Assuming that a river bed level does not change and the depth of water in river was 10 m, 15 m and 8 m during the months of February, July and December respectively of a particular year. The average bulk density of the soil is 20 kN/m³. The density of water is 10 kN/ m³. The effective stress at a depth of 10 m below the river bed during these months would be (a) 300 kN/m2 in February, 350 kN/m² in July and 320 kN/m² in December (b) 100 kN/m2 in February, 100 kN/m? in July and 100 kN/m² in December (c) 200 kN/m2 in February, 250 kN/m² in July

Assuming that a river bed level does not change and the depth of water in river was 10 m, 15 m and 8 m during the months of February, July and December respectively of a particular year. The average bulk density of the soil is 20 kN/m³. The density of water is 10 kN/ m³. The effective stress at a depth of 10 m below the river bed during these months would be (a) 300 kN/m2 in February, 350 kN/m² in July and 320 kN/m² in December (b) 100 kN/m2 in February, 100 kN/m? in July and 100 kN/m² in December (c) 200 kN/m2 in February, 250 kN/m² in July

Principles of Foundation Engineering (MindTap Course List)

8th Edition

ISBN:9781305081550

Author:Braja M. Das

Publisher:Braja M. Das

Chapter16: Soil Improvement And Ground Modification

Section: Chapter Questions

Problem 16.9P

See similar textbooks

Similar questions

A sediment settling lagoon has a depth of water of 4 m above the clay base. The clay layer is 3 m thick and this overlies 4 m of medium sand, which in turn overlies impermeable rock. Given the unit weight of clay, medium sand and sediment of silty fine sand is 18 kN/m², 20 kN/m³ and 16 kN/m², respectively. Calculate the effective stress at the top of the clay and at the top and bottom of the second layer under the following condition; i) initial, before any sediment is deposited. ii) After a 2m layer of sediment of silty fine sand has been deposited. iii) After draining the lagoon down to base level, with the same thickness (2m) of sediment still in place
A saturated clay layer has a thickness of 10 meters with a water content of 51% and a specific gravity 2.72. Determine the following: 1. Saturated unit weight of the clay * a. 21.46 kN/m³ b. 18.12 kN/m³ c. 16.87 kN/m³ d. 14.95 kN/m³ 2. total stress at depth of 10 meters a. 122.1 kPa b. 151.3 kPa c. 168.7 kPa d. 142.5 kPa 3. Effective stress at depth of 10 meters a. 42.1 kPa b. 70.6 kPa c. 68.7 kPa d. 82.5 kPa
A clay formation having a depth of 4 m. underlies a sand formation having a depth of 3 m. The dry unit weight of sand is 16.5 kN/m3 and the saturated unit weights of clay and sand are 20.4 kN/m3 and 19.6 kN/m3 respectively. The groundwater table is at the interface of the sand and clay. Compute the effective stress in kPa at the bottom of the clay if water rises 2 m. above the ground surface.
In a clayey sandy silt deposit, the water table is 3.5 m below the surface, but the sand to a height of 1.5 m above the water table is saturated by capillary water. The top 2 m of sand can be assumed to be dry. The saturated and dry unit weights of the soil are 19.5 kN/m^3 and 18.0 kN/m^3, respectively. Calculate the effective vertical stress at 8 m below the surface. Express answers in kPa rounded to the first decimal place.
A dense silt layer has the following properties:Void ratio = 0.30Effecive diameter = 10umCapillary constant = 0.20 cm2Free ground water level is 8 m below the ground surface.a. Find the height of the capillary rise in the silt.b. Find the vertical effective stress in kPa at a depth of 5 m. Assume soil unit weight of 26.5 kN/m3 and that of soil above the capillary action rise and round surface is partially saturated at 50 %.c. Find the vertical effective stress in kPa at a depth of 10 m. Assume soil unit weight of 26.5 kN/m3 and that of soil above the capillary action rise and round surface is partially saturated at 50 %.......
Given that: • Hydraulic gradient = 0.43 • unit weight of the saturated soil layer = 19.80Kn/m³ • rate and direction of seepage = 4.29 x 10^-4 m³/s (upward) • moisture content of the fully saturated soil layer = 24.25% Answer the ff: a) What would be the critical value of h to cause boiling b) If the value of h= 1.5 m boiling will? and If the value of h= 4.0 m boiling will? c) The total stress at point B d) The effective stress at point B e) The neutral stress at point B
A uniform soil deposit has a dry unit weight of 15.6 kN/m³ and a saturated unit weight of 17.2 kN/m³. The groundwater table is at a distance of 4 m below the ground surface. Point A is at a depth of 6 m below the ground surface. If the water table rises by 3.5 m, determine the change in effective stress at A. Indicate if it is maintained, increased or decreased.
a dense silt layer has the following properties: void ratio = 0.50, effective diameter d10 = 10 um, capillary constant c = 0.20 cm2. free ground water level is 8.0 m below the ground surface. find the vertical effective stress in kpa at 5m depth. assume unit weight of solids = 26.5 kn/m3 and that the soil = 26.5 kn/m3 and that the soil above the capillary action rise and ground surfaces is partially saturated at 50% from the problem above, find the vertical effective stress at 10m depth. assume unit weight of solids=26.5kN/m3 and that the solid above the capillary action rise and ground surface is partially saturated at 50%.
Determine total stress at end of silt layer
A river is 2 m deep. The riverbed consists of a depth of sand of saturated unit weight of 20 kN/m3. What is the effective vertical stress 5 m below the top of the sand? If the water level is raised by 1 m, what would be the new effectivevertical stress?
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 density of 15 kN/m3 and an average water content of 36%. The water table is almost at the surface. Tests on undisturbed samples of the silt indicate the following values: Cu = 45 kN/m2; φu = 18°; C′ = 35 kN/m2; φ′ = 27° Estimate the shearing resistance of the silt on a horizontal plane, when the shear stress builds up very slowly. (in kN/m2)
The Pacific Ocean is 200m deep. The seabed consists of a depth of sand, with saturated unit weight of 20 kN/m3What is the effective stress 6 m below the top of the sand? What is the pore water pressure at this depth?