ulate the effective stress at point C. high should the water table rise so that the effective stress at C is 200 k Dry sand Yory-165 kN/m Groundwater table Saturated sand 7-19.25 AN 13m Dry sand Sanested sand Clay

ulate the effective stress at point C. high should the water table rise so that the effective stress at C is 200 k Dry sand Yory-165 kN/m Groundwater table Saturated sand 7-19.25 AN 13m Dry sand Sanested sand Clay

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter12: Shear Strength Of Soil

Section: Chapter Questions

Problem 12.18P

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1. A soil profile is shown in Figure below. Calculate the total stress, pore water pressure, and effective stress at points A and D. Dry sand G.-2.68 *»0.6 2 m 2m Groundwater table Clay G₁-2.72 e-09
1. (30 pts) The soil profile shown below consists of 10 meters of sandy silt overlying gravel. The pore water pressure at the top surface of the silty sand is zero and can be assumed to remain zero. a) Calculate the level to which water would rise in a piezometer tube inserted into the top of the gravel if the silty sand is just stable? Use submerged unit weights and seepage forces to arrive at your answer (do not calculate total stresses and pore water pressures). Express your answer as an elevation, e.g. "Elev. 130". (Note: Elevations are in meters) (10 pts) b) Using the piezometric elevation calculated in part (a), calculate the pore water pressure at the bottom of the silty sand if the silty sand is just stable (10 pts). c) Calculate the total stress at the base of the silty sand and show that it is equal to the pore water pressure calculated in part (b) (10 pts) Elev. 120 m. Elev. 110 m. Sandy Silt (saturated) Void ratio, e = 0.68 G = 2.65 Gravel
A glass container with pervious bottom containing fine sand in loose state (void ratio = 0.8) is subjected to hydrostatic pressure from underneath until quick condition occurs in the sand. If the specific gravity of sand particles = 2.65, area of cross-section of sand sample= 10 cm2 and height of sample = 10 cm, compute the seepage force in N acting from below. a. 9.17. b. 0.9 c. 0.45 d 7.29
In the deposit shown in the accompanying figure the groundwater level was originally at the ground surface. The water table was lowered by drainage to a depth of 25 ft., whereupon the degree of saturation of the sand above the lowered water table decreased to 20 percent. 1. What is the effective vertical stress at the mid height of the clay layer before lowering the water table? a. 4350 psf b. 4560 psf c. 3500 psf d. 6400 psf 2. What is the effective vertical stress at the mid height of the clay layer after lowering the water table? a. 4343 psf b. 4557 psf c. 5530 psf d. 6452 psf 3. What is the effective vertical stress at the mid height of the clay layer after lowering the water table to a depth of 50 ft? a. 5580 psf b. 6710 psf c. 3680 psf d. 5860 psf
3.15 In a site consisting of normally consolidated clean sands, the water table is at 10 ft depth. The average unit weight of the sand above and below the water table is 111.5 lb/ft3 and 125.0 lb/ft3, respectively. At a 25 ft depth, Nso was reported as 26. Determine the following: a. (N160 using Liao and Whitman's (1986) equation for CN [Eq. (3.13)] b. D, using Skempton's (1986) correlation [Eq. (3.28)] c. Friction angle using Schmertmann's (1975) correlation [Eq. (3.30)] d. Modulus of elasticity using Kulhawy and Mayne's (1990) correlation [Eq. (3.32)]
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.
2. Figure 2 shows the Total and Effective Stress Diagram of a soil profile Total Stress (KN/m) Effective Stress (kN/m) 150 200 100 150 200 42 42 56 56 86 66 10 154 94 Gambar 2Tegangan Total dan Diogram Tegangan Efektif a. Based on the diagram, what is the groundwater level? b. If the unit weight of water is 10 kN/m 3 , what is the unit weight of the saturated layer between 4 and 6 m deep? (u) yudag
. A soil profile is shown in figure below. Dry sand Yay- 165 KNm 6m Groundwater table Saturated sand 13m Yu 19.25 kN/m" 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.
Consider point P. If the groundwater drops 1m to the top of the clay layer, what would the change in Total Stress and Pore Water Pressure change? 1 m 1m 2m 2m P Sand Clay Sand Pd = 1.35 Mg/m³ Psat 1.85 Mg/m³ H Psat = 2.0 Mg/m³ Psat = 1.9 Mg/m³
viruses Unless you need to edit, it's sater to stay in riooutu VIum 11 Example The soil profile is shown below. Plot effective stress, total stress and pore pressure with depth for the entire profile. The soil profile is shown below. What are the total stresses effective stresses at point A WAYAYT. WAYINA P = 2.70 Mg/m3 2 m Sand n= 0.5 2 m Psat = 2.0 Mg/m3 4 m Clay A Activate Window Go to Settings to activat ||
stion 17 | Dry Sand H Groundwater Table Clay Refer to the soil profile shown. Given H1 = 8.93 m., and H2 = 5.32 m. If the ground water table rises by 2.01 meters, determine the change in effective stress (numerical value only, in kPa) at the bottom of the clay layer. Properties of dry sand: Gs = 2.56, e = 0.65. Properties of clay: Gs = 2.72, e = 0.87. Round off to two decimal places.
As shown in the figure given below, a 5 m thick layer of silty sand overlies a clay layer 3 m in thickness. Below the clay layer, there lies a 4 m thick gravelly sand layer underlain by pervious bedrock. The ground water table is at the ground surface. GWT Silty Sand 5 m Ya = 18 kN/m³ Ys = 19 kN/m3 Clay 1.5 m 3 m Ys = 18 kN/m3 x A Gravelly Sand Ys = 20 kN/m3 2 m 4 m x B WXXX a) Calculate the total stress (0), pore water pressure (u) and effective stress (o') at points "A" and “B". Show your work and tabulate the results in the following form. Point A Point B o (kPa) u (kPa) o' (kPa) b) If ground water table is lowered by 2 m for foundation excavation purposes, calculate the total stress, pore water pressure and effective stress at points "A" and "B" (i) immediately after, (ii) long time after lowering the water table. Show your work and tabulate the results in the following form.