4. The porosity of a sample of sand in the loose state was 54% and in dense state, 38%. The specific gravity of the soil grain was 2.60. Determine the saturated and submerged unit weights, and critical hydraulic gradient in both the states) (17.28 kN/m, 19.69 kN/m, 7.45 kN/m'; 9.88 kN/m'; 0.76; 1.01)

4. The porosity of a sample of sand in the loose state was 54% and in dense state, 38%. The specific gravity of the soil grain was 2.60. Determine the saturated and submerged unit weights, and critical hydraulic gradient in both the states) (17.28 kN/m, 19.69 kN/m, 7.45 kN/m'; 9.88 kN/m'; 0.76; 1.01)

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter9: Consolidation

Section: Chapter Questions

Problem 9.17P

See similar textbooks

Similar questions

What is the intensity of active earth pressure at a depth of 10.0 m in dry sand with an angle of shearing resistance of 30 degrees and unit weight of 18kN /m ^ 3 ?
A thin layer of silt exists at a depth of 18 m below the surface of the ground. The soil above this level has an average dry unit weight of 15.1 kN/m3 and an average water content of 36%. The water table is almost at the ground surface level. Tests on undisturbed samples of the silt indicate the following values: cu = 45 kN/m2, ϕu = 18°, c' = 36 kN/m2 and ϕ' = 27°. Estimate the shearing resistance of the silt on a horizontal plane when (a) the shear stress builds up rapidly, and (b) the shear stress builds up slowly.
Estimate the lateral earth pressure developed at a depth 5 m below the soil surface of a loose sand deposit (wet unit weight of soil is 17.5 kN/m3). Also estimate the lateral pressure for the same depth if the sand is in a dense condition (unit weight is 20.5 kN/m3). What would be the total lateral pressure for the loose sand condition described if the water table were at the ground surface?
The soil profile at a site consists of a 3-m thick sand layer (moist unit weight = 16.5 kN/m^3, saturated unit weight = 18.5 kN/m^3) underlain by a 6-m thick clay layer (w = 27%, Gs = 2.70, mv = 0.31 MPa^-1, Cv = 2.6 m^3/year), which is underlain by a gravel layer as shown in the figure. A 3 m compacted fill with a unit weight of 20 kN/m^3 is required to be placed at ground level.a) What would be the final consolidation settlement, in mm rounded to the first decimal place?b) How long will it take for 50 mm consolidation settlement, in months rounded to the first decimal place?c) What would be the consolidation settlement in one year, in mm rounded to nearest whole number?
Estimate the lateral earth pressure at a depth 20 ft (6.1 m) below the ground surface in a loose sand deposit. The wet unit weight of the sand is 115 pcf (19 kN/m3). What would the total lateral pressure be if the water table rose to the ground surface (in psf or kPa)?
A 2m clay layer has values of e = 0.92 , Gs = 2.72 and liquid limit of 40%. Above the clay is a 3m thick layer sand with e = 0.50 and Gs = 2.62. The water table is located 1.6 m below the ground surface having a unit weight of 17.3 kN/cu. Meter, determine the following: a. Compression index of clayb. Effective pressure at the midpoint of clayc. Primary settlement for normally consolidated clay.......
A soil profile is shown in Figure Q3(b)(i). The groundwater level is located on the ground surface. The sand layer is under artesian pressure where the excess pore water pressure is 40 kN/m^2. (i) Calculate the total vertical stress, pore water pressure and effective vertical stress at the base of each layer. (ii)Determine the increment of the effective stress at the base of sand layer if the 1.5m height fill will be imposed on the ground surface. Note that, the density of the fill material is 1750 kg/m^3. (iii) The excavation will be made in the clay layer for the basement construction. Evaluate the stability of the soil from boiling or quick condition. The depth of the excavation is shown in Figure Q3(b)(ii). (iv)Propose the maximum depth of cut that can be made to avoid boiling or quick condition.
A dense silt layer has the following properties.void ratio = 0.30eff. Diameter ?10 = 10??capillary constant (c)=0.20 cm²Groundwater level is 8.0m below the ground surface 1. Calculate the height of capillary rise in the silt. 2. Calculate the vertical effective stress in kpa at 5m depth, assume ?? = 26.5 ??/?³and that the soil above the capillary action rise and ground surface is partially saturated at 50%. 3. Calculate the effective vertical stress at 10m depth assuming ?? = 26.5 ??/?³and that the soil above the capillary action rise and ground surface is partially saturated at 50%.
For a normally consolidated clay layer in the field, the following values are given:Thickness of clay layer = 8.5 ftVoid ratio ?? = 0.8Compression index ?? = 0.28Average effective pressure on the clay layer ??′ = 2650 lb ft2 ⁄∆?′ = 970 lb ft2 ⁄Secondary compression index ?? = 0.02What is the total consolidation settlement of the clay layer five years after the completionof primary consolidation settlement? (Note: Time for completion of primary settlement= 1.5 years.)
The subsoil strata at a site consist of fine sand 3.0 m thick overlying a stratum of clay 2.8 m thick. Under the clay stratum lies a deposit of coarse sand extending to a considerable depth. The water table is 2.8 m below the ground surface. Assuming the top fine sand to be saturated by capillary water, calculate the effective pressures at ground surface and at depths of 3.0 m, 5.8 m and 8.0 m below the ground surface. Assume for fine sand G = 2.65, e = 0.83 and for coarse sand G = 2.79, e = 0.53. What will be the change in effective pressure at depth 3.74 m, if no capillary water is assumed to be present in the fine sand and its bulk unit weight is assumed to be 16.88 kN/m3 . The unit weight of clay may be assumed as 19.75 kN/m3. Comment on the effect of the present of groundwater on design of earth structures?
A 3 m thick soil has coefficient of permeability 3 x10^-7 m/s. A separate test porosity 40% and bulk unit weight 21 kN/m^3 at a moisture content of 31%. Determine the head at which upward seepage will cause quick condition? a. 1.034 m b. 2.724 m c. 3.1 m d. 6.12 m
In a drained triaxial compression test, a saturated specimen of cohesionless sand fails at a deviator stress of 450 kN/m2 when the cell pressure was 135 kN/m2. Find the angle of inclination of the failure plane with the horizontal. Show diagram