5.0 ft5.0 ftGround surfaceSand10.0 ftSoft clay10.0 ftSand10.0 ftRock layerFigure 1: Soil stratum with sand layer under artesian pressure. A deposit of clay lies between two layers of sand as shown in Figure 1. The lower sandlayer is under artesian pressure. The moist unit weight of the sand above the groundwatertable is 105 lb/ft³; below the groundwater table its saturated unit weight is 120 lb/ft³. Thesaturated unit weight of the clay layer is 110 lb/ft³.Determine the following:a) The vertical total stress, the pore pressure and vertical effective stress at the bottom ofthe clay layer.b) The height d above the ground surface of the water in the piezometer that would cause“boiling” (heave) of the upper sand layer.

Answered: Image /qna-images/answer/d0c6668e-2504-4354-8662-f08674f282ec.jpg

Answered: 5.0 ft 5.0 ft Ground surface Sand 10.0…

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter8: Stresses In A Soil Mass

Section: Chapter Questions

Problem 8.11P

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The diagram below shows a multi-layered soil, write an expression for the stress at each layer and the vertical total stress at depth z. (all symbols have their usual meaning)
si
Calculate and then plot the change in total stress, effective stress and pore water pressure with the plate for the soil layers shown in the figure below and according to the conditions: • There is no effect of capillary action • There is an effect of capillary action at a distance of 2m above the water level in the sandy layer
Question 20 A soil profile consists of sand (5-m thick) which overlies a layer of clay (9-m thick). Ground water table is located at the interface of the sand and clay. The effective stress at the bottom of the clay layer was determined. If the water table rises to the top of the ground surface, what is the change in the effective stress (in kPa) at the bottom of the clay layer? For sand layer: Void Ratio = 0.82, Specific gravity = 2.68, Degree of Saturation = 0.6 For clay layer: Void Ratio = 0.92, Specific gravity = 2.86 Round off to two decimal places.
topic: geotechnical engineering The ground water level in a thick, very fine sand deposit is located at 2.0 m below the ground surface. Above the free ground water, the sand is saturated by capillary action. The unit weight of the saturated sand is 20.3kN/m^3 a. total stress located at 4.5 m below the ground surface b. Pore water pressure at 4.5 m below the ground surface c. Effective stress 4.5 m below ground surface
The ground conditions at a site are shown in the figure below GL Sand Water table is at ground level = 20% 5 m %3D Water content Specific gravity of solids = 2.7 Unit weight of water = 10kN/m a) The saturated unit weight of the sand (kN/m³) is (a) 15 (b) 18 (c) 21 (d) 24 B) The total stress, pore water pressure and effective stress (kN/m2) at the point P (a) 75, 50 and 25 (b) 90, 50 and 40 (c) 105, 50 and 55 (d) 120, 50 and 70 a0081
A soil profile is shown in figure below. Calculate the following:a. Effective stress at point A in kPa.b. Effective stress at point B in kPa.c. Effective stress at point C in kPa.
Question 33 Dry Sand H, Groundwater Table Clay H, Refer to the soil profile shown. Given H1 = 9.89 m., and H2 = 5.8 m. If the ground water table rises by 3.78 meters, determine the change in effective stress (numerical value only, in kPa) at the bottom of the clay layer. Properties of dry sand: Gs = 2.53, e = 0.63. Properties of clay: Gs = 2.75, e = 0.81. Round off to two decimal places.
Refer to Figure 10.48. If R = 4 m and hw = height of water = 5 m, determine the vertical stress increases 2 m below the loaded area at radial distances where r = 0, 2, 4, 6, and 8 m. Circular contact area of radius R on the ground surface Figure 10.48
The soil profile shown consists of dry sand (7-m thick) which overlies a layer of clay (6-m thick). Ground water table is located at the interface of the sand and clay. The effective stress at the bottom of the clay layer was determined. If the water taable rises to the top of the ground surface, what is the change in effective stress (kpa) at the bottom of the clay layer? For sand layer: Void Ratio= 0.89 SG= 2.67 Degree of Saturation= 0.62 For claylayer: Void Ratio= 0.92 SG=2.72
Problem 2 Plot the stress profile for total stress, effective stress, and pore water pressure. Show all calculation. Diy sand 0.61 Saturated sand 0.48. G-267 Clay
Dry Sand H Groundwater Table Clay H, Refer to the soil profile shown. Given H1 = 9.46 m., and H2 = 4.79 m. If the ground water table rises by 2.58 meters, determine the change in effective stress (numerical value only, in kPa) at the bottom of the clay layer. Properties of dry sand: Gs = 2.57, e = 0.63. Properties of clay: Gs = 2.74, e = 0.88. Round off to two decimal places.

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