EFFECTIVE STRESSCONCEPTSITUATION 1:A saturated clay 15 m thick has a voidratio of 0.6 anda specific gravity of 2.7.5. Which of the following gives thesaturated unit weight of clay?a. 18.95 kN/m?C. 20.23 kN/m?b. 19.18 kN/m?d. 24.22 kN/m?6. Which of the following gives thetotal vertical stress at the bottom?a. 303.45 kPaC. 355.66 kPab. 295.66 kPad. 145.67 kPa7. Which of the following gives theeffective vertical stress at the bottom?a. 197.33 kPac. 177.21 kPab. 187.95 kPad. 156.34 kPa

Answered: CONCEPT SITUATION 1: A saturated clay…

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter10: Stresses In A Soil Mass

Section: Chapter Questions

Problem 10.9P: For the same line loads given in Problem 10.8, determine the vertical stress increase, z, at a point...

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A granular soil deposit is 4 m. thick and underlying it is a clay having a thickness of 5 m. There is a water table at the interface of the soil and the clay. Unit weight of sand is 15.6 kN/m and saturated unit weight of clay is 17.8 kN/m. O What is the effective stress at the bottom of the clay? O If the water table rises to the level of the soil surface, what is the effective stress at the bottom of the clay? O f the water is 3 m. above the soil surface, what is the effective stress at the bottom of the clay?
Problem 1 A ground profile consists of 2 m of silty sand underlain by 3 m of clay. The ground water table is 3 m below the ground surface. The sand has a unit weight of 14 kN/m3. The clay has unit weight of 16 kN/m3 above the water table and 20 kN/m3 below the water table. a. Determine the total stress at bottom of the clay b. Determine the pore water pressure at the bottom of the clay c. Determine the effective stress at the bottom of the clay Problem 2 50 ft thick sand is underlain by 25 ft clay. The ground water table, initially at the ground surface, was lowered to a depth of 25 ft below the ground. After such lowering, the degree of saturation of the sand above water table was lowered to 20%. Saturated and dry unit weight of sand are 135 pcf and 116 pcf respectively. The saturated unit weight of clay is 120 pcf. a. What is the vertical effective pressure at the midheight of the clay layer before lowering of the water table in psf? b. What is the vertical effective pressure at the…
For the same line loads given in Problem 10.8, determine the vertical stress increase, z, at a point located 4 m below the line load, q2. Refer to Figure 10.41. Determine the vertical stress increase, z, at point A with the following values: q1 = 110 kN/m, q2 = 440 kN/m, x1 = 6 m, x2 = 3 m, and z = 4 m. Figure 10.41
Repeat Problem 10.12 for q = 700 kN/m2, B = 8 m, and z = 4 m. In this case, point A is located below the centerline under the strip load. 10.12 Refer to Figure 10.43. A strip load of q = 1450 lb/ft2 is applied over a width with B = 48 ft. Determine the increase in vertical stress at point A located z = 21 ft below the surface. Given x = 28.8 ft. Figure 10.43
A Dry sand 6m Ydry = 16.5 kN/m³ B Groundwater table Saturated sand Ysat = 19.25 kN/m³ 13m Dry sand Saturated sand Clay 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.
a sand layer 9 meters highoverlies a clay layer that is 5 meters high. ground water table is at the onterface of sand and clay. the unit weight of sand is 17.47kN/m^3, saturated unit weight of clay is 19.84kN/m^3, void ratio of clay is 0.52, LL=43. Determine the settlement in mm of the consolidating layer for a stress increase of 54.76 kPa.
From the given Figure, determine the following: a. Effective stress at the bottom of the clay b. if the water table rises to the level of the soil surface, what is the effective stress at the bottom of the clay. c. if the water is 3m above the soil surface, what is the effective stress at the bottom of the clay. 4m 5m 156 kN/m² 16.6 kN/m² Water table Y = 17,8 kN/m
A. Compute the effective stress at the bottom of the clay. B. If the water table rises to the level of the soil surface, what is the effective stress at the bottom of the clay? Fground surface Y-15.6 kN/m Yrar-16.6 KN/m3 4 m water table Clay 5 m:
A consolidated-drained tri-axial test was conducted on a normally consolidated clay. The results are as follows: O3 = 150 kN/m? (Aoa)f= 130 kN/m? Determine a. Angle of friction, o' b. Angle 0 that the failure plane makes with the major principal plane c. Find the normal stress o' and the shear stress tf on the failure plane d. Determine the effective normal stress on the plane of maximum shear stress
IV. A soil element is shown in Figure 3. (use equations) 130 kN/m² +35kN/m² 30⁰ 60 kN/m² 10 11. 12 + + B SITY FICAT 35 kN/m² Figure 3 What is the value of the maximum stress in kPa? What is the value of the normal stress acting at the plane AB in kPa? What is the value of the shear stress acting at the plane AB in kPa?
B) For the soil profile shown in Fig. (2), determine 1- The effective and total stress at point A. 2- The effective and total stress at point B. 3- The effective and total stress at point C. Fig.2 5.0m 4.0 m 6.0 m Sand G=2.67 e 0.78, S,= 25% A.V Clay G=2.75 e=0.69 B Clay Ysat 19 kN/m²
Problem 6 From the soil profile shown, 4.6 m Ground water table Clay e = 0.9 3.6m Gs = 2.75 1. Compute the effective stress at the bottom of the clay. 2. If the water table rises to the top of the ground surface, what is the change in the effective stress at the bottom of the clay layer? 3. How many meters must the ground water table rise to decrease the effective stress by 14.4 kPa at the bottom of the clay? Ground surface Dry Sand e = 0.49 Gs = 2.68

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