A 6m thick homogeneous soil layer has a dry unit weight of 16.1kN/m^3 and a saturated unit weight of 17.8 kN/m^3. The watertable is located 4m below the ground surface.a. What is the effective stress at the bottom of the layer?What is the effective stress at the bottom of the layer if the watertable goes up by 3m?c. What is the effective stress at the bottom of the layer if the watertable goes up by 4m?Noto:Yaui

To Find :- Effective stress at bottom of clay layer

Answered: A 6m thick homogeneous soil layer has a…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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A 2 m thick clay is singly drained. A structure founded on the surface applied an average stress increase of 50 kPa to this clay layer. A piezometer is installed at the mid-depth of the clay layer. A. What would you expect the initial excess pore pressure reading on the piezometer to be immediately after application of load? B. C. The piezometer recorded a pore pressure of 25 kPa, 1-yr after the application of the stress. What would you expect it to read 2 years later? What is the coefficient of consolidation of this clay in cm²/s?
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PROBLEM 2 (15 points): The magnitude of stresses of the soil element represented by the figure below are oz = 250 kN and t= 80 kN m² Oy = 180- , and 0 = 25°, determine the following: m2 a. Magnitudes of the principal stresses. b. Normal stress on plane AB. c. Shear stress on plane AB. B A
A deposit of clay is underlain a layer of dry sand. The clay layer is 3 m thick, void ratio = 0.67, Gs = 2.75. The sand is 4 m thick, void ratio = 0.51, Gs = 2.65. The ground water table is permanently located at the interface between sand and clay layer. Compute the vertical effective stress at the bottom of the clay layer.
The total normal stress in a saturated soil mass is 295 kN / m2 , gap water pressure is 120 kN / m2 shear in terms of effective stresses in a plane measured as Calculate its strength. Effective tensile strength parameters for soil c '= 14 kN / m2 and φ'=28 degree.
Determine the following A. At the top layer what is the dry density B. Total stress @ point D C. Effective stress @ point b D. Effective stress @ point c
The ground water level in a thick very fine sand deposit is located 1.20 meters below the ground surface. Above the free water line the sand is saturated by capillary action. The unit weight of the saturated sand is 21.7 kN per cubic meter, determine the effective stress located 3.60 meters below the ground surface
A soil profile consisting of three layers is shown in Table and Figure below i. Calculate the values of σ, u and σʹ at points A, B, C, and D. ii. Calculate the effective stress at c when water table drops by 1 m (consider γb= 15.5 for layer 2). iii. Calculate the effective stress at c when water table rises by 1 m above layer 1 due to flooding. (consider γsat= 16.5 for layer 1). Layer no. Thickness Soil parameters 1 H1 = 3.5 m γd = 15.5 kN/m3 2 H2 = 2.5 m γsat = 18 kN/m3 3 H3 = 3 m γsat = 18.5 kN/m3
Calculate the change in total vertical normal stress(σ)and in effective stress(σ′)at a depth of10 m. in a saturated clay layer if the water table is dropped from the ground surface to a depth of20 m. below the ground surface. The clay has a water content of35%, S=100%andGs=2.75. Assume that no change in degree of saturation or water content occurs when the water table is lowered. Please type answer no write by hend.
oz is the vertical stress at a depth equal to Z in the soil mass due to a surface point load Q. The vertical stress at depth equal to 2 Z will be 1. 0.25 oz 2. 0.50 oz 3. 1.0 oz 4. 2.0 Oz
Plot the stress profile for total stress, effective stress and pore water pressure. Show all calculation A Diy sand 0,61 2.66 41 Salurated sand, =0.48° 2.67 Clay
Q.1 Top layer of a soil deposit consists of a clay layer of 4 m thickness overlaying a very thick layer of sand. Even though the water table is at middle of clay layer, the clay soil above the water table is saturated. The water content of clay strata is 30% while that of sand strata is 26%. If the specific gravity of clay and sand are 2.72 and 2.64 respectively. Calculate the total stress, pore water pressure and effective stress at a depth of 8 m from ground surface.

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