBN:9781337705028

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter2: Geotechnical Properties Of Soil

Section: Chapter Questions

Problem 2.13P

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A given saturated clay is known to have effective strength parameters of c' = 10 kPa and = 28°. A sample of this clay was brought to failure quickly so that no dissipation of the pore water pressures %3D could occur. At failure it was known that o KPa, o = 10 KPa and = 20 kPa. %3D (a) Estimate the values of o, and oz at failure (b) Use the Mohr circle to illustrate the effective stress and total failure stress.
Subject: Soil Mechanics Please provide a solution and a diagram For a laboratory consolidation test on a clay specimen (drained on both sides) the following results were obtained: Thickness of clay soil= 25 mm; P_1 = 50 kPa; P_2 = 120 kPa; e_1 = 0.92; e_2 = 0.78; Time for 50% consolidation= 2.5 min. Tv = 0.197. Determine the hydraulic conductivity of the clay for the loading range in m/min. a. 1.081 x 10^-3 b. 2.56 x 10^-2 c. 1.31 x 10^-7 d. 1.23 x10 ^-5
Volume of a soil sample obtained was 150 cm^3 and its total mass was found to be 250 g. In the laboratory the dry mass of the sand alone was found to be 240 g. Tests on the dry sand indicated e-max = 0.80 and e-min = 0.48. Estimate ps, w, e, S, pd and Dr of the sand in the field. Given Gs = 2.67. %D
The height of the sample sand to be tested = 20 cm and the height of the saturated sand = 16 cm. Find the bulking of sand. 1. 20% 2. 55.5% 3. 25% 4. 80%
Find the C, and the "apparent" OCR for a superficial clay stratum that is 4m thick. The water is at the surface. A sample of the clay has a water content of 27.9%, and a specific gravity of 2.65. An oedometer test showed the following results: Voids Ratio 0.736 0.733 0.73 0.675 0.638 0.6 Vertical Effective Stress 15 28 60 230 480 930
A consolidated-undrained tri-axial test was conducted on a normally conslidated clay sample and the results are follows: Chamber confining pressure= 119kpa Deviator Stress at failure=90 kpa Pore water pressure= 58kpa These results were used to determine the drained friction angle of the soil. Compute the deviator stress (kpa) at failure when the drained test was conducted with the chamber confining pressure changed to 156 kpa. Use stored value. Answer to 5 decimal places.
Problem Set 2: 4. A sample of gray silty clay has a mass of 126 kg. Laboratory tests results give a moist density (p) of 2.05 g/cm³, a specific gravity of solids (G,) of 2.71, and a moisture content (w) of 15.7%. First determine all entries in the phase diagram. Then determine the void ratio (e), the porosity (n), the degree of saturation (S), the dry density (Pa), the dry unit weight (ya), and the moist unit weight (y). Draw the Phase diagram.
The following results were obtained from an oedometer test on a specimen of saturated clay: 54 107 214 429 214 107 54 27 Pressure (kPa): 1.024 1.012 1.001 0.994 1.068 1.144 1.217 1.243 Void ratio: A layer of this clay 8 m thick lies below a 4 m depth of sand, the water table being at the surface. The saturated unit weight for both soils =19 kN/m3=19 kN/m3. A 4 m depth of fill, unit weight =21 kN/m3=21 kN/m3, is placed on the sand over an extensive area. Determine the final settlement due to consolidation of the clay. If the fill were to be removed some time after the completion of consolidation, what heave would eventually take place due to swelling of the clay?
4. The construction of a 10m x 10m square water tank in a residential neighbourhood has been planned. As indicated in Figure below, a 6m thick soft clay layer was discovered between sand layers during site exploration. For laboratory studies, an undisturbed soil sample was obtained in the middle of the soft clay layer. The findings of the laboratory consolidation test are listed below. Pressure, o' (kN/m2) | 25 50 100 200 400 800 Void Ratio, e 1.28 1.26 1.22 1.14 1.05 0.95 i. Find the preconsolidation pressure (o'c), Virgin, and Laboratory Compression Index using the information above (Cc). Find the primary consolidation settlements that will occur at the water tank's centre due to compression of the soft clay layer ii. 10 m Load = 18,000 kN Ground Level 1 m Ground water level Dense Sand, y= 20 kN/m³ 2 m Soft Clay Kat = 16 kN/m³ ; eo= 1.38 Cc = graph? ; Cs =Cc; o' = graph? 6 m %3D %3! Very Dense Sand
d) A sample of silty clay has a mass of 126 g. Laboratory tests results give a bulk density (p») of 2.05 g/em', a specific gravity of solids (G.) of 2.71, and a moisture content (w) of 15.7%. Determine all the phase distributions and use the values to calculate the following: i) void ratio (e), ii) porosity (n), ii) degree of saturation (S), iv) dry density (pa), v) dry unit weight (ya), and vi) bulk unit weight (yhwlk)
An undisturbed sample of clay, 24 mm in thickness, is tested in a consolidometer. The total change in the thickness of the specimen in 4.74 mm when the applied pressure is 200 kN/m² and 6.13 mm when the applied pressure is 400 kN/m. On reducing the pressure to zero, the specimen swells to a thịckness of 18.50 mm. The final water content of the specimen is 32.6% and specific gravity is 2.72. The clay stratum, 1 m thick, is sandwiched between pervious strata, and is subjected to an overburden pressure of 200 kN/m². Estimate the probable settlement of a proposed structure, if due to its construction, the effective pressure at the centre of the clay layer is expected to be increased to 400 kN/m². don't try to solve this question, otherwise
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the ultimate consolidation ent (expressed in mm) of the clay